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] Supplemental disclosures of cash flow information: Supplemental Cash Flow Information [Abstract] Realized gains on AFS securities AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] FinTrust FinTrust [Member] FinTrust Letters of credit Letter of Credit [Member] CET1 capital Banking Regulation, Common Equity Tier One Risk-Based Capital, Actual Unsettled government guaranteed loan sales Unsettled Government Guaranteed Loan Sales Represents unsettled government guaranteed loan sale. Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Net income Net income, Net of Tax Amount Net income Net Income (Loss) Attributable to Parent Consolidated Entities [Axis] Consolidated Entities [Axis] 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 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. Income Statement Location [Axis] Income Statement Location [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Receivable Type [Axis] Receivable Type [Axis] Merger-related and other charges Business Combination, Acquisition Related Costs Entity Address, Address Line One Entity Address, Address Line One 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 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 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 Entity Filer Category Entity Filer Category 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] 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 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 Unrealized Loss, Less than 12 Months Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Net change in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect FDIC assessments and other regulatory charges Federal Deposit Insurance Corporation Premium Expense 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] Amounts included in earnings - fair value adjustments 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 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] 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 $2,255 and $1,570 and $4,405 and $3,093, respectively Interest and Dividend Income, Securities, Operating 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. 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 AFS, Fair Value, More than 10 years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value Subsequent Event Type [Domain] Subsequent Event Type [Domain] 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] Amortization of intangibles Amortization of Intangible Assets 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 Antidilutive securities excluded from computation (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 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] Subsequent Events [Abstract] Subsequent Events [Abstract] ACL - loans, (Release) Provision Financing Receivable, Credit Loss, Expense (Reversal) Business Combination and Asset Acquisition [Abstract] Business Acquisition [Axis] Business Acquisition [Axis] 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 Carrying amount of Assets (Liabilities) Hedged Liability, Fair Value Hedge Cash flow hedging Cash Flow Hedging [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 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 Entity Listings [Table] Entity Listings [Table] Amounts included in earnings - fair value adjustments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Customer derivative positions Customer Swap Position [Member] Represents the customer swap positions. 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] 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 Nonrecurring Fair Value, Nonrecurring [Member] Additions Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances State and political subdivisions US States and Political Subdivisions Debt Securities [Member] Derivatives and Hedging Activities Derivative Instruments and Hedging Activities Disclosure [Text Block] 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 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] Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] Entity Address, City or Town Entity Address, City or Town HTM Held-to-maturity Securities [Member] Retained Earnings Retained Earnings [Member] Mortgage loan revenue Mortgage Loan Revenue [Member] Information of mortgage loan revenue. Revolvers Financing Receivable, Excluding Accrued Interest, Revolving AFS debt securities: Debt Securities, Available-for-sale [Abstract] Total deposits Deposits Deposits Financial Asset, Aging [Domain] Financial Asset, Aging [Domain] Advertising and public relations Marketing and Advertising Expense Interest expense: Interest Expense [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Financing Receivable, Past Due [Line Items] Financing Receivable, Past Due [Line Items] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Employees Employee [Member] Employee Less: Amounts subject to master netting agreements Derivative Liability, Not Offset, Policy Election Deduction Schedule of AFS debt securities in an unrealized loss position Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block] 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 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 HTM debt securities Fair Value Fair value Debt Securities, Held-to-maturity, Fair Value 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). Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Amounts 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] Loans receivable Loans Receivable [Member] 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 Mortgage banking - forward sales commitment Mortgage Banking Forward Sales Commitment [Member] Represents mortgage banking - forward sales commitment. Derivatives designated as hedging instruments Derivative Instruments in Hedges, Liabilities, at Fair Value 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 Short-term borrowings Interest Expense, Other Short-term Borrowings 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 Balance at beginning of period Balance at end of period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Document Type Document Type Total loans Financing Receivable, 90 Days or More Past Due, Still Accruing 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 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] 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] Other Other Type Of Modification [Member] Represents type of modification other not defined elsewhere. Net decrease (increase) in loans Payments to Acquire Finance Receivables Pass Pass [Member] 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] Derivative financial instruments Total gross derivative instruments Derivative Asset, Fair Value, Gross Asset Debt Securities, Held-to-maturity [Table] Debt Securities, Held-to-maturity [Table] Unrealized holding gains (losses) on derivatives arising during the period, Before-tax Amount Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax Deferred compensation plan assets Deferred Compensation Plan Assets Total consideration Business Combination, Consideration Transferred Noninterest income: Noninterest Income [Abstract] 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). Consumer Consumer Portfolio Segment [Member] Remainder of 2021 Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Remainder of Fiscal Year Assets: Assets, Fair Value Disclosure [Abstract] Long-term debt Long-term Debt Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Total assets Loans Assets, Fair Value Disclosure Level 1 Fair Value, Inputs, Level 1 [Member] Investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] 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 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. 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] Fair Value, Total Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value Mortgage banking derivatives Mortgage Banking Derivatives [Member] Information of Mortgage banking derivatives. Derivatives designated as hedging instruments Derivative Instruments in Hedges, Assets, at Fair Value 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 Capital surplus Additional Paid in Capital Net amount Derivative Liability, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election LIABILITIES AND SHAREHOLDERS’ EQUITY Liabilities and Equity [Abstract] Derivative liabilities Derivative Financial Instruments, Liabilities [Member] 2024 Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year Three Derivative [Line Items] Derivative [Line Items] Hedging Relationship [Domain] Hedging Relationship [Domain] Interest rate swaps Interest Rate Swap [Member] Transfers into Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3 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 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. Earnings Per Share Earnings Per Share [Text Block] Noninterest expenses: Operating Expenses [Abstract] Salaries and employee benefits expense Salaries And Employee Benefit Expense [Member] Salaries And Employee Benefit Expense Accounting Changes and Error Corrections [Abstract] Accounting Changes and Error Corrections [Abstract] Minimum Minimum [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] Estimated residual value of leased equipment Sales Type And Direct Financing Leases, Unguaranteed Residual Asset Sales Type And Direct Financing Leases, Unguaranteed Residual Asset Balance Sheet Location [Domain] Balance Sheet Location [Domain] Total liabilities Financial and Nonfinancial Liabilities, Fair Value Disclosure Income before income taxes Net income, Before-tax Amount Total before tax Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Preferred stock authorized (in shares) Preferred Stock, Shares Authorized United Community Bank Subsidiaries [Member] HTM, Amortized Cost Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity [Abstract] Gross Unrealized Gains Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 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 Trading Symbol Trading Symbol Net deferred tax asset Deferred Income Tax Assets, Net Debt securities available-for-sale: Debt Securities Available-For-Sale And Equity Securities [Abstract] Debt Securities Available-For-Sale And Equity Securities [Abstract] Receivable [Domain] Receivable [Domain] Issuance of stock Stock Issued During Period, Value, New Issues Beginning balance (shares) Ending balance (shares) Shares, Outstanding 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] Unrealized Loss, Total Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss 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] Accounting Policies [Abstract] Accounting Policies [Abstract] 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; 86,664,894 and 86,675,279 shares issued and outstanding, respectively Common Stock, Value, Issued Income producing commercial real estate Income Producing Commercial Real Estate [Member] Property that represents income producing commercial real estate. 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 Basis of Accounting 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 income Accumulated Other Comprehensive Income (Loss), Net of Tax 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] Allowance for credit losses, HTM portfolio Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest Receivables [Abstract] Receivables [Abstract] 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 AFS, Fair Value Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Cash flow hedge of trust preferred securities Trust Preferred Securities Hedge [Member] Trust Preferred Securities Hedge Document Period End Date Document Period End Date Derivative Liabilities Derivative Liability [Member] Represents Derivative Liability. 