Realized gains on AFS securities AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] Restricted Stock Units Restricted Stock Units [Abstract] Restricted Stock Units Letters of credit Letter of Credit [Member] CET1 capital Banking Regulation, Common Equity Tier One Risk-Based Capital, Actual Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Consolidated Entities [Axis] Consolidated Entities [Axis] Vested (in dollars per share) Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other than Options Exercisable Weighted Average Grant Date Fair Value This element represents share based compensation arrangement by share based payment award equity instruments other than options exercisable weighted average grant date fair value. Premium amortization expense excluded from assessment of hedge effectiveness Loss from Components Excluded from Assessment of Cash Flow Hedge Effectiveness Preferred stock outstanding (in shares) Preferred Stock, Shares Outstanding Mortgage banking - loan commitment Mortgage Banking Loan Commitment [Member] Represents information of mortgage banking - loan commitment. Receivable Type [Axis] Receivable Type [Axis] Merger-related and other charges Merger-related and other charges Business Combination, Acquisition Related Costs Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Derivative financial instruments Derivative Liability Common stock dividends Dividends, Common Stock, Cash Security Exchange Name Security Exchange Name Equity securities with readily available fair values Equity Securities, FV-NI, Current Cancelled (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Cancelled (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Preferred stock dividends Dividends, Preferred Stock Community First Capital Trust II Community First Capital Trust Two [Member] Community First Capital Trust Two Total other comprehensive loss, Before-tax Amount Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Service charges and other related fees Noninterest Income, Other Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Additional awards remaining available under plan (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Deferred compensation plan liability Deferred Compensation Liability, Current and Noncurrent Net change in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Economic hedge, not designated as hedging instrument Not Designated as Hedging Instrument, Economic Hedge [Member] Liabilities: Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Exercised during period, Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Fair value adjustments included in earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Derivatives not designated as hedging instruments Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value Schedule of reclassifications out of AOCI Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] HTM, Fair Value, More than 10 years Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value Investment securities, including tax exempt of $2,655 and $2,150, respectively Interest and Dividend Income, Securities, Operating Fair value hedging Fair Value Hedging [Member] Fair value hedge of brokered time deposits Brokered Certificate Of Deposit [Member] Represents the brokered certificate of deposits. Amortization of intangibles Amortization of Intangible Assets Expected useful life of acquired intangible (in years) Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Potentially dilutive instruments outstanding not included in EPS analysis (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Subsequent Events [Abstract] Subsequent Events [Abstract] Business Combination and Asset Acquisition [Abstract] Business Acquisition [Axis] Business Acquisition [Axis] Cash flow hedging Cash Flow Hedging [Member] Loans held for sale Financing Receivable, Held-for-Sale Fair value adjustments included in earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Aggregate Intrinsic Value, Outstanding Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding Award Type [Domain] Award Type [Domain] Loans Past Due, over 90 Days Financial Asset, Equal to or Greater than 90 Days Past Due [Member] Estimated Aggregate Amortization Expense For Future Periods Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Fair value Business Combination, Acquired Receivable, Fair Value Local Phone Number Local Phone Number Securities Debt Securities, Available-for-Sale and Held-to-Maturity, after Allowance for Credit Loss Nonrecurring Fair Value, Nonrecurring [Member] Exercisable (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Additions Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances Schedule of amortized cost and fair value of AFS and HTM securities by contractual maturity Investments Classified by Contractual Maturity Date [Table Text Block] Originated four years prior Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] Entity Listings [Line Items] Entity Listings [Line Items] Intangible asset acquired Finite-lived Intangible Assets Acquired Four Oaks Statutory Trust I Four Oaks Statutory Trust I [Member] Represents information about Four Oaks Statutory Trust I. Retained Earnings Retained Earnings [Member] Mortgage loan revenue Mortgage Loan Revenue [Member] Information of mortgage loan revenue. Total deposits Deposits Deposits Interest expense: Interest Expense [Abstract] Financing Receivable, Past Due [Line Items] Financing Receivable, Past Due [Line Items] Non-credit discount Financing Receivable, Purchased with Credit Deterioration, Discount (Premium) Schedule of AFS debt securities in an unrealized loss position Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block] HTM debt securities Fair Value Fair value Debt Securities, Held-to-maturity, Fair Value Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Other liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other Loans receivable Loans Receivable [Member] Mortgage banking - forward sales commitment Mortgage Banking Forward Sales Commitment [Member] Represents mortgage banking - forward sales commitment. Basic (in dollars per share) Earnings Per Share, Basic AFS, Amortized Cost, 5 to 10 years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Amortized Cost Loans Past Due, 30 - 59 Days Financial Asset, 30 to 59 Days Past Due [Member] Fair Value, 12 Months or More Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value Loans and leases, net Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss Net cash received in acquisition Cash Acquired from Acquisition Outstanding, beginning balance (in shares) Outstanding, ending balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Beginning balance Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Schedule of contractual amount of off-balance sheet instruments Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block] Other Other expense Other Noninterest Expense Fair Value Measurement [Domain] Fair Value Measurement [Domain] Debt Securities, Available For Sale And Held To Maturity [Line Items] Debt Securities, Available For Sale And Held To Maturity [Line Items] Debt Securities, Available For Sale And Held To Maturity [Line Items] Total capital, Well-Capitalized Banking Regulation, Total Risk-Based Capital Ratio, Well Capitalized, Minimum Schedule of loans modified under the terms of a TDR, including TDR loans that defaulted Financing Receivable, Troubled Debt Restructuring [Table Text Block] Pass Pass [Member] Total gross derivative instruments Derivative Asset, Fair Value, Gross Asset Unrealized holding gains on derivatives, Before-tax Amount Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax Deferred compensation plan assets Deferred Compensation Plan Assets Estimated loss rate Measurement Input, Estimated Loss Rate [Member] Measurement Input, Estimated Loss Rate Residential MBS, Agency & GSEs Residential Mortgage-Backed Securities, Issued By US Government Sponsored Enterprises [Member] Debt securities collateralized by residential real estate mortgage loans (mortgages), issued by US Government Sponsored Enterprises, such as Federal Home Loan Mortgage Corporation (FHLMC or Freddie Mac). Liabilities assumed Noncash or Part Noncash Acquisition, Value of Liabilities Assumed Consumer Consumer Portfolio Segment [Member] Acquisitions: Noncash or Part Noncash Acquisitions [Abstract] Noncash or Part Noncash Acquisitions Assets: Assets, Fair Value Disclosure [Abstract] Long-term debt Total long-term debt Long-term Debt Level 1 Fair Value, Inputs, Level 1 [Member] Investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Pledged Status [Domain] Pledged Status [Domain] Schedule of loans by aging category and accrual status Financing Receivable, Past Due [Table Text Block] Reclassification of securities from available-for-sale to held-to-maturity, Tax (Expense) Benefit Other​ Comprehensive​ Income​ (Loss), ​Unrealized Gain (Loss), Transfers To Held To Maturity, Tax Other​ Comprehensive​ Income​ (Loss), ​Unrealized Gain (Loss), Transfers To Held To Maturity, Tax Sales and settlements Fair Value Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales And Settlements Fair Value Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales And Settlements Entity Small Business Entity Small Business Schedule of balance and activity in the ACL by portfolio segment Financing Receivable, Allowance for Credit Loss [Table Text Block] Commitment for additional fund Commitment For Additional Fund Represents commitment for additional fund, not reflected on consolidated balance sheet. Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Fair Value, Total Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value Derivatives designated as hedging instruments Derivative Instruments in Hedges, Assets, at Fair Value Scenario [Axis] Scenario [Axis] Capital surplus Additional Paid in Capital LIABILITIES AND SHAREHOLDERS’ EQUITY Liabilities and Equity [Abstract] 2025 Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year Three Hedging Relationship [Domain] Hedging Relationship [Domain] Interest rate swaps Interest Rate Swap [Member] Schedule of HTM debt securities in an unrealized loss position Unrealized Gain Loss On Held To Maturity Securities [Table Text Block] Unrealized gain loss on held to maturity securities. Entity Interactive Data Current Entity Interactive Data Current Issue Date Debt Instrument Issue Year This element represents debt instrument issue year. Salaries and employee benefits expense Salaries And Employee Benefit Expense [Member] Salaries And Employee Benefit Expense 2026 Finite-Lived Intangible Asset, Expected Amortization, Year Four Core deposit intangible Core Deposits [Member] Initial direct costs Sales Type And Direct Financing Leases, Initial Direct Costs Sales Type And Direct Financing Leases, Initial Direct Costs Gross realized gains Debt Securities, Available-for-sale, Realized Gain Mortgage loan gains and other related fees Mortgage Banking [Member] Balance Sheet Location [Domain] Balance Sheet Location [Domain] United Community Bank Subsidiaries [Member] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Gross Unrealized Gains Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Entity Address, State or Province Entity Address, State or Province PCD loans: Financing Receivable, Purchased with Credit Deterioration, Amount at Purchase Price [Abstract] Impact of acquisitions Common stock issued and options converted Stock Issued During Period, Value, Acquisitions Receivable [Domain] Receivable [Domain] Nonrecurring Adjustment [Axis] Nonrecurring Adjustment [Axis] Beginning balance (shares) Ending balance (shares) Shares, Outstanding Exercisable (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Unrealized Loss, Total Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss Total ACL, Charge-Offs Financing Receivable Allowance For Credit Loss And Off-Balance Sheet Credit Loss Liability, Writeoff Financing Receivable Allowance For Credit Loss And Off-Balance Sheet Credit Loss Liability, Writeoff Outstanding, Weighted Average Remaining Term (in years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Derivative Instrument [Axis] Derivative Instrument [Axis] Other assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Document Transition Report Document Transition Report Common stock, $1 par value: 200,000,000 shares authorized, 106,025,210 and 89,349,826 shares issued and outstanding, respectively Common Stock, Value, Issued Recognition period for unrecognized compensation expense Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Outstanding, beginning balance (in dollars per share) Outstanding, ending balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Schedule of carrying amount and fair values for other financial instruments that are not measured at fair value on a recurring basis Fair Value, by Balance Sheet Grouping [Table Text Block] Commercial MBS Commercial Mortgage Backed Securities [Member] Residential mortgage servicing rights Residential Mortgage Servicing Rights [Member] Residential Mortgage Servicing Rights [Member] Bifurcated embedded derivatives and dealer offsets Bifurcated Embedded Derivatives And Dealer Offsets [Member] Bifurcated embedded derivatives and dealer offsets. AFS, Fair Value, Not due at single maturity Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value Acquisitions Business Combination Disclosure [Text Block] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Other Commitments [Table] Other Commitments [Table] Total loans sold Financing Receivable, Sale Schedule of restricted stock units and options outstanding and activity Share-based Payment Arrangement, Activity [Table Text Block] Net cash flow hedge activity, Tax (Expense) Benefit Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax Cash flow hedge of trust preferred securities Trust Preferred Securities Hedge [Member] Trust Preferred Securities Hedge Investment Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Legal Entity [Axis] Legal Entity [Axis] Restricted stock units (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements HTM, Amortized Cost, 1 to 5 years Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five Class of Stock [Axis] Class of Stock [Axis] Supplemental consolidated pro forma net income (loss) Business Acquisition, Pro Forma Net Income (Loss) Outstanding principal balance Mortgage Loans Held For Sale Outstanding Principal Balance Represents mortgage loans held for sale quantified by principal amount, the principle balance held at close of period. Merger-related costs Acquisition-related Costs [Member] Net interest revenue Interest Income (Expense), Net ACL Financing Receivable, Allowance for Credit Loss [Roll Forward] Post-Modification Amortized Cost by Type of Modification Financing Receivable, Troubled Debt Restructuring, Postmodification Schedule of reconciliation of assets measured at fair value on a recurring basis using significant unobservable inputs Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Entity [Domain] Entity [Domain] Common stock dividends (in dollars per share) Common Stock, Dividends, Per Share, Declared AFS, Amortized Cost, 1 to 5 years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Amortized Cost Assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] Goodwill and other intangible assets Intangible Assets, Net (Including Goodwill) [Abstract] Loans and Leases and Allowance for Credit Losses Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Stock options Share-based Payment Arrangement, Option [Member] Equity [Abstract] Equity [Abstract] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Document Quarterly Report Document Quarterly Report Comprehensive income (loss), Tax (Expense) Benefit Comprehensive Income Loss Tax Represents amount of comprehensive income loss tax. Financing Receivable, Troubled Debt Restructuring [Table] Financing Receivable, Troubled Debt Restructuring [Table] Measurement Input Type [Domain] Measurement Input Type [Domain] Fair Value, Less than 12 Months Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months Variable Rate [Axis] Variable Rate [Axis] Leverage ratio, Minimum Banking Regulation, Tier One Leverage Capital Ratio, Capital Adequacy, Minimum TDRs Financing Receivable, Troubled Debt Restructuring Deposits Deposits [Member] Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-sale [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Document Fiscal Year Focus Document Fiscal Year Focus Variable Rate [Domain] Variable Rate [Domain] Equity investments, outflows Payments to Acquire Other Investments Transfers from Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Capital Surplus Additional Paid-in Capital [Member] Average total assets for the leverage ratio Regulatory Assets Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Actual revenue included since acquisition date Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual Debt securities held-to-maturity (fair value $2,351,873 and $1,148,804, respectively) Amortized Cost Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss Regulatory Matters Regulatory Capital Requirements under Banking Regulations [Text Block] Long-term debt Long-term Debt, Fair Value Mortgage Loans Held for Sale Mortgage Loans Held For Sale [Abstract] Mortgage Loans Held For Sale Maximum Maximum [Member] Share-based Payment Arrangement [Abstract] Share-based Payment Arrangement [Abstract] Prepayment rate Measurement Input, Prepayment Rate [Member] Servicing rights for SBA/USDA loans Servicing Asset at Fair Value, Amount Award Type [Axis] Award Type [Axis] Equity investments, inflows Proceeds From Other Investments Proceeds From Other Investments Financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Total shareholders' equity Beginning balance Ending balance Stockholders' Equity Attributable to Parent Service charges and fees Deposit Account [Member] City Area Code City Area Code Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Table] Security deposits Sales Type And Direct Financing Leases, Security Deposits Sales Type And Direct Financing Leases, Security Deposits Exercisable, Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Supplemental schedule of noncash investing and financing activities Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Designated as hedging instrument Designated as Hedging Instrument [Member] Comprehensive