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These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. 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Repayment of Federal Home Loan Bank advances Payments of FHLBank Borrowings, Financing Activities Average total assets Regulatory Assets Pass Pass Pass [Member] Cash dividends on common stock Payments of Ordinary Dividends, Common Stock Cash flows expected to be collected Certain Loans Acquired in Transfer Accounted for as Held-to-maturity Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition Servicing Asset at Amortized Cost [Table] Servicing Asset at Amortized Cost [Table] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Dividend date of record Dividends Payable, Date of Record Core deposit intangible Core Deposits [Member] Dividends on preferred stock Preferred Stock Dividends, Income Statement Impact Number of debt securities held-to-maturity in unrealized loss position Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions Adjustments for New Accounting Pronouncements [Axis] Accounting Standards Update [Axis] Thereafter Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, after Year Five Gross Unrealized Losses Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Tax Credit Carryforward [Table] Tax Credit Carryforward [Table] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Customer derivatives and dealer offsets Customer Derivatives And Dealer Offsets [Member] Information of Customer Derivatives And Dealer Offsets. Goodwill Goodwill Goodwill, beginning balance Goodwill, ending balance Goodwill Deposits: Deposits [Abstract] Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-sale [Line Items] Amortization of losses included in net income on available-for-sale securities transferred to held to maturity 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. 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] Total other comprehensive income (loss), Net of Tax Amount Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Unrealized gains on cash flow hedges Deferred Tax Liabilities, Unrealized Gain On Cash Flow Hedge Deferred Tax Liabilities, Unrealized Gain On Cash Flow Hedge 2021 Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year One Fair value Certain Loans Acquired in Transfer Accounted for as Held-to-maturity Debt Securities, Acquired During Period, at Acquisition, at Fair Value Net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards Held-to-Maturity, Fair Value, Not due at single maturity Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value Purchases of common stock Stock Repurchased and Retired During Period, Value BOLI earnings Income Tax Reconciliation, Bank Owned Life Insurance Earnings Income Tax Reconciliation, Bank Owned Life Insurance Earnings Assets acquired, fair value Fair Value of Assets Acquired Common stock dividends (in dollars per share) Cash dividend declared per common share (in dollars per share) Common Stock, Dividends, Per Share, Declared Buildings and improvements Buildings and improvements Building and Building Improvements [Member] Schedule of changes in the carrying amounts of goodwill Schedule of Goodwill [Table Text Block] Cancelled (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Asset Class [Domain] Asset Class [Domain] Schedule of nonaccrual loans by loan class Financing Receivable, Nonaccrual [Table Text Block] Interest revenue: Interest and Dividend Income, Operating [Abstract] Equity [Abstract] Equity [Abstract] Total assets Loans Assets, Fair Value Disclosure 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] Debt Securities, Held-to-maturity [Table] Debt Securities, Held-to-maturity [Table] Schedule of carrying amount of goodwill and other intangible assets Schedule of Intangible Assets and Goodwill [Table Text Block] Postage, printing and supplies Supplies and Postage Expense SOFR Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Provision for credit losses Total allowance for credit losses, (Release) Provision Provision for Loan, Lease, and Other Losses Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Net decrease in short-term borrowings Repayments of Short-term Debt Termination of defined benefit pension plan, Tax (Expense) Benefit Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax Derivative Contract [Domain] Derivative Contract [Domain] Available-for-Sale, 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 Diluted (in shares) Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Letters of credit Letter of Credit [Member] Service period to receive matching contribution Defined Contribution Plan, Service Period To Qualify For Matching Contributions Defined Contribution Plan, Service Period To Qualify For Matching Contributions Loans serviced for others not included in balance sheet Continuing Involvement with Derecognized Transferred Financial Assets, Amount Outstanding Number of operating segments Number of Operating