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 CET1 capital, Minimum Banking Regulation, Common Equity Tier One Risk-Based Capital Ratio, Capital Adequacy, Minimum 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] 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 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. Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] 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 Unrealized gains (losses) on available-for-sale securities, Tax (Expense) Benefit OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax 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] Financial Instrument [Axis] Financial Instrument [Axis] Shares issued in acquisition (in shares) Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Common stock dividends (in dollars per share) Common Stock, Dividends, Per Share, Declared Debt securities available-for-sale Fair Value Fair Value Debt Securities, Available-for-Sale, Excluding Accrued Interest 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 Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Loans and Leases and Allowance for Credit Losses Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Reliant Bancorp, Inc Reliant Bancorp, Inc [Member] Reliant Bancorp, Inc Equity [Abstract] Equity [Abstract] Carrying Amount Reported Value Measurement [Member] 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] Gross Unrealized Losses Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss Measurement Input Type [Domain] Measurement Input Type [Domain] Derivative assets - mortgage Derivative Assets Mortgage [Member] Derivative Assets Mortgage Fair Value, Less than 12 Months Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months Common stock, par value $1 per share Common Stock Common Stock [Member] Professional fees Professional Fees Leverage ratio, Minimum Banking Regulation, Tier One Leverage Capital Ratio, Capital Adequacy, Minimum TDRs Financing Receivable, Troubled Debt Restructuring Equity investments, inflows Proceeds from Sale of Other Assets, Investing Activities Gains from sales of other loans, net Gain (Loss) on Sale of Loans and Leases Financial Asset, Aging [Axis] Financial Asset, Aging [Axis] Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-sale [Line Items] Gross Unrealized Losses Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Hedging Designation [Axis] Hedging Designation [Axis] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Securities gains, net Securities gains, net Debt Securities, Available-for-sale, Realized Gain (Loss) Stock based compensation Share-based Payment Arrangement, Noncash Expense Equity investments, outflows Payments to Acquire Other Investments Capital Surplus Additional Paid-in Capital [Member] Average total assets for the leverage ratio Regulatory Assets 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 Debt securities held-to-maturity (fair value $861,488 and $437,193, respectively) Amortized Cost Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss Actuarial losses Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] Number of Contracts Financing Receivable, Modifications, Number of Contracts Regulatory Matters Regulatory Capital Requirements under Banking Regulations [Text Block] Less: Cash collateral received/pledged Derivative Liability, Fair Value of Collateral Notional Amount Derivative, Notional Amount Debt Security Category [Axis] Debt Security Category [Axis] Long-term debt Long-term Debt, Fair Value Mortgage Loans Held for Sale Mortgage Loans Held For Sale [Abstract] Mortgage Loans Held For Sale Other investing activities Payments for (Proceeds from) Other Investing Activities Purchases of common stock (in shares) Shares repurchased (in shares) Purchases of common stock (in shares) Stock Repurchased and Retired During Period, Shares Purchases of premises and equipment Payments to Acquire Property, Plant, and Equipment Dividends on preferred stock Preferred Stock Dividends, Income Statement Impact Maximum Maximum [Member] Share-based Payment Arrangement [Abstract] Share-based Payment Arrangement [Abstract] Prepayment rate Measurement Input, Prepayment Rate [Member] 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 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] Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Servicing rights for SBA/USDA loans Servicing Asset at Fair Value, Amount Award Type [Axis] Award Type [Axis] Financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Measurement Input Type [Axis] Measurement Input Type [Axis] Total shareholders' equity Beginning balance Ending balance Stockholders' Equity Attributable to Parent 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 Service charges and fees Deposit Account [Member] Preferred stock issued (in shares) Preferred Stock, Shares Issued 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 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. 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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] Mortgage loans held for sale Fair value Mortgages Held-for-sale, Fair Value Disclosure Amounts 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 Derivative financial instruments Derivative Asset 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 Total revenue Revenues 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] 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 Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Interest-bearing deposits Interest-bearing Deposit Liabilities 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. Unrealized holding (losses) on derivatives arising during the period, 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] Liabilities: Liabilities, Fair Value Disclosure [Abstract] Nonaccrual loans with no allowance Financing Receivable, Nonaccrual, No