Realized gains on AFS securities AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] 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] 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 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 Preferred stock dividends Dividends, Preferred Stock Total other comprehensive income (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 Short-term deferrals related to COVID-19 crisis Financing Receivable, COVID Related Deferral Financing Receivable, COVID Related Deferral 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] 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 $2,280 and $1,895 and $6,685 and $4,988, 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. Document Fiscal Year Focus Document Fiscal Year Focus Subsequent Event Type [Domain] Subsequent Event Type [Domain] Contingent consideration Business Combination, Liabilities Arising from Contingencies, Amount Recognized Amortization of intangibles Amortization of Intangible Assets Expected useful life of acquired intangible (in years) Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Repurchase program remaining authorization Stock Repurchase Program, Remaining Authorized Repurchase Amount Proceeds from issuance of senior debentures, net of issuance costs Proceeds from Issuance of Senior Long-term Debt 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] Carrying amount of Assets (Liabilities) Hedged Liability, Fair Value Hedge Business Acquisition [Axis] Business Acquisition [Axis] Cash flow hedging Cash Flow Hedging [Member] Entity Listings [Table] Entity Listings [Table] 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] Nonrecurring Fair Value, Nonrecurring [Member] 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] Intangible asset acquired Finite-lived Intangible Assets Acquired 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] 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] 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 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 Document Type Document Type 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] Entity Current Reporting Status Entity Current Reporting Status 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] Adoption of new accounting standard Adoption of CECL Cumulative Effect, Period of Adoption, Adjustment [Member] Pass Pass [Member] Derivative financial instruments Total gross derivative instruments Derivative Asset, Fair Value, Gross Asset Unrealized holding gains (losses) 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 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 Long-term Debt Level 1 Fair Value, Inputs, Level 1 [Member] Investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Schedule of loans by aging category and accrual status Financing Receivable, Past Due [Table Text Block] 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 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. 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 Capital surplus Additional Paid in Capital LIABILITIES AND SHAREHOLDERS’ EQUITY Liabilities and Equity [Abstract] 2024 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] Option and warrant equity instruments Options And Warrants [Member] Options And Warrants Transfers into Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3 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. Salaries and employee benefits expense Salaries And Employee Benefit Expense [Member] Salaries And Employee Benefit Expense 2025 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] Gross Unrealized Gains Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Trading Symbol Trading Symbol Net deferred tax asset Deferred Income Tax Assets, Net Common stock issued for acquisitions Stock Issued During Period, Value, Acquisitions Receivable [Domain] Receivable [Domain] Nonrecurring Adjustment [Axis] Nonrecurring Adjustment [Axis] Beginning balance (shares) Ending balance (shares) Shares, Outstanding 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 Derivative Instrument [Axis] Derivative Instrument [Axis] Common stock, $1 par value: 200,000,000 and 150,000,000 shares authorized, respectively; 86,558,647 and 86,675,279 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] Total loans sold Financing Receivable, Sale 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] 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] 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 Net decrease (increase) in loans Proceeds from Collection of Finance Receivables 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] Equity [Abstract] Equity [Abstract] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Comprehensive income, 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 Leverage ratio, Minimum Banking Regulation, Tier One Leverage Capital Ratio, Capital Adequacy, Minimum TDRs Financing Receivable, Troubled Debt Restructuring 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] Equity investments, outflows Payments to Acquire Other Investments Capital Surplus Additional Paid-in Capital [Member] Average total assets for the leverage ratio Regulatory Assets Unsettled securities purchases Unsettled Purchases Of Securities Available For Sale Unsettled Purchases Of Securities Available For Sale 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 $1,079,925 and $437,193, 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 Purchases of common stock (in shares) Shares repurchased (in shares) Stock Repurchased and Retired During Period, Shares Maximum Maximum [Member] Share-based Payment Arrangement [Abstract] Share-based Payment Arrangement [Abstract] Prepayment rate Measurement Input, Prepayment Rate [Member] Amortization of losses included in net income on available-for-sale securities transferred to held-to-maturity, Net of Tax Amount Other Comprehensive Income, Reclassification Adjustment For Available For Sale Transferred To Held To Maturity Securities, After Tax Other Comprehensive Income, Reclassification Adjustment For Available For Sale Transferred To Held To Maturity Securities, After Tax Legal Entity [Axis] Legal Entity [Axis] 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] 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 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, 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 Repurchase of common stock Payments for Repurchase of Common Stock 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 2022 Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year One Equipment financing Equipment financing receivables Equipment Financing [Member] Represents information related to equipment financing. Assets under management Assets under Management, Carrying Amount 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 (RSUs) [Member] Derivatives not designated as hedging instruments Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value 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] Asset