Segments Cancelled (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Debt Disclosure [Abstract] Debt Disclosure [Abstract] Right-of-use asset, balance sheet line item Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Net amount Derivative Liability, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election Accrued expenses Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Repayment of long-term debt Repayments of Long-term Debt Net cash provided by (used in) financing activities Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Post-Modification Outstanding Recorded Investment by Type of Modification Financing Receivable, Troubled Debt Restructuring, Postmodification Substandard Substandard Substandard [Member] Schedule of average balances of impaired loans and income recognized on impaired loans while they were considered impaired Average Balances Of Impaired Loans and Income Recognized On Impaired Loans [Table Text Block] Average balances of impaired loans and income recognized on impaired loans. Accounting Standards Update and Change in Accounting Principle [Abstract] Cash dividends on preferred stock Payments of Ordinary Dividends, Preferred Stock and Preference Stock Tax Credit Carryforward, Name [Domain] Tax Credit Carryforward, Name [Domain] Balance at beginning of year Balance at end of year Unrecognized Tax Benefits Common stock, $1 par value; 150,000,000 shares authorized; 86,675,279 and 79,013,729 shares issued and outstanding, respectively Common Stock, Value, Issued 2024 Defined Benefit Plan, Expected Future Benefit Payment, Year Four Wealth management fees Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions Document Fiscal Year Focus Document Fiscal Year Focus Net deferred tax asset Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets 2022 Finite-Lived Intangible Asset, Expected Amortization, Year Two Total other comprehensive income (loss), Tax (Expense) Benefit Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Accumulated benefit obligation - beginning of year Accumulated benefit obligation - end of year Defined Benefit Plan, Benefit Obligation Total ACL, Individually evaluated for impairment Financing Receivable Allowance For Credit Loss And Off-Balance Sheet Credit Loss Liability, Individually Evaluated For Impairment Financing Receivable Allowance For Credit Loss And Off-Balance Sheet Credit Loss Liability, Individually Evaluated For Impairment Entity Current Reporting Status Entity Current Reporting Status 2023 Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year Three Executive officers, certain key employees, and board of directors Executive Officers, Certain Key Employees, Board Of Directors [Member] Executive Officers, Certain Key Employees, Board Of Directors [Member] Amounts included in earnings - fair value adjustments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Available-for-sale debt securities Debt Securities Available- for-Sale Available-for-sale Securities [Member] Derivative Assets Derivative Asset [Abstract] Goodwill and other intangible assets, net Total goodwill and other intangible assets, net Intangible Assets, Net (Including Goodwill) Purchases Payments to Acquire Debt Securities, Available-for-sale Earnings Per Common Share Earnings Per Share, Policy [Policy Text Block] Retirement Plan Funding Status [Axis] Defined Benefit Plan, Funding Status [Axis] Other Other Income Contractually specified servicing fees earned by United on servicing rights Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Cash Flow [Line Items] Cash Flow [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Common stock issued (in shares) Common Stock, Shares, Issued ACL Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Provision for Loan Losses Schedule of Impaired Financing Receivable [Table] Schedule of Impaired Financing Receivable [Table] Operating lease liability Present value of lease liability Operating Lease, Liability Total allowance for credit losses, 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 Realized losses reclassified from AOCI into net income Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net Schedule of Servicing Assets at Fair Value [Table] Schedule of Servicing Assets at Fair Value [Table] Summary of Significant Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Debt Instrument [Line Items] Debt Instrument [Line Items] Total shareholders’ equity Beginning balance Ending balance Reduction in equity Shareholders’ equity Stockholders' Equity Attributable to Parent Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Total consideration Total fair value of consideration transferred Business Combination, Consideration Transferred Shares issued in acquisition (in shares) Common stock issued (in shares) Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Repayment of long-term debt Repayments of Other Long-term Debt Entity Address, City or Town Entity Address, City or Town Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Restricted