Allowance Contingent consideration Business Combination, Consideration Transferred, Liabilities Incurred Compensation expense Share-based Payment Arrangement, Expense Debt Securities, Trading, and Equity Securities, FV-NI [Table] Debt Securities, Trading, and Equity Securities, FV-NI [Table] Goodwill and other intangible assets, net Intangible Assets, Net (Including Goodwill) Net income per common share: Earnings Per Share, Basic and Diluted [Abstract] 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 Salaries and employee benefits Salaries and employee benefits expense Labor and Related Expense Other Noninterest Income, Other Operating Income Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Supranational entities Other Debt Obligations [Member] Servicing rights for SBA/USDA loans, measurement input Servicing Asset, Measurement Input 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 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. 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Cash and cash equivalents, at beginning of period Cash and cash equivalents, at 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 Proceeds from maturities and calls Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Discount rate Measurement Input, Discount Rate [Member] Effect of hedging relationships on interest expense: Summary of Derivative Instruments Impact on Results of Operations [Abstract] 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] 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] Entity Central Index Key Entity Central Index Key Financing Receivable, Troubled Debt Restructuring [Line Items] Financing Receivable, Troubled Debt Restructuring [Line Items] Security Exchange Name Security Exchange Name Other operating expense Other Operating Expense [Member] Other Operating Expense Nonaccrual loans with an allowance Financing Receivable, Nonaccrual, With Allowance Amount of financing receivable on nonaccrual status with an allowance for credit loss. 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 Total noninterest expenses Noninterest Expense Aggregate Intrinsic Value, Vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested 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 Balance at beginning of period Balance at end of period 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 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 Common Stock Stockholders' Equity Note Disclosure [Text Block] Schedule of nonaccrual loans by loan class Financing Receivable, Nonaccrual [Table 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] Owner occupied commercial real estate Owner Occupied Commercial Real Estate [Member] Represents information of owner occupied commercial real estate. Pull through rate Measurement Input, Pull Through Rate [Member] Measurement Input, Pull Through Rate [Member] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Commitments to extend credit Commitments to Extend Credit [Member] Revolvers converted to term loans Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan Loans and leases, net Loans Receivable, Fair Value Disclosure Occupancy Occupancy, Net Not designated as hedging instrument Not Designated as Hedging Instrument [Member] 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] Common stock issuable (in shares) Common Stock Issuable, Shares Represents number of shares of common stock issuable. Leverage ratio, Well-Capitalized Banking Regulation, Tier One Leverage Capital Ratio, Well Capitalized, Minimum 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 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 Wealth management fees Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions 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 Cash paid for shares withheld to cover payroll taxes upon vesting of restricted stock units Payment, Tax Withholding, Share-based Payment Arrangement 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. Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Debt and Equity Securities, FV-NI [Line Items] Debt and Equity Securities, FV-NI [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 Originated three years prior Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year 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 Entity Listings [Line Items] Entity Listings [Line Items] 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] Loans held for sale at fair value Loans Held-for-sale, Fair Value Disclosure Asset-backed securities Asset-backed Securities [Member] Recently Adopted Standards and Recently Issued Standards New Accounting Pronouncements, Policy [Policy Text Block] Effect of dilutive securities: Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] Unrecognized compensation expense Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Other noninterest income Other Noninterest Income [Member] Information of other noninterest income [Member] 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] Derivative financial instruments Total gross derivative instruments Derivative Liability, Fair Value, Gross Liability Subsequent event Subsequent Event [Member] Deposits Deposit Balance Sheet Account [Member] Deposit Balance Sheet Account [Member] Cover [Abstract] Cover [Abstract] Derivative Liability Derivative Liability [Abstract] Accrued interest receivable Interest Receivable and Other Assets [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 Assets: Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] 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] 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 Preferred stock liquidation preference (in dollars per share) Preferred Stock, Liquidation Preference, Value 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 (benefit) Deferred Income Tax Expense (Benefit) 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]