Class [Domain] Asset Class [Domain] Loan Restructuring Modification [Axis] Loan Restructuring Modification [Axis] Nonaccrual Loans Nonaccrual loans Financing Receivable, Nonaccrual Basis of Presentation Basis of Presentation and Significant Accounting Policies [Text Block] 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 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] Undistributed earnings allocated to participating securities Undistributed Earnings (Loss) Allocated to Participating Securities, Basic Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Derivative Instruments [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Entity Small Business Entity Small Business 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] 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 Common stock issued in acquisition Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Unrealized holding gains (losses) on derivatives, Net of Tax Amount Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Structure Extended Maturity [Member] Common stock issued for acquisitions (in shares) Stock Issued During Period, Shares, Acquisitions Amortization of losses included in net income on AFS securities transferred to HTM Accumulated Amortization Of Gains Included In Net Income On Available For Sale Securities Transferred To Held To Maturity [Member] Represents accumulated amortization of gains included in net income on available for sale securities transferred to held to maturity. Additions Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances Liabilities: Liabilities [Abstract] 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] Schedule of carrying amount and cumulative fair value hedging adjustments on hedged liability Schedule Of Fair Value Hedging Instruments, Carrying Value And Basis Adjustments [Table Text Block] Schedule Of Fair Value Hedging Instruments, Carrying Value And Basis Adjustments [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 Accrued purchase price and contingent consideration Accrued Purchase Price And Contingent Consideration Accrued Purchase Price And Contingent Consideration Total other comprehensive income (loss), Net of Tax Amount Other comprehensive income (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 Schedule of loans held for sale at fair value under the fair value option Fair Value Option, Disclosures [Table Text Block] Securities gains, 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 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 Product and Service [Domain] Product and Service [Domain] 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 gains 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 gains 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 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] Assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Interest expense Interest Expense [Member] Subsequent Events Subsequent Events [Text Block] 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 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 Schedule of restricted stock unit activity Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] 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 2024 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] Derivative [Table] Derivative [Table] Net cash flow hedge activity, Before-tax Amount Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax Equity instruments issued in acquisition Business Acquisition, Equity Interest Issued or Issuable, Value Assigned Interest revenue: Interest and Dividend Income, Operating [Abstract] 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 gains (losses), Net of Tax Amount OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax Consolidated Entities [Domain] Consolidated Entities [Domain] Amortization of losses included in net income on available-for-sale securities transferred to held-to-maturity, Tax (Expense) Benefit Other Comprehensive Income, Reclassification Adjustment For Available For Sale Transferred To Held To Maturity Securities, Tax Other Comprehensive Income, Reclassification Adjustment For Available For Sale Transferred To Held To Maturity Securities, Tax Income Statement Location [Domain] Income Statement Location [Domain] 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] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Interest-bearing deposits Interest-bearing Deposit Liabilities Unrealized holding (losses) 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] 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] Document Fiscal Period Focus Document Fiscal Period Focus 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] 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] 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 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 Assets acquired Noncash or Part Noncash Acquisition, Value of Assets Acquired Less: Cash collateral received/pledged Derivative Asset, Fair Value of Collateral 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] 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. 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 Wealth management fees Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions Cash paid for shares withheld to cover payroll taxes upon vesting of restricted stock units 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] Entity Address, Postal Zip Code Entity Address, Postal Zip Code 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 Amortization of losses included in net income on available-for-sale securities transferred to held-to-maturity, Before-tax Amount Other Comprehensive Income, Reclassification Adjustment For Available For Sale Transferred To Held To Maturity Securities, Before Tax Other Comprehensive Income, Reclassification Adjustment For Available For Sale Transferred To Held To Maturity Securities, Before Tax Reclassifications Out of AOCI Disclosure of Reclassification Amount [Text Block] Title of 12(b) Security Title of 12(b) Security 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; Series I, $25,000 per share liquidation preference; 4,000 shares issued and outstanding 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] Subsequent event Subsequent Event [Member] Cover [Abstract] Cover [Abstract] Accrued interest receivable Interest Receivable and Other Assets [Abstract] Total intangibles subject to amortization, net Finite-Lived Intangible Assets, Net Goodwill Balance, beginning of period Balance, end of period Goodwill Operating lease liabilities recognized Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Operating Lease Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Operating Lease Liabilities Assets: Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Unrealized Loss, Less than 12 Months Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Purchase accounting premium Sales Type And Direct Financing Leases, Purchase Accounting Premium Sales Type And Direct Financing Leases, Purchase Accounting Premium 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 Subsequent Event Type [Axis] Subsequent Event Type [Axis] Aquesta Financial Holdings, Inc Aquesta Financial Holdings, Inc [Member] Aquesta Financial Holdings, Inc 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] 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] Repurchase program authorized amount Stock Repurchase Program, Authorized Amount Hedging Designation [Domain] Hedging Designation [Domain] FinTrust FinTrust [Member] FinTrust Unsettled government guaranteed loan sales Unsettled Government Guaranteed Loan Sales Represents unsettled government guaranteed loan sale. 