income (loss), Before-tax Amount Comprehensive Income Loss Before Tax Represents amount of comprehensive income (loss) before tax. Cash flow hedge of subordinated debt Interest Rate Contract. Subordinated Debt [Member] Interest Rate Contract. Subordinated Debt Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Impact of other United sponsored equity plans (in shares) Stock Issued During Period, Shares, Dividend Reinvestment Plan, Employee Benefit Plans, And Deferred Compensation Stock Issued During Period, Shares, Dividend Reinvestment Plan, Employee Benefit Plans, And Deferred Compensation CET1 capital, Well-Capitalized Banking Regulation, Common Equity Tier One Risk-Based Capital Ratio, Well Capitalized, Minimum Gross Unrealized Gains Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain Shareholders' equity: Stockholders' Equity Attributable to Parent [Abstract] AFS, Fair Value, 1 to 5 years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value 2023 Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year One Assets under management Assets under Management, Carrying Amount United Community Banks Inc, Holding Company United Community Banks Inc, Holding Company [Member] United Community Banks Inc, Holding Company Equipment financing Equipment financing receivables Equipment Financing [Member] Represents information related to equipment financing. 2029 subordinated debentures Two Thousand Twenty Nine Subordinated Debentures [Member] Two Thousand Twenty Nine Subordinated Debentures Income tax benefit related to expense for share-based awards Share-based Payment Arrangement, Expense, Tax Benefit Derivative Asset Derivative Asset [Abstract] Debt Security Category [Domain] Other than Temporary Impairment, Credit Losses Recognized in Earnings, Categories of Investments [Domain] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Restricted Stock Units Restricted stock units Restricted Stock Units (RSUs) [Member] Derivatives not designated as hedging instruments Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value Schedule of purchased assets and assumed liabilities Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Business Acquisition [Line Items] Business Acquisition [Line Items] AFS, Amortized Cost, More than 10 years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost Income Statement [Abstract] Income Statement [Abstract] Entity Registrant Name Entity Registrant Name Asset Class [Domain] Asset Class [Domain] Loan Restructuring Modification [Axis] Loan Restructuring Modification [Axis] Nonaccrual Loans Nonaccrual loans Financing Receivable, Nonaccrual Loans held for investment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables Basis of Presentation Basis of Presentation and Significant Accounting Policies [Text Block] Cancelled (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Income tax expense Net income, Tax (Expense) Benefit Income tax benefit Income Tax Expense (Benefit) Loans held for sale Increase (Decrease) in Loans Held-for-sale Entity Tax Identification Number Entity Tax Identification Number Document Fiscal Period Focus Document Fiscal Period Focus Cancelled (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Reclassification of losses on derivative instruments realized in net income, Net of Tax Amount Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Debt securities held-to-maturity: Debt Securities Held To Maturity [Abstract] Debt Securities Held To Maturity [Abstract] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Options converted Business Combination, Consideration Transferred, Converted Stock Options Business Combination, Consideration Transferred, Converted Stock Options Earnings allocated to participating securities Undistributed Earnings (Loss) Allocated to Participating Securities, Basic Derivative Instruments [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Substandard Substandard [Member] Equity Component [Domain] Equity Component [Domain] Financing Receivable, Allowance for Credit Loss [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Reclassification of securities from available-for-sale to held-to-maturity, Before-tax Amount Other​ Comprehensive​ Income​ (Loss), ​Unrealized Gain (Loss), Transfers To Held To Maturity, Before Tax Other​ Comprehensive​ Income​ (Loss), ​Unrealized Gain (Loss), Transfers To Held To Maturity, Before Tax Customer derivatives and dealer offsets Customer Derivatives And Dealer Offsets [Member] Information of Customer Derivatives And Dealer Offsets. HELOC Home Equity Line of Credit [Member] Common stock issued in acquisition Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Unrealized holding gains on derivatives, Net of Tax Amount Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Structure Extended Maturity [Member] Impact of acquisitions (in shares) Stock Issued During Period, Shares, Acquisitions Additions Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances Liabilities: Liabilities [Abstract] Reclassification of securities from available-for-sale to held-to-maturity, Net of Tax Amount Other​ Comprehensive​ Income​ (Loss), ​Reclassification ​Adjustment, ​Available For Sale To Held To Maturity, After Tax Other​ Comprehensive​ Income​ (Loss), ​Reclassification ​Adjustment, ​Available For Sale To Held To Maturity, After Tax Weighted Average Weighted Average [Member] Income before income taxes Net income, Before-tax Amount Total before tax Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Level 2 Fair Value, Inputs, Level 2 [Member] Schedule of carrying amount of goodwill and other intangible assets Schedule of Intangible Assets and Goodwill [Table Text Block] Restricted stock units and performance stock units Restricted Stock Units RSU And Performance Stock Units [Member] Restricted Stock Units RSU And Performance Stock Units Amount of Gain (Loss) Recognized in Income on Derivatives Derivative, Gain (Loss) on Derivative, Net Fair Value, Total Debt Securities, Available-for-sale, Unrealized Loss Position Financing Receivable, Credit Quality Indicator [Line Items] Financing Receivable, Credit Quality Indicator [Line Items] Schedule of computation of basic and diluted earnings per share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Investment securities, tax exempt Interest Income, Securities, Operating, Tax Exempt Tier 1 capital, Minimum Banking Regulation, Tier One Risk-Based Capital Ratio, Capital Adequacy, Minimum Total other comprehensive loss, Net of Tax Amount Other comprehensive loss Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Schedule of presentation of assets measured at fair value on nonrecurring basis Fair Value Measurements, Nonrecurring [Table Text Block] Total ACL, Beginning Balance Total ACL, Ending Balance Financing Receivable, Allowance For Credit Loss, Excluding Accrued Interest And Off-Balance Sheet Credit Loss Liability Financing Receivable, Allowance For Credit Loss, Excluding Accrued Interest And Off-Balance Sheet Credit Loss Liability Title of 12(b) Security Title of 12(b) Security Schedule of loans held for sale at fair value under the fair value option Fair Value Option, Disclosures [Table Text Block] Securities losses, net Realized Investment Gains (Losses) AFS, Amortized Cost, Not due at single maturity Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost Common stock authorized (in shares) Common Stock, Shares Authorized Loans held for sale Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Loans Held For Sale Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Loans Held For Sale Net income available to common shareholders, diluted Net Income (Loss) Available to Common Stockholders, Diluted Title of Individual [Axis] Title of Individual [Axis] Net income available to common shareholders, basic Net income available to common shareholders, basic Net Income (Loss) Available to Common Stockholders, Basic Document Type Document Type Product and Service [Domain] Product and Service [Domain] Interest Rate (percent) Debt Instrument, Interest Rate, Stated Percentage Schedule of components of net investment in leases Schedule Of Components Of Net Investment In Lease, Sales Type And Direct Financing Leases [Table Text Block] Schedule Of Components Of Net Investment In Lease, Sales Type And Direct Financing Leases [Table Text Block] Net amount Derivative Asset, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election Reclassification adjustment for losses included in net income, Before-tax Amount Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Long-term debt Long-term debt interest expense Interest Expense, Long-term Debt Measurement Frequency [Axis] Measurement Frequency [Axis] Reclassification adjustment for losses included in net income, Net of Tax Amount Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Total noninterest income Noninterest Income Accrued expenses and other liabilities Accrued Liabilities and Other Liabilities Transfers from Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Interest-bearing deposits in banks Interest-bearing Deposits in Banks and Other Financial Institutions Hedging Relationship [Axis] Hedging Relationship [Axis] Total assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Interest expense Interest Expense [Member] Subsequent Events Subsequent Events [Text Block] Community First Capital Trust III Community First Capital Trust Three [Member] Community First Capital Trust Three Total ACL, Recoveries Financing Receivable Allowance For Credit Loss And Off-Balance Sheet Credit Loss Liability, Recovery Financing Receivable Allowance For Credit Loss And Off-Balance Sheet Credit Loss Liability, Recovery Goodwill expected to be tax deductible Business Acquisition, Goodwill, Expected Tax Deductible Amount Prior service cost Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Weighted average common shares outstanding: Weighted average shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Plan vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Lending and loan servicing fees Other Lending And Loan Servicing Fees Other Lending And Loan Servicing Fees Assets and Liabilities Measured at Fair Value Fair Value Disclosures [Text Block] TDRs Modified Within the Previous Twelve Months That Have Subsequently Defaulted, Recorded Investment Financing Receivable, Troubled Debt Restructuring, Subsequent Default Cash and due from banks Cash and Due from Banks 2025 Finite-Lived Intangible Asset, Expected Amortization, Year Three Special Mention Special Mention [Member] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] AFS Available-for-sale Securities [Member] Net cash flow hedge activity, Before-tax Amount Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax Interest revenue: Interest and Dividend Income, Operating [Abstract] Document Period End Date Document Period End Date ACL - unfunded commitments, Beginning Balance ACL - unfunded commitments, Ending Balance Off-Balance Sheet, Credit Loss, Liability Commercial & industrial Commercial And Industrial Classification [Member] Commercial And Industrial Classification[Member] Net unrealized losses, Net of Tax Amount OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax Consolidated Entities [Domain] Consolidated Entities [Domain] Options, Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Income Statement Location [Domain] Income Statement Location [Domain] Short-term borrowings Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Short Term Borrowings Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Short Term Borrowings Sales and settlements Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales And Settlements Amount of sale and settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Thereafter Finite-Lived Intangible Asset, Expected Amortization, After Year Four Finite-Lived Intangible Asset, Expected Amortization, After Year Four Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-sale [Table] Unrealized Loss, 12 Months or More Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Significant non-cash investing and financing transactions: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Risk-weighted assets Banking Regulation, Risk-Weighted Assets, Actual Accrued interest receivable Accrued interest receivable Interest Receivable Premises and equipment, net Property, Plant and Equipment, Net Mortgage loans held for sale Fair value Mortgages Held-for-sale, Fair Value Disclosure Fair value adjustments included in OCI Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Net income per common share: Earnings Per Share [Abstract] Earnings Per Share [Abstract] Repayment of long-term debt Repayments of Other Long-term Debt Cash and cash equivalents Cash, Cash Equivalents, and Federal Funds Sold Total revenue Revenues Minimum future lease payments expected to be received Sales-type and Direct Financing Leases, Lease Receivable, Fiscal Year Maturity [Abstract] Other Commitments [Line Items] Other Commitments [Line Items] Beginning balance, outstanding (in dollars per share) Ending balance, outstanding (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Interest-bearing deposits Interest-bearing Deposit Liabilities Unrealized holding gains on derivatives, Tax (Expense) Benefit Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax Number of AFS debt securities in unrealized loss position Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions Guaranteed portion of SBA/USDA loans SBA USDA Guaranteed Loans [Member] SBA USDA Guaranteed Loans [Member] Debt Securities, Trading, and Equity Securities, FV-NI [Table] Debt Securities, Trading, and Equity Securities, FV-NI [Table] Entity Current Reporting Status Entity Current Reporting Status Weighted- Average Grant- Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Other Noninterest Income, Other Operating Income Supranational entities Other Debt Obligations [Member] Servicing rights for SBA/USDA loans, measurement input Servicing Asset, Measurement Input Proceeds from maturities and calls Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities Discount rate Measurement Input, Discount Rate [Member] Effect of hedging relationships on interest expense: Summary of Derivative Instruments Impact on Results of Operations [Abstract] Stated Maturity Date Debt Instruments Maturity Year This element represents debt instruments maturity year. Net increase in deposits Increase (Decrease) in Deposits Net investment in leases Net investment in leases Net Investment in Lease, before Allowance for Credit Loss Derivative instruments designated as cash flow hedges: Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax [Abstract] LIBOR London Interbank Offered Rate (LIBOR) [Member] Financing Receivable, Troubled Debt Restructuring [Line Items] Financing Receivable, Troubled Debt Restructuring [Line Items] Nonaccrual loans with an allowance Financing Receivable, Nonaccrual, With Allowance Amount of financing receivable on nonaccrual status with an allowance for credit loss. Total noninterest expenses Noninterest Expense Entity Address, Postal Zip Code Entity Address, Postal Zip Code HTM, Fair Value, 5 to 10 years Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Fair Value Diluted (in shares) Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Assets acquired Noncash or Part Noncash Acquisition, Value of Assets Acquired Less: Cash collateral received/pledged Derivative Asset, Fair Value of Collateral Basis spread on variable rate (spread) Debt Instrument, Basis Spread on Variable Rate AFS, Amortized Cost, Within 1 year Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost Schedule of nonaccrual loans by loan class Financing Receivable, Nonaccrual [Table Text Block] Owner occupied commercial real estate Owner Occupied Commercial Real Estate [Member] Represents information of owner occupied commercial real estate. Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Loans and leases, net Loans Receivable, Fair Value Disclosure Occupancy Occupancy, Net Not designated as hedging instrument Not Designated as Hedging Instrument [Member] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Entity Address, Address Line One Entity Address, Address Line One Other investing inflows Proceeds From Other Investing Activities Proceeds From Other Investing Activities Common stock issuable (in shares) Common Stock Issuable, Shares Represents number of shares of common stock issuable. Purchased loans Financial Asset Acquired with Credit Deterioration [Member] Operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Impact of other United sponsored equity plans Stock Issued During Period, Value, Dividend Reinvestment Plan, Employee Benefit Plans, And Deferred Compensation Stock Issued During Period, Value, Dividend Reinvestment Plan, Employee Benefit Plans, And Deferred Compensation Entity Shell Company Entity Shell Company Wealth management fees Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions Cash paid for shares withheld to cover payroll taxes related to equity instruments Payment, Tax Withholding, Share-based Payment Arrangement Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Schedule of minimum amounts required for capital adequacy purposes Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Reclassifications out of AOCI Reclassification out of Accumulated Other Comprehensive Income [Member] Cash and cash equivalents Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents Current Fiscal Year End Date Current Fiscal Year End Date Total loans Financing Receivable, before Allowance for Credit Loss Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Proceeds from FHLB advances Proceeds from FHLBank Borrowings, Financing Activities Reclassifications Out of AOCI Disclosure of Reclassification Amount [Text Block] Tidelands Statutory Trust I Tidelands Statutory Trust One [Member] Represents information of Tidelands statutory trust one. Originated two years prior Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year HTM, Amortized Cost, More than 10 years Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10 Statement [Table] Statement [Table] Recently Adopted Standards and Recently Issued Standards New Accounting Pronouncements, Policy [Policy Text Block] Unrecognized compensation expense Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Preferred stock, $1 par value: 10,000,000 shares authorized; 4,000 shares