Stock Units Restricted stock units Restricted Stock Units (RSUs) [Member] Total time deposits Time Deposits Schedule of derivative financial instruments on consolidated balance sheet Schedule of Interest Rate Derivatives [Table Text Block] Bank owned life insurance Bank Owned Life Insurance 2025 Lessee, Operating Lease, Liability, to be Paid, Year Five Financial Instrument [Axis] Financial Instrument [Axis] Par Value Financing Receivable, Purchased with Credit Deterioration, Amount at Par Value Type of Adoption [Domain] Accounting Standards Update [Domain] Nonrecurring Adjustment [Axis] Nonrecurring Adjustment [Axis] Amendments to defined benefit pension plan, Tax (Expense) Benefit Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Tax Begin to expire in 2021 Net Operating Loss Carry Forwards Begin To Expire In Two Zero Two One [Member] Net Operating Loss Carry Forwards Begin To Expire In Two Zero Two One [Member] Short-term lease cost Short-term Lease, Cost Net actuarial gain (loss) on defined benefit pension plans, Tax (Expense) Benefit Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax Held-to-Maturity, Amortized Cost, More than 10 years Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] 2023 Time Deposit Maturities, Year Three CET1 capital Banking Regulation, Common Equity Tier One Risk-Based Capital, Actual Less valuation allowance Valuation allowance Deferred Tax Assets, Valuation Allowance True tax leases Deferred Tax Liabilities, Leasing Arrangements Liabilities: Liabilities [Abstract] 2024 Time Deposit Maturities, Year Four Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Derivative assets & liabilities - other Derivative Assets And Liabilities Other [Member] Derivative Assets And Liabilities Other 2023 Finite-Lived Intangible Asset, Expected Amortization, Year Three Construction in progress Construction in Progress [Member] Revenue from Contracts with Customers Revenue from Contract with Customer [Policy Text Block] Commercial & industrial Commercial And Industrial Classification [Member] Commercial And Industrial Classification[Member] Total loans, excluding PCI loans Financing Receivable, Before Allowance For Credit Loss, Excluding Purchased Credit Impaired Loans Financing Receivable, Before Allowance For Credit Loss, Excluding Purchased Credit Impaired Loans 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 Leases [Abstract] Leases [Abstract] Reclassification adjustment for losses (gains) recognized in net income, Tax (Expense) Benefit Income tax expense (benefit) attributable to sales Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Other Other expense Other Noninterest Expense Funded Plan United-Palmetto Funded Plan [Member] United-Palmetto Funded Plan [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Short-term borrowings Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Short Term Borrowings Represents amount of Short-term borrowings recognized as of the acquisition date. 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. Life (years) Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Weighted Average Life Number of derivative contracts Number of Interest Rate Derivatives Held Net operating loss carryforwards Operating Loss Carryforwards Income per common share: Earnings Per Share [Abstract] Earnings Per Share [Abstract] Net interest revenue after provision for credit losses Interest Income (Expense), after Provision for Loan Loss Condensed Financial Statements of United Community Banks, Inc. (Holding Company Only) Condensed Financial Information of Parent Company Only Disclosure [Text Block] Schedule of summarizes the sources and expected tax consequences of future taxable deductions (revenue) Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Net investment in leases Net investment in leases Net Investment in Lease Reclassifications related to defined benefit pension plan activity Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Derivative assets Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Derivative Assets Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Derivative Assets 2016 Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year Shareholders' equity: Stockholders' Equity Attributable to Parent [Abstract] Net assets acquired Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed) 2025 Finite-Lived Intangible Asset, Expected Amortization, Year Five Document Fiscal Period Focus Document Fiscal Period Focus Termination of defined benefit pension plan, Net of Tax Amount Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax Loans and Leases Financing Receivable [Policy Text Block] United contributions to the plan Employer contribution Defined Benefit Plan, Plan Assets, Contributions by Employer Loans receivable Loans Receivable [Member] Entity Filer Category Entity Filer Category Common stock, par value $1 per share Common Stock Common Stock [Member] Product and Service [Domain] Product and