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 Entity Emerging Growth Company Entity Emerging Growth Company Tier 1 capital, Well-Capitalized Banking Regulation, Tier One Risk-Based Capital Ratio, Well Capitalized, Minimum 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 Entity Address, Address Line One Entity Address, Address Line One 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 Entity Filer Category Entity Filer Category 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 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) Hedge Accounting Basis Adjustment Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) Liability Class [Axis] Liability Class [Axis] 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 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 gains (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 gains (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 Proceeds from Sale of Other Real Estate 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] Entity Address, City or Town Entity Address, City or Town HTM Held-to-maturity Securities [Member] 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 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 Purchases of common stock Stock Repurchased and Retired During Period, Value 2025 Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year Four 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] Entity Interactive Data Current Entity Interactive Data Current Number of derivative contracts Number of Interest Rate Derivatives Held Losses 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 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] Intangible asset 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. Net decrease (increase) in loans Payments to Acquire Finance Receivables Dealer offsets to bifurcated embedded derivatives Dealer Offsets To Bifurcated Embedded Derivatives [Member] Represents the dealer offsets to bifurcated embedded derivatives. Construction Construction Loans [Member] Debt Securities, Held-to-maturity [Table] Debt Securities, Held-to-maturity [Table] Total consideration Business Combination, Consideration Transferred Noninterest income: Noninterest Income [Abstract] Goodwill [Roll Forward] Goodwill [Roll Forward] Remainder of 2021 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 Loans 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 Document Transition Report Document Transition Report 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 gains (losses), Before-tax Amount OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax 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 Derivative liabilities Derivative Liabilities Derivative Financial Instruments, Liabilities [Member] Derivative [Line Items] Derivative [Line Items] 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] 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] Cumulative Effect, Period of Adoption [Axis] Cumulative Effect, Period of Adoption [Axis] Fair Value, 12 Months or More Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer Debt securities available-for-sale: Debt Securities Available-For-Sale And Equity Securities [Abstract] Debt Securities Available-For-Sale And Equity Securities [Abstract] Issuance of stock Stock Issued During Period, Value, New Issues Supplemental Cash Flow Information Cash Flow, Supplemental Disclosures [Text Block] Net cash (paid for) received in acquisition Payments to Acquire Businesses, Net of Cash Acquired 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. 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] Equity Interest Issued or Issuable, Type [Domain] Equity Interest Issued or Issuable, Type [Domain] 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) income Accumulated Other Comprehensive Income (Loss), Net of Tax 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] Document Period End Date Document Period End Date CET1 capital, Minimum Banking Regulation, Common Equity Tier One Risk-Based Capital Ratio, Capital Adequacy, Minimum Adjusted Balance Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Net Investment in Leases Net Investment in Lease, before Allowance for Credit Loss [Abstract] Entity Registrant Name Entity Registrant Name Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Unrealized gains (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] Debt securities available-for-sale Fair Value Fair Value Debt Securities, Available-for-Sale, Excluding Accrued Interest Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Reliant Bancorp, Inc 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 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 2023 Finite-Lived Intangible Asset, Expected Amortization, Year Two Hedging Designation [Axis] Hedging Designation [Axis] Securities gains, net Securities gains, net Debt Securities, Available-for-sale, Realized Gain (Loss) Stock based compensation Share-based Payment Arrangement, Noncash Expense Total other comprehensive income (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 gains included in net income, Tax (Expense) Benefit Income tax expense attributable to sales Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Total liabilities Liabilities Unearned income Sales Type And Direct Financing Leases, Deferred Selling Profit Sales Type And Direct Financing Leases, Deferred Selling Profit Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] 2022 Finite-Lived Intangible Asset, Expected Amortization, Year One 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 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 Investment securities interest revenue Interest and Dividend Income, Operating Loans Past Due, 60 - 89 Days Financial Asset, 60 to 89 Days Past Due [Member] City Area Code City Area Code 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 Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] U.S. Treasuries US Treasury Securities [Member] Amendment Flag Amendment Flag 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] Common stock issuable: 588,258 and 600,834 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] 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. Deposits Deposits, Fair Value Disclosure Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Computation of basic and diluted earnings per share Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Carrying