Series I issued and outstanding; $25,000 per share liquidation preference Preferred Stock, Including Additional Paid in Capital, Net of Discount Schedule of gains and losses recognized in income on derivatives not designated as hedging instruments Derivatives Not Designated as Hedging Instruments [Table Text Block] Number of HTM debt securities in unrealized loss position Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions Statistical Measurement [Axis] Statistical Measurement [Axis] Accrued interest receivable Interest Receivable and Other Assets [Abstract] Total intangibles subject to amortization, net Finite-Lived Intangible Assets, Net Goodwill Goodwill, beginning balance Goodwill, ending balance Goodwill Assets: Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] 2028 subordinated debentures Two Thousand Twenty Eight Subordinated Debentures [Member] Represents information of 2028 subordinated debentures. Unrealized Loss, Less than 12 Months Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Scenario [Domain] Scenario [Domain] Schedule of changes in the carrying amounts of goodwill Schedule of Goodwill [Table Text Block] Loans and leases held for investment Total loans Total loans Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss Pledging Purpose [Axis] Pledging Purpose [Axis] Pledging Purpose Gains from sales of other loans, net Gain (Loss) on Sales of Loans, Net Reclassifications related to defined benefit pension plan activity Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Entity Listings [Table] Entity Listings [Table] Maximum remaining maturity of financial instruments having no defined maturity Maximum Remaining Maturity Of Financial Instruments Having No Defined Maturity Maximum remaining maturity of financial instruments having no defined maturity. Schedule of loans held for investment sold Schedule Of Financing Receivables Sold, Loans [Table Text Block] Schedule Of Financing Receivables Sold, Loans Unrealized Loss, 12 Months or More Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Deferred income tax expense Deferred Income Tax Expense (Benefit) AFS, Amortized Cost Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract] Deposits Interest Expense, Deposits Assets: Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Net deferred tax asset Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Hedging Designation [Domain] Hedging Designation [Domain] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Total ACL, Initial ACL - PCD loans Financing Receivable Allowance For Credit Loss And Off-Balance Sheet Credit Loss Liability, Purchased With Credit Deterioration, Increase Financing Receivable Allowance For Credit Loss And Off-Balance Sheet Credit Loss Liability, Purchased With Credit Deterioration, Increase Net income Net income, Net of Tax Amount Net income Net Income (Loss) Attributable to Parent Tier 1 capital, Well-Capitalized Banking Regulation, Tier One Risk-Based Capital Ratio, Well Capitalized, Minimum Stock Options Stock Options [Abstract] Stock Options Noninterest-bearing demand Noninterest-bearing Deposit Liabilities Income Statement Location [Axis] Income Statement Location [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Less: accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Reclassification of securities from available-for-sale to held-to-maturity, Tax (Expense) Benefit Other​ Comprehensive​ Income​ (Loss), ​Reclassification ​Adjustment, ​Available For Sale To Held To Maturity, Tax Other​ Comprehensive​ Income​ (Loss), ​Reclassification ​Adjustment, ​Available For Sale To Held To Maturity, Tax Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Residential MBS, Non-agency Residential Mortgage-Backed Securities, Issued By Private Enterprises [Member] Debt securities collateralized by residential real estate mortgage loans (mortgages), issued by non-governmental sponsored enterprises. Proceeds from sales of premises and equipment Proceeds from Sale of Property, Plant, and Equipment HTM, Amortized Cost, Not due at single maturity Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date Unrealized Loss, Less than 12 Months Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss FDIC assessments and other regulatory charges Federal Deposit Insurance Corporation Premium Expense Entity File Number Entity File Number Depositary shares, each representing 1/1000th interest in a share of Series I Non-Cumulative Preferred Stock Depositary Share On UCBI Series I Non-Cumulative Preferred Stock [Member] Depositary Share On UCBI Series I Non-Cumulative Preferred Stock Schedule of amortized cost basis, unrealized gains and losses, and fair value of AFS debt securities Debt Securities, Available-for-sale [Table Text Block] Deposits in banks and short-term investments Federal Funds Sold Commercial Paper and Deposits In Banks Represents amount of federal funds sold, commercial paper and deposits in banks. AFS, Fair Value, More than 10 years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value Organization, Consolidation and Presentation of Financial Statements [Abstract] Bifurcated embedded derivatives Bifurcated Embedded Derivative [Member] Represents the bifurcated embedded derivatives. Unrealized gains (losses) on available-for-sale securities: OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax [Abstract] Net assets acquired Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed) Estimate of contractual cash flows not expected to be collected Business Combination, Acquired Receivables, Estimated Uncollectible Transfers of AFS securities to HTM securities Transfers of AFS debt securities to HTM Debt Securities, Held-To-Maturity Transferred From Available-For-Sale, Fair Value Debt Securities, Held-To-Maturity Transferred From Available-For-Sale, Fair Value Liability Class [Axis] Liability Class [Axis] 2030 senior debentures Two Thousand Thirty Senior Debentures [Member] Two Thousand Thirty Senior Debentures Schedule of amortized cost basis, unrealized gains and losses and fair value of HTM debt securities Debt Securities, Held-to-maturity [Table Text Block] Actual net income (loss) included since acquisition date Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual ACL - loans, (Release) Provision Financing Receivable, Credit Loss, Expense (Reversal) Granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value SOFR Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Title of Individual [Domain] Title of Individual [Domain] Corporate bonds, measurement input Debt Securities, Available-for-sale, Measurement Input Proceeds from maturities and calls Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale Unrealized losses on available-for-sale securities, Net of Tax Amount OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Net unrealized losses, Tax (Expense) Benefit OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax Customer derivative positions Customer Swap Position [Member] Represents the customer swap positions. Amortization of prior service cost and actuarial losses included in net periodic pension cost for defined benefit pension plan, Before-tax Amount Other Comprehensive Income Loss Amortization Of Prior Service Cost And Actuarial Losses Included In Net Periodic Pension Cost For Defined Benefit Pension Plan Before Tax Amount Represents amount of other comprehensive income (loss) amortization of prior service cost and actuarial losses included in net periodic pension cost for defined benefit pension plan, before tax amount. ASSETS Assets [Abstract] Proceeds from sale of other real estate and repossessed assets Proceeds from Sale of Other Real Estate Reclassification of securities from available-for-sale to held-to-maturity, Net of Tax Amount Other​ Comprehensive​ Income​ (Loss), ​Unrealized Gain (Loss), Transfers To Held To Maturity, After Tax Other​ Comprehensive​ Income​ (Loss), ​Unrealized Gain (Loss), Transfers To Held To Maturity, After Tax Accumulated impairment losses on goodwill Goodwill, Impaired, Accumulated Impairment Loss State and political subdivisions US States and Political Subdivisions Debt Securities [Member] Derivatives and Hedging Activities Derivative Instruments and Hedging Activities Disclosure [Text Block] Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Schedule of AFS securities sales activity Schedule of Realized Gain (Loss) [Table Text Block] Goodwill and Other Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Beginning balance, outstanding (in shares) Ending balance, outstanding (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number HTM Held-to-maturity Securities [Member] Debt Instrument [Axis] Debt Instrument [Axis] Revolvers Financing Receivable, Excluding Accrued Interest, Revolving AFS debt securities: Debt Securities, Available-for-sale [Abstract] Financial Asset, Aging [Domain] Financial Asset, Aging [Domain] Advertising and public relations Marketing and Advertising Expense Non-PCD loans: Business Combination, Acquired Receivables [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Employees Employee [Member] Employee Less: Amounts subject to master netting agreements Derivative Liability, Not Offset, Policy Election Deduction Less