Securities held to maturity transferred to available for sale Securities held to maturity transferred to available for sale Securities held to maturity transferred to available for sale Proceeds from calls of securities held to maturity Proceeds From Calls Of Held-To-Maturity Securities Proceeds From Calls Of Held-To-Maturity Securities Level 3 inputs Fair Value, Inputs, Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Total non-performing loans Non Performing Loans Total Total non performing loans. Held-to-maturity, greater than