Service [Domain] Preferred stock, $1 par value: 10,000,000 shares authorized; Series I, $25,000 per share liquidation preference; 4,000 and no shares issued and outstanding, respectively Preferred stock carrying amount Preferred Stock, Including Additional Paid in Capital, Net of Discount Net cash flow hedge activity, Net of Tax Amount Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Guaranteed portion of SBA/USDA loans SBA USDA Guaranteed Loans [Member] SBA USDA Guaranteed Loans [Member] Allowance for credit losses - loans, Initial ACL - PCD loans Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Table] Schedule of details regarding amounts reclassified out of AOCI Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Compensation expense related to 401(k) Plan Defined Contribution Plan, Cost Held-to-Maturity, Amortized Cost Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract] Derivative liabilities Derivative Financial Instruments, Liabilities [Member] PCD loans: Financing Receivable, Purchased with Credit Deterioration, Amount at Purchase Price [Abstract] Shared service fees from subsidiaries Shared Service Fees From Subsidiaries Shared Service Fees From Subsidiaries TDRs Modified Within the Year That Have Subsequently Defaulted, Recorded Investment Financing Receivable, Troubled Debt Restructuring, Subsequent Default Interest Rate (percent) Debt Instrument, Interest Rate, Stated Percentage Southern Bancorp Capital Trust I Southern Bancorp Capital Trust One [Member] Represents information of Southern bancorp capital trust I. Loans and leases held for investment Total loans Total Financing Receivable, before Allowance for Credit Loss Vested / Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Net change in cash and cash equivalents, including restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Minimum future lease payments expected to be received Sales-type and Direct Financing Leases, Lease Receivable, Fiscal Year Maturity [Abstract] Mergers and Acquisitions Business Combination Disclosure [Text Block] Unrealized holding gains (losses) arising during period, Before-tax Amount OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax Measurement period adjustment increase to cash and cash equivalents Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Cash And Cash Equivalents Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Cash And Cash Equivalents Preferred stock dividends Dividends, Preferred Stock Options Stock options Share-based Payment Arrangement, Option [Member] Recognized on hedged items Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge Reserve for losses on foreclosed properties Deferred Tax Assets Reserve for Losses on Foreclosed Properties Amount before allocation of valuation allowances of deferred tax asset attributable to deductible Reserve for losses on foreclosed properties. Nonaccrual loans with an allowance Financing Receivable, Nonaccrual, With Allowance Amount of financing receivable on nonaccrual status with an allowance for credit loss. Uncertain tax positions Deferred Tax Liability Uncertain Tax Positions This element represents amount of deferred tax liability uncertain tax position. Debt securities available for sale: Debt Securities, Available-for-sale [Abstract] Condensed Financial Information Disclosure [Abstract] Condensed Financial Information Disclosure [Abstract] Subsequent Events [Abstract] Subsequent Events [Abstract] Fair Value, Less than 12 Months Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value Number of debt securities available for sale in unrealized loss position Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions Loan Restructuring Modification [Domain] Loan Restructuring Modification [Domain] Cash dividend from Bank paid to Holding Company Dividends from bank Dividend Income, Received From Consolidated Subsidiaries, Bank Dividend Income, Received From Consolidated Subsidiaries, Bank Other-than-temporary impairment charges Other than Temporary Impairment Losses, Investments Interest Interest Paid, Excluding Capitalized Interest, Operating Activities Held-to-Maturity, 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 Financing Receivable, Past Due [Line Items] Financing Receivable, Past Due [Line Items] Owner occupied commercial real estate Owner Occupied Commercial Real Estate [Member] Represents information of owner occupied commercial real estate. Capital surplus Additional Paid in Capital 2021 Finite-Lived Intangible Asset, Expected Amortization, Year One Total revenue Revenues Class of Stock [Axis] Class of Stock [Axis] Income taxes Income Taxes Paid, Net New Accounting Pronouncements or Change in Accounting Principle [Table] Accounting Standards Update and Change in Accounting Principle [Table] Unrealized holding losses on derivatives arising during the period, Tax (Expense) Benefit Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax Total liabilities Financial and Nonfinancial Liabilities, Fair Value Disclosure Residential mortgage Residential mortgage servicing rights Residential Mortgage [Member] Common stock issuable (in shares) Common Stock Issuable, Shares Represents number of shares of common stock issuable. Proceeds from issuance of Series I preferred stock, net of issuance costs Net proceeds from issuance of preferred stock Proceeds from Issuance of Preferred Stock and Preference Stock Diluted (in dollars per share) Earnings Per Share, Diluted Proceeds from sales Proceeds from sales Proceeds from Sale of Debt Securities, Available-for-sale 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 Schedule of reconciliation of the beginning and ending unrecognized tax benefit related to uncertain tax positions Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Purchase price Financing Receivable, Purchased with Credit Deterioration, Amount at Purchase Price Common stock issued in acquisition Common stock issued Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Goodwill and Other Intangible Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Adjustment to reserve for uncertain tax positions Income Tax Reconciliation Change in Reserves for Uncertain Tax Positions This element represents amount of income tax reconciliation change in reserves for uncertain tax positions. Schedule of long-term debt Schedule of Long-term Debt Instruments [Table Text Block] Nonaccrual loans with no allowance Financing Receivable, Nonaccrual, No Allowance Entity Address, Address Line One Entity Address, Address Line One Tax credit investments Effective Income Tax Rate Reconciliation, Tax Credit, Amount Prime Rate Prime Rate [Member] Entity Emerging Growth Company Entity Emerging Growth Company Supplemental consolidated pro forma revenue Business Acquisition, Pro Forma Revenue Deferred income tax expense Deferred Income Tax Expense (Benefit) Total capital Banking Regulation, Total Capital, Actual Derivative financial instruments Total gross derivative instruments Derivative Liability, Fair Value, Gross Liability Accrued interest receivable Accrued Investment Income Receivable 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 Servicing Assets and Liabilities Transfers and Servicing of Financial Assets [Text Block] Less: accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization ACL at acquisition Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date Tidelands Statutory Trust I Tidelands Statutory Trust One [Member] Represents information of Tidelands statutory trust one. Maximum High Maximum [Member] Preferred stock authorized (in shares) Preferred Stock, Shares Authorized Nonqualified share based compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Loans held for sale at fair value Loans Held-for-sale, Fair Value Disclosure Common stock dividends Dividends, Common Stock, Cash Net cash flow hedge activity, Before-tax Amount Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax Expired (in dollars per share) Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Expired, Weighted Average Grant Date Fair Value Represents the weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. Changes in balance of accretable yield for PCI loans Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward] 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] Estimated prior service costs to be amortized in next fiscal year Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] 2017 Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year Trading Symbol Trading Symbol Schedule of condensed balance sheets Condensed Balance Sheet [Table Text Block] Computation of basic and diluted earnings per share Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Salaries and employee benefits expense Salaries And Employee Benefits [Member] Salaries And Employee Benefits [Member] Construction Construction Loans Construction Loans [Member] 2028 subordinated debentures Two Thousand Twenty Eight Subordinated Debentures [Member] Represents information of 2028 subordinated debentures. Purchase accounting premium Sales Type And Direct Financing Leases, Purchase Accounting Premium Sales Type And Direct Financing Leases, Purchase Accounting Premium Interest-bearing deposits Interest-bearing Deposit Liabilities Held-to-Maturity, Amortized Cost, Not due at single maturity Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Amortized Cost Contractual maturities of time deposits Time Deposits, Fiscal Year Maturity [Abstract] Entity Shell Company Entity Shell Company Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Recurring Fair Value, Recurring [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. 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Dealer offsets to bifurcated embedded derivatives Dealer Offsets To Bifurcated Embedded Derivatives [Member] Represents the dealer offsets to bifurcated embedded derivatives. Investment in limited partnerships Investment In Limited Partnerships Represents investment in limited partnerships. Changes in carrying amount of goodwill Goodwill [Roll Forward] Financial Asset, Aging [Domain] Financial Asset, Period Past Due [Domain] Premises and equipments Property, Plant and Equipment, Net, by Type [Abstract] Schedule of computation of basic and diluted net income per common share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Minimum nonaccrual loan relationships for reserve evaluation Minimum Nonaccrual Loan Amount Needed for Evaluation of Specific Reserves This element represents minimum nonaccrual loan amount needed for evaluation of specific reserves. 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Schedule of contractual maturities of time deposits, including brokered time deposits Time Deposit Maturities [Table Text Block] Gross Unrealized Gains Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Statement of Cash Flows [Abstract] Statement of Cash Flows Statement of Cash Flows [Abstract] Supplemental consolidated pro forma net income (loss) Business Acquisition, Pro Forma Net Income (Loss) Hedge Accounting Basis Adjustment Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) Amounts included in earnings - fair value adjustments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Entity Listings [Table] Entity Listings [Table] Income Statement Location [Axis] Income Statement Location [Axis] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Noninterest income: Noninterest Income [Abstract] 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 Gross contractual amounts receivable Business Combination, Acquired Receivables, Gross Contractual Amount Notional Amount Aggregate notional amount Derivative, Notional Amount Amortization of intangibles Amortization of Intangible Assets Cash and cash equivalents Cash, Cash Equivalents, and Federal Funds Sold Amendments to defined benefit pension plan, Before-tax Amount Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax Derivative assets - customer derivative positions Derivative Assets Customer Derivative Positions [Member] Derivative Assets Customer Derivative Positions Estimated residual value of leased equipment Sales Type And Direct Financing Leases, Unguaranteed Residual Asset Sales Type And Direct Financing Leases, Unguaranteed Residual Asset Other liabilities Other Liabilities Issuance of preferred stock Stock Issued During Period, Value, New Issues Termination of Funded Plan Accumulated Defined Benefit Plans Adjustment, Net Loss On Plan Termination [Member] Accumulated Defined Benefit Plans Adjustment, Net Loss On Plan Termination [Member] Funded Plan Defined Benefit Plan, Funded Plan [Member] Gains from other loan sales, net Gain (Loss) on Sales of Loans, Net Scenario [Axis] Scenario [Axis] Loans Past Due Financing Receivable, 90 Days or More Past Due, Still Accruing Tier 1 leverage ratio Banking Regulation, Tier One Leverage Capital Ratio, Actual Unamortized pension actuarial losses and prior service cost Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions Title of 12(b) Security Title of 12(b) Security Loan purchase accounting adjustments Deferred Tax Assets Loan Purchase Accounting Adjustment Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from loan purchase accounting adjustment. Net core deposit intangible Finite-Lived Intangible Assets, Net Schedule of additional information related to acquired loan portfolio Additional Information Related To Acquired Loan [Table Text Block] Tabular disclosure of the amounts recognized as additional information related to the acquired loan. 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These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Less allowance for credit losses - loans and leases Increase in ACL for loans Less ACL - loans Allowance for credit losses - loans, Beginning Balance Allowance for credit losses - loans, Ending Balance Allowance for Credit Losses, Ending balance Financing Receivable, Allowance for Credit Loss Less: Amounts subject to master netting agreements Derivative Asset, Not Offset, Policy Election Deduction Outstanding, Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding Gross gains on sales Debt Securities, Available-for-sale, Realized Gain Transferred to foreclosed property Real Estate Owned, Transfer to Real Estate Owned Debt Instrument [Axis] Debt Instrument [Axis] Fair value hedging of interest rate risk Fair value hedge Fair Value Hedging [Member] Short-term borrowings Interest Expense, Other Short-term Borrowings Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Gross additional interest income that would have been earned if the nonaccrual loans had performed as per original term Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans Class of Stock [Line Items] Class of Stock [Line Items] Derivative financial instruments Derivative Liability Trust preferred securities Trust Preferred Securities [Member] Represents information of trust preferred securities. 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Unpaid Principal Balance Impaired Financing Receivable, Unpaid Principal Balance Derivative Asset Derivative Asset [Member] Represents Derivative Asset. 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ASU No. 2016-13 Accounting Standards Update 2016-13 [Member] Accounting Policies [Table] Accounting Policies [Table] Represents information of accounting policies of the organization. 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Modified Retirement Plan Modified Retirement Plan [Member] Represents information about Modified Retirement Plan. Compensation expense Share-based Payment Arrangement, Expense Realized gains (losses) on available-for-sale securities AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] Begin to expire in 2027 Net Operating Loss Carry Forwards Begin To Expire In Two Zero Two Seven [Member] Represents information of net operating loss carryforwards begin to expire in 2027. Gross margin Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Weighted Average Gross Margin Represents servicing assets and servicing liabilities at fair value assumptions used to estimate fair value weighted average gross margin. 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Servicing liabilities Servicing Liability Schedule of the contract amount of off-balance sheet instruments Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Service charges and other related fees Noninterest Income, Other Interest expense Interest Expense [Member] Cash flow hedge Interest Rate Cash Flow Hedge Liability at Fair Value Cash and due from banks Cash and Due from Banks Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Rent expense in accordance with ASC 840 Operating Leases, Rent Expense, Net Net income (expense) recognized on fair value hedges Gain (Loss) on Fair Value Hedges Recognized in Earnings Plan amendments Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment Total liabilities and shareholders’ equity Liabilities and Equity Mortgage loan gains and other related fees Fair Value, Option, Changes in Fair Value, Gain (Loss) Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Income Taxes Income Tax Disclosure [Text Block] Merger-related and other charges Merger Related And Other Charges [Member] Represents merger related and other charges. 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Net unrealized gains (losses), Net of Tax Amount OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax Schedule of estimated future benefit payments expected to be paid Schedule of Expected Benefit Payments [Table Text Block] Premises and equipment, net Premises and equipment, net Property, Plant and Equipment, Net Losses on active cash flow hedging relationships: Effect of Cash Flow Hedges on Results of Operations [Abstract] Less: Cash collateral received/pledged Derivative Asset, Fair Value of Collateral Entity Tax Identification Number Entity Tax Identification Number Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Watch Watch Watch [Member] Represents watch. 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Structure Extended Maturity [Member] Debt securities held-to-maturity (fair value $437,193 and $287,904, respectively) Amortized Cost Debt Securities, Held-to-maturity Net defined benefit pension plan activity, Before-tax Amount Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent Options, Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Loans, net Loans Receivable, Fair Value Disclosure Derivatives designated as hedging instruments Derivative Instruments in Hedges, Assets, at Fair Value Holding Company Parent Company [Member] Liabilities: Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Allowance for Credit Losses, Collectively evaluated for impairment Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Net defined benefit pension plan activity, Net of Tax Amount Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent Vested, Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested Investment in partnerships Deferred Tax Assets, Investments 2020 Financing Receivable, Year One, Originated, Current Fiscal Year Supplemental disclosures of cash flow information: Supplemental Cash Flow Information [Abstract] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Financial instruments Unused Commitments to Extend Credit Shares issued through ESPP (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Tier 1 leverage ratio, Well Capitalized Banking Regulation, Tier One Leverage Capital Ratio, Well Capitalized, Minimum Transfers into Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3 Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Property, Plant and Equipment, Type [Domain] Long-Lived Tangible Asset [Domain] Commercial mortgage-backed, 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. Net cash flow hedge activity, Tax (Expense) Benefit Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax, Parent Increase in ACL for unfunded commitments Allowance for unfunded commitments, Beginning Balance Allowance for unfunded commitments, Ending Balance ACL - unfunded commitments, Ending Balance Off-Balance Sheet, Credit Loss, Liability Benefits paid Defined Benefit Plan, Benefit Obligation, Benefits Paid Other comprehensive income Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) Three Shores Three Shores Bancorporation, Inc. [Member] Three Shores Bancorporation, Inc. 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(Increase) decrease in other assets and accrued interest receivable Other assets Increase (Decrease) in Other Operating Assets FMBT First Madison Acquisition [Member] First Madison Acquisition [Member] Reclassification of losses on derivative instruments realized in net income, Tax (Expense) Benefit Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax Schedule Of Servicing Asset [Table] Schedule Of Servicing Asset [Table] Represents the tabular information of servicing asset. Award Type [Axis] Award Type [Axis] Restricted Stock Units, 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] Discount rate for net periodic benefit cost (percent) Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] ACL - Loans Financing Receivable, Allowance for Credit Losses, Policy for Uncollectible Amounts [Policy Text Block] Other assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] Retained Earnings (Accumulated Deficit) Retained earnings Retained Earnings [Member] Preferred stock outstanding (in shares) Preferred Stock, Shares Outstanding Measurement Basis [Axis] Measurement Basis [Axis] Other noninterest income Other noninterest income Other Noninterest Income [Member] Information of other noninterest income [Member] Securities purchase accounting adjustments Deferred Tax Liabilities, Securities Purchase Accounting Adjustments Deferred Tax Liabilities, Securities Purchase Accounting Adjustments Recorded Investment, With no related ACL recorded Impaired Financing Receivable, with No Related Allowance, Recorded Investment Allowance for credit losses - loans, Charge-Offs Financing Receivable, Allowance for Credit Loss, Writeoff Schedule of components of net periodic benefit cost and other amounts recognized in other comprehensive income Schedule of Net Benefit Costs [Table Text Block] Total ACL, PCI Financing Receivable Allowance For Credit Loss And Off-Balance Sheet Credit Loss Liability, PCI Financing Receivable Allowance For Credit Loss And Off-Balance Sheet Credit Loss Liability, PCI Net cash (used in) provided by investing activities Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities Total Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received Deposits Deposit Balance Sheet Account [Member] Deposit Balance Sheet Account [Member] Award Type [Domain] Award Type [Domain] BOLI Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Bank Owned Life Insurance Represents amount of Bank owned life insurance recognized as of the acquisition date. Estimate of contractual cash flows not expected to be collected Business Combination, Acquired Receivables, Estimated Uncollectible Schedule of balance and activity in the ACL by portfolio segment Financing Receivable, Allowance for Credit Loss [Table Text Block] Accretion Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Accretion Corporate bonds Corporate Debt Securities [Member] Commitments to extend credit Commitments to Extend Credit [Member] Schedule of changes in SBA/USDA servicing rights Schedule of Servicing Assets at Fair Value [Table Text Block] Loans Past Due, 60 - 89 Days Financial Asset, 60 to 89 Days Past Due [Member] 20% adverse change Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 20 Percent Adverse Change in Prepayment Speed Transfers and Servicing [Abstract] Transfers and Servicing [Abstract] Premises and Equipment Property, Plant and Equipment Disclosure [Text Block] Fair value hedge Fair Value Hedge Assets Defined benefit plan Pension Plan [Member] Earnings Per Share Earnings Per Share [Text Block] Interest expense: Interest Expense [Abstract] Valuation technique Fair Value Measurements, Valuation Processes, Description Discount rate for disclosures (percent) Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate SBA/USDA loans Loans Insured or Guaranteed by US Government Authorities [Member] Accounting Standards Updates and Recently Adopted Standards New Accounting Pronouncements, Policy [Policy Text Block] Mortgage loans held for sale Fair value Mortgages Held-for-sale, Fair Value Disclosure Credit Loss Status [Axis] Credit Loss Status [Axis] Statement of Financial Position [Abstract] Balance Sheet Statement of Financial Position [Abstract] Unpaid Principal Balance Impaired Financing Receivable, Unpaid Principal Balance [Abstract] Derivative liabilities Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Noncurrent Liabilities, Derivatives Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Noncurrent Liabilities, Derivatives