allowance for credit losses - loans and leases Less allowance for credit losses - loans ACL - loans, Beginning Balance ACL - loans, Ending Balance Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 2026 Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year Four Right-of-use assets obtained in exchange for lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Commercial MBS, Agency & GSEs Commercial Mortgage-Backed Securities, Issued By US Government Sponsored Enterprises [Member] Debt securities collateralized by commercial real estate mortgage loans (mortgages), issued by US Government Sponsored Enterprises, such as Federal Home Loan Mortgage Corporation (FHLMC or Freddie Mac). Fair value adjustments included in OCI Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Prime Rate Prime Rate [Member] Number of derivative contracts Number of Interest Rate Derivatives Held Gains to be reclassified from accumulated other comprehensive income into earnings over the next twelve months Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net Derivatives designated as hedging instruments Derivative Instruments in Hedges, Liabilities, at Fair Value Short-term borrowings Interest Expense, Other Short-term Borrowings Total loans Financing Receivable, 90 Days or More Past Due, Still Accruing Total identifiable net assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Fair value hedge Fair Value Hedge Liabilities TDRs Modified Within the Previous Twelve Months That Have Subsequently Defaulted, Number of Contracts Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts Residential mortgage servicing rights Residential Mortgage Servicing Asset At Fair Value, Amount Residential Mortgage Servicing Asset At Fair Value, Amount Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Core deposit intangible Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Other Other Type Of Modification [Member] Represents type of modification other not defined elsewhere. Dealer offsets to bifurcated embedded derivatives Dealer Offsets To Bifurcated Embedded Derivatives [Member] Represents the dealer offsets to bifurcated embedded derivatives. Investment in limited partnerships Investment In Limited Partnerships Represents investment in limited partnerships. Construction Construction Loans [Member] Debt Securities, Held-to-maturity [Table] Debt Securities, Held-to-maturity [Table] Manufactured housing Manufactured Housing Loan [Member] Manufactured Housing Loan Total fair value of consideration transferred Business Combination, Consideration Transferred Noninterest income: Noninterest Income [Abstract] Long-term debt, gross Long-term Debt, Gross Goodwill [Roll Forward] Goodwill [Roll Forward] Remainder of 2022 Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Remainder of Fiscal Year Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Total assets Assets, Fair Value Disclosure Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Net interest revenue after provision for credit losses Interest Income (Expense), after Provision for Loan Loss Liabilities: Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Total liabilities and shareholders' equity Liabilities and Equity Originated in prior year Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Mortgage banking derivatives Mortgage Banking Derivatives [Member] Information of Mortgage banking derivatives. Net cash flow hedge activity, Net of tax Amount Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Net unrealized losses, Before-tax Amount OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax Exercised (in dollars per shares) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price AFS, Fair Value, 5 to 10 years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Fair Value HTM, Amortized Cost, Within 1 year Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One Net amount Derivative Liability, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election Accrued interest receivable Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Assets, Accrued Interest Receivables Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Assets, Accrued Interest Receivables Derivative liabilities Derivative Liabilities Derivative Financial Instruments, Liabilities [Member] HTM debt securities: Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] Leverage ratio Banking Regulation, Tier One Leverage Capital Ratio, Actual Earnings Per Share Earnings Per Share [Text Block] Noninterest expenses: Operating Expenses [Abstract] Accounting Changes and Error Corrections [Abstract] Accounting Changes and Error Corrections [Abstract] Minimum Minimum [Member] Nonrecurring Adjustment [Domain] Nonrecurring Adjustment [Domain] Derivative assets - customer derivative positions Derivative Assets Customer Derivative Positions [Member] Derivative Assets Customer Derivative Positions Estimated residual value of leased equipment Sales Type And Direct Financing Leases, Unguaranteed Residual Asset Sales Type And Direct Financing Leases, Unguaranteed Residual Asset Total liabilities Financial and Nonfinancial Liabilities, Fair Value Disclosure Preferred stock authorized (in shares) Preferred Stock, Shares Authorized HTM, Amortized Cost Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity [Abstract] Fair Value, 12 Months or More Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer Earliest Call Date Debt Instrument Earliest Call Year This element represents debt instrument earliest call year. Schedule of additional information related to acquired loan portfolio Additional Information Related To Acquired Loan [Table Text Block] Tabular disclosure of the amounts recognized as additional information related to the acquired loan. Debt securities available-for-sale: Debt Securities Available-For-Sale And Equity Securities [Abstract] Debt Securities Available-For-Sale And Equity Securities [Abstract] Supplemental Cash Flow Information Cash Flow, Supplemental Disclosures [Text Block] ACL - unfunded commitments, (Release) Provision Off-Balance Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal) AFS, Fair Value, Within 1 year Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value Stock-Based Compensation Share-based Payment Arrangement [Text Block] SBA/USDA loan servicing rights SBA Servicing Rights [Member] Represents SBA servicing rights. Senior debentures Senior Notes [Member] Level 3 Fair Value, Inputs, Level 3 [Member] Cash dividends on common stock Payments of Ordinary Dividends, Common Stock Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Reclassification of securities from available-for-sale to held-to-maturity, Before-tax Amount Other​ Comprehensive​ Income​ (Loss), ​Reclassification ​Adjustment, ​Available For Sale To Held To Maturity, Before Tax Other​ Comprehensive​ Income​ (Loss), ​Reclassification ​Adjustment, ​Available For Sale To Held To Maturity, Before Tax Income producing commercial real estate Income Producing Commercial Real Estate [Member] Property that represents income producing commercial real estate. Acquisitions Goodwill, Acquired During Period Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Current Loans Financial Asset, Not Past Due [Member] Postage, printing and supplies Supplies and Postage Expense Subsequent Event [Table] Subsequent Event [Table] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Emerging Growth Company Entity Emerging Growth Company ACL- loans, Initial ACL - PCD loans Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase Allowance for credit losses, HTM portfolio Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest Receivables [Abstract] Receivables [Abstract] AFS, Fair Value Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract] Cover [Abstract] Cover [Abstract] CET1 capital, Minimum Banking Regulation, Common Equity Tier One Risk-Based Capital Ratio, Capital Adequacy, Minimum Net Investment in Leases Net Investment in Lease, before Allowance for Credit Loss [Abstract] Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Trust preferred securities Trust Preferred Securities [Member] Represents information of trust preferred securities. Pledged Status [Axis] Pledged Status [Axis] Unrealized losses on available-for-sale securities, Tax (Expense) Benefit OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax Financial Instrument [Axis] Financial Instrument [Axis] Common stock issued (in shares) Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Debt securities available-for-sale Fair Value Fair Value Debt Securities, Available-for-Sale, Excluding Accrued Interest Vested (in shares) Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other Than Options Exercisable Number This element represents share based compensation arrangement by share based payment award equity instruments other than option exercisable number. Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Reliant Reliant Bancorp, Inc [Member] Reliant Bancorp, Inc Carrying Amount Reported Value Measurement [Member] Gross Unrealized Losses Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss Derivative assets - mortgage Derivative Assets Mortgage [Member] Derivative Assets Mortgage Net increase in loans Payments for (Proceeds from) Loans and Leases Common stock, par value $1 per share Common Stock Common Stock [Member] Professional fees Professional Fees Gains from sales of other loans, net Gain (Loss) on Sale of Loans and Leases Financial Asset, Aging [Axis] Financial Asset, Aging [Axis] Gross Unrealized Losses Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 2024 Finite-Lived Intangible Asset, Expected Amortization, Year Two Hedging Designation [Axis] Hedging Designation [Axis] Securities losses, net Securities losses, net Debt Securities, Available-for-sale, Realized Gain (Loss) Stock based compensation Share-based Payment Arrangement, Noncash Expense Total other comprehensive loss, Tax (Expense) Benefit Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Net income (expense) recognized Gain (Loss) on Derivative Instruments, Net, Pretax Purchases Payments to Acquire Debt Securities, Available-for-sale Actuarial losses Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] Number of Contracts Financing Receivable, Modifications, Number of Contracts Less: Cash collateral received/pledged Derivative Liability, Fair Value of Collateral Notional Amount Derivative, Notional Amount Debt Security Category [Axis] Debt Security Category [Axis] Purchases of premises and equipment Payments to Acquire Property, Plant, and Equipment Dividends on preferred stock Preferred Stock Dividends, Income Statement Impact Repayment of FHLB advances Payments of FHLBank Borrowings, Financing Activities Reclassification adjustment for losses included in net income, Tax (Expense) Benefit Income tax benefit attributable to sales Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Total liabilities Liabilities Federal funds and other short-term investments Federal Funds Sold And Other Short-Term Investments Federal Funds Sold And Other Short-Term Investments Unearned income Sales Type And Direct Financing Leases, Deferred Selling Profit Sales Type And Direct Financing Leases, Deferred Selling Profit Pledging Purpose [Domain] Pledging Purpose [Domain] Pledging Purpose [Domain] Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] 2023 Finite-Lived Intangible Asset, Expected Amortization, Year One Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price 2027 senior debentures Two Thousand Twenty Seven Senior Debentures [Member] Represents information of 2027 senior debentures. Outstanding, Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Measurement Input Type [Axis] Measurement Input Type [Axis] Dealer offsets to customer derivative positions Dealer Offset To Customer Swap Position [Member] Represents the dealer offset to customer swap position. Common stock issued (in shares) Common Stock, Shares, Issued Preferred stock issued (in shares) Preferred Stock, Shares Issued HTM, Fair Value, Within 1 year Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value Entity Address, City or Town Entity Address, City or Town Gross realized losses Debt Securities, Available-for-sale, Realized Loss Residential mortgage Residential Mortgage [Member] Proceeds from issuance of common stock for dividend reinvestment and employee benefit plans Proceeds From Issuance Of Common Stock For Dividend Reinvestment and Employee Benefit Plans Represents amount of cash inflow from the amount received from the stock plan and capital contributions to an entity associated with a dividend reinvestment plan during the period. Balance Sheet Location [Axis] Balance Sheet Location [Axis] Measurement Frequency [Domain] Measurement Frequency [Domain] Loan Restructuring Modification [Domain] Loan Restructuring Modification [Domain] Total interest expense Total interest expense presented in the consolidated statements of income Interest Expense Total interest revenue Interest and Dividend Income, Operating Loans Past Due, 60 - 89 Days Financial Asset, 60 to 89 Days Past Due [Member] Community First Capital Trust I Community First Capital Trust One [Member] Community First Capital Trust One Retained earnings Retained Earnings (Accumulated Deficit) Plan exercisable period Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] ACL - loans, Recoveries Financing Receivable, Allowance for Credit Loss, Recovery Mortgage loans held for sale Mortgages Held-For-Sale, After Nonrecurring Fair Value Adjustment, Carrying Value Mortgages Held-For-Sale, After Nonrecurring Fair Value Adjustment, Carrying Value Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Entity Filer Category Entity Filer Category U.S. Treasuries US Treasury Securities [Member] Fair Value Estimate of Fair Value Measurement [Member] Schedule of reconciliation of liabilities measured at fair value on a recurring basis using significant unobservable inputs Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Lending and loan servicing expense Loan Portfolio Expense Accounting Standards Updates and Recently Adopted Standards Accounting Standards Update and Change in Accounting Principle [Text Block] Proceeds from exercise of stock options Proceeds from Stock Options Exercised Common stock issuable: 574,139 and 595,705 shares, respectively Common Stocks Issuable Represents amount of carrying amount of common stock issuable. Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Amendment Flag Amendment Flag Commercial Commercial Portfolio Segment [Member] Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss Equity Components [Axis] Equity Components [Axis] Derivative Assets Derivative Asset [Member] Represents Derivative Asset. 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loans, Charge-Offs Financing Receivable, Allowance for Credit Loss, Writeoff Loans held for investment Loans Held For Investment, After Nonrecurring Fair Value Adjustment, Carrying Value Loans Held For Investment, After Nonrecurring Fair Value Adjustment, Carrying Value Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Subsequent Event [Line Items] Subsequent Event [Line Items] Residential Residential Portfolio Segment [Member] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted (in dollars per share) Earnings Per Share, Diluted Residential mortgage servicing rights, measurement input Residential Mortgage Servicing Asset Measurement Input Residential Mortgage Servicing Asset, Measurement Input Number of banking branches Number of offices Number Of Branches Represents number of branches operated by entity. Schedule of estimated aggregate amortization expense for future periods Finite-lived Intangible Assets Amortization Expense [Table Text Block] Comprehensive income (loss), Net of Tax Amount Comprehensive Income (Loss), Net of Tax, Attributable to Parent Other comprehensive loss: Other Comprehensive Income (Loss), Net of Tax [Abstract] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Premises and equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Corporate bonds Corporate Bonds Corporate Debt Securities [Member] Less: Amounts subject to master netting agreements Derivative Asset, Not Offset, Policy Election Deduction Originated in current fiscal year Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year Schedule of assets and liabilities measured at fair value on a recurring basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Unrealized losses associated with AFS debt securities transferred to HTM Debt Securities, Held-To-Maturity Transferred From Available-For-Sale, Unrealized Gain (Loss) At Transfer Debt Securities, Held-To-Maturity Transferred From Available-For-Sale, Unrealized Gain (Loss) At Transfer Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Remainder of 2022 Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year Bank owned life insurance Bank Owned Life Insurance Other assets Other Assets Pledged securities Asset Pledged as Collateral [Member] Common stock outstanding (in shares) Common Stock, Shares, Outstanding Subordinated debentures Subordinated Debt [Member] Financial Instruments [Domain] Financial Instruments [Domain] Credit Loss Status [Domain] Credit Loss Status [Domain] Provision for (release of) credit losses Total ACL, (Release) Provision Provision for Loan, Lease, and Other Losses Entity Central Index Key Entity Central Index Key Schedule of Fair Value, Off-balance Sheet Risks [Table] Schedule of Fair Value, Off-balance Sheet Risks [Table] Schedule of Held-to-maturity Securities [Line Items] Schedule of Held-to-maturity Securities [Line Items] Rate   Reduction Contractual Interest Rate Reduction [Member] Total capital Banking Regulation, Total Capital, Actual Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table] Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table] Financing Receivable, Past Due [Table] Financing Receivable, Past Due [Table] Cash flow hedge Interest Rate Cash Flow Hedge Liability at Fair Value Customer relationship intangible Customer Relationships [Member] Allowance for credit losses, AFS portfolio Debt Securities, Available-for-Sale, Amortized Cost, Allowance for Credit Loss, Excluding Accrued Interest Risk participations Risk participations Risk Participations [Member] Represents information about risk participations. Total capital Banking Regulation, Total Risk-Based Capital Ratio, Actual Long-term debt Long-term debt assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt HTM, Fair Value Debt Securities, Held-to-maturity, Maturity, Fair Value, Rolling Maturity [Abstract] Residential MBS Residential Mortgage Backed Securities [Member] Summary of AFS debt securities in an unrealized loss position Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] Schedule of long-term debt Schedule of Long-term Debt Instruments [Table Text Block] Debt Instrument [Line Items] Debt Instrument [Line Items] Trading Symbol Trading Symbol Derivative financial instruments Derivative Asset Supplemental consolidated pro forma revenue Business Acquisition, Pro Forma Revenue Financial instruments whose contract amounts represent credit risk: Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] Unrealized Loss, Total Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss Other assets Increase (Decrease) in Other Operating Assets Nonaccrual loans Nonaccrual Status [Abstract] Proceeds from sales Proceeds from sales Proceeds from Sale of Debt Securities, Available-for-sale Derivative assets, measurement input Derivative Asset, Measurement Input Derivative assets Derivative Financial Instruments, Assets [Member] Deposits: Deposits [Abstract] Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Commercial MBS, Non-agency Commercial Mortgage-Backed Securities, Issued By Private Enterprises [Member] Debt securities collateralized by commercial real estate mortgage loans (mortgages), issued by non-governmental sponsored enterprises. Liabilities: Liabilities, Fair Value Disclosure [Abstract] Nonaccrual loans with no allowance Financing Receivable, Nonaccrual, No Allowance Compensation expense Share-based Payment Arrangement, Expense Exercisable, Weighted Average Remaining Term (in years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Goodwill and other intangible assets, net Total goodwill and other intangible assets, net Intangible Assets, Net (Including Goodwill) Net income per common share: Earnings Per Share, Basic and Diluted [Abstract] Salaries and employee benefits Salaries and employee benefits expense Labor and Related Expense Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Summary of HTM debt securities in an unrealized loss position Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract] U.S. Government agencies & GSEs US Government-sponsored Enterprises Debt Securities [Member] Schedule of accrued interest receivable Schedule Of Debt Securities Accrued Interest Receivable [Table Text Block] Schedule Of Debt Securities Accrued Interest Receivable Total liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Amortization of prior service cost and actuarial losses included in net periodic pension cost for defined benefit pension plan, Net of Tax Amount Other Comprehensive Income Loss Amortization Of Prior Service Cost And Actuarial Losses Include Net Periodic Pension Cost For Defined Benefit Pension Plan Net Of Tax Other comprehensive income amortization of prior service cost and actuarial losses included in net periodic pension cost for defined benefit pension plan, net of tax. Originated five or more years prior Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year Common Stock Issuable Common Stock Issuable [Member] Common stock issuable. Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Schedule of fair value of derivative financial instruments on consolidated balance sheet Schedule of Derivative Instruments [Table Text Block] ACL at acquisition Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Thereafter Sales-Type and Direct Financing Leases, Lease Receivable, To Be Received, After Year Four Sales-Type and Direct Financing Leases, Lease Receivable, To Be Received, After Year Four Purchases Payments to Acquire Held-to-maturity Securities Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Intangibles subject to amortization, gross Finite-Lived Intangible Assets, Gross Gross contractual amounts receivable Business Combination, Acquired Receivables, Gross Contractual Amount Deposits Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Deposits Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Deposits Progress Progress Bank And Trust [Member] Progress Bank And Trust Other operating expense Other Operating Expense [Member] Other Operating Expense Unrealized losses on available-for-sale securities, Before-tax Amount OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax HTM, Fair Value, 1 to 5 years Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Schedule of actual results and pro forma information Business Acquisition, Pro Forma Information, Nonrecurring Adjustments [Table Text Block] Aggregate Intrinsic Value, Vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested Beginning balance Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Outside services - electronic banking Noninterest Expense, Outside Services Electronic Banking Noninterest Expense, Outside Services Electronic Banking Recurring Fair Value, Recurring [Member] Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] Financial instruments Unused Commitments to Extend Credit Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Reclassifications related to derivative financial instruments accounted for as cash flow hedges Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Measurement Basis [Axis] Measurement Basis [Axis] Pull through rate Measurement Input, Pull Through Rate [Member] Measurement Input, Pull Through Rate [Member] Commitments to extend credit Commitments to Extend Credit [Member] Revolvers converted to term loans Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Changes in assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Leverage ratio, Well-Capitalized Banking Regulation, Tier One Leverage Capital Ratio, Well Capitalized, Minimum Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Fair value hedge Fair Value Hedge Assets Credit Loss Status [Axis] Credit Loss Status [Axis] HTM, Amortized Cost, 5 to 10 years Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year Five through Ten Class of Stock [Domain] Class of Stock [Domain] Cash Payments to Acquire Businesses, Gross Cash dividends on preferred stock Payments of Ordinary Dividends, Preferred Stock and Preference Stock Regulatory Capital Requirements Under Banking Regulations [Abstract] Regulatory Capital Requirements Under Banking Regulations Schedule of minimum future lease payments expected to be received from equipment financing lease contracts Sales-type and Direct Financing Leases, Lease Receivable, Maturity [Table Text Block] Reclassification of losses on derivative instruments realized in net income, Tax (Expense) Benefit Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax Amortization of prior service cost and actuarial losses included in net periodic pension cost for defined benefit pension plan, Tax (Expense) Benefit Other Comprehensive Income Loss Amortization Of Prior Service Cost And Actuarial Losses Included In Net Periodic Pension Cost For Defined Benefit Pension Plan Tax Expense Benefit1 Represents amount of other comprehensive income (loss) amortization of prior service cost and actuarial losses included in net periodic pension cost for defined benefit pension plan, tax expense benefit. Debt and Equity Securities, FV-NI [Line Items] Debt and Equity Securities, FV-NI [Line Items] Originated three years prior Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year Debt securities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Asset-backed securities Asset-backed Securities [Member] Effect of dilutive securities: Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] Other noninterest income Other Noninterest Income [Member] Information of other noninterest income [Member] Total gross derivative instruments Derivative Liability, Fair Value, Gross Liability Bank-owned life insurance Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Bank Owned Life Insurance Represents amount of Bank owned life insurance recognized as of the acquisition date. Derivative Liability Derivative Liability [Abstract] Preferred Stock Preferred Stock [Member] Purchase price Financing Receivable, Purchased with Credit Deterioration, Amount at Purchase Price Reclassification of losses on derivative instruments realized in net income, Before-tax Amount Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax Tier 1 capital Banking Regulation, Tier One Risk-Based Capital, Actual Depreciation, amortization and accretion, net Depreciation, Amortization and Accretion, Net Schedule of quantitative information about Level 3 fair value measurements for fair value on a recurring basis Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Preferred stock liquidation preference (in dollars per share) Preferred Stock, Liquidation Preference, Value Less discount Debt Instrument, Unamortized Discount Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Long-term Debt Long-term Debt [Text Block] Debt Securities, Available For Sale And Held To Maturity [Table] Debt Securities, Available For Sale And Held To Maturity [Table] Debt Securities, Available For Sale And Held To Maturity [Table] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]