value of securities pledged to secure public deposits, derivatives and other secured borrowings Pledged Financial Instruments, Not Separately Reported, Securities Communications and equipment Communications and Information Technology Entity File Number Entity File Number Loans, including fees Interest and Fee Income, Loans and Leases Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Product and Service [Axis] Product and Service [Axis] HTM, Fair Value, Not due at single maturity Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value Fair Value, Less than 12 Months Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Impact of equity-based compensation awards (in shares) Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture Accrued expenses and other liabilities Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Statement [Line Items] Statement [Line Items] CET1 capital Banking Regulation, Common Equity Tier One Risk-Based Capital Ratio, Actual Schedule of amortized cost of loans by risk category by vintage year Financing Receivable Credit Quality Indicators [Table Text Block] 2023 Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year Two Schedule of effect of derivatives in hedging relationships on the consolidated statement of income Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location [Table Text Block] Impact of equity-based compensation awards Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture Minimum future lease payments receivable Sales-type and Direct Financing Leases, Lease Receivable Entity Address, State or Province Entity Address, State or Province Entity [Domain] Entity [Domain] Total capital, Minimum Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum Tier 1 capital Banking Regulation, Tier One Risk-Based Capital Ratio, Actual Total Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received PPP loans included in commercial & industrial Commercial And Industrial Classification, PPP Loan Component [Member] Commercial And Industrial Classification, PPP Loan Component Entity Shell Company Entity Shell Company Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Asset Class [Axis] Asset Class [Axis] Local Phone Number Local Phone Number Cash flow hedge Interest Rate Cash Flow Hedge Asset at Fair Value Total assets Assets Assets Directors Director [Member] Classifications of loans Financing Receivable, after Allowance for Credit Loss [Abstract] Mortgage loan gains and other related fees Fair Value, Option, Changes in Fair Value, Gain (Loss) Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Schedule of major classifications of loan portfolio Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Derivative Contract [Domain] Derivative Contract [Domain] ACL - loans, Charge-Offs Financing Receivable, Allowance for Credit Loss, Writeoff Right-of-use assets recognized Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Right-Of-Use Assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Right-Of-Use Assets Cumulative Effect, Period of Adoption [Domain] Cumulative Effect, Period of Adoption [Domain] Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities 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] Entity Tax Identification Number Entity Tax Identification Number 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 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, Net of Tax Amount Comprehensive Income (Loss), Net of Tax, Attributable to Parent Other comprehensive income: Other Comprehensive Income (Loss), Net of Tax [Abstract] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] 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] Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Remainder of 2021 Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year Bank owned life insurance Bank Owned Life Insurance Other assets Other Assets Common stock outstanding (in shares) Common Stock, Shares, Outstanding Transfers into Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Financial Instruments [Domain] Financial Instruments [Domain] (Release of) provision for credit losses Total ACL, (Release) Provision Provision for Loan, Lease, and Other Losses 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 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 [Member] Represents information about risk participations. Total capital Banking Regulation, Total Risk-Based Capital Ratio, Actual 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] Derivative financial instruments Derivative Asset Supplemental consolidated pro forma revenue Business Acquisition, Pro Forma Revenue Document Quarterly Report Document Quarterly Report 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 and accrued interest receivable Increase (Decrease) in Other Operating Assets Proceeds from issuance of Series I preferred stock, net of issuance costs Proceeds from Issuance of Preferred Stock and Preference Stock 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] Gross goodwill Goodwill, Gross 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 Three Shores Three Shores Bancorporation, Inc. [Member] Three Shores Bancorporation, Inc. Compensation expense Share-based Payment Arrangement, Expense Payable due Business Combination, Consideration Transferred, Liabilities Incurred 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 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] Transfers of loans to foreclosed properties Real Estate Owned, Transfer to Real Estate Owned 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 Entity Central Index Key Entity Central Index Key Security Exchange Name Security Exchange Name Other operating expense Other Operating Expense [Member] Other Operating Expense Unrealized gains (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 Equity Interest Type [Axis] Equity Interest Type [Axis] 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] 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] Current Fiscal Year End Date Current Fiscal Year End Date Common Stock Stockholders' Equity Note Disclosure [Text Block] 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 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 consideration 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 Entity Listings [Line Items] Entity Listings [Line Items] Other investing outflows Payments For Other Investing Activities Payments For Other Investing Activities Loans held for sale at fair value Loans Held-for-sale, Fair Value Disclosure 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] Derivative financial instruments Total gross derivative instruments Derivative Liability, Fair Value, Gross Liability Deposits Deposit Balance Sheet Account [Member] Deposit Balance Sheet Account [Member] Derivative Liability Derivative Liability [Abstract] Preferred Stock Preferred Stock [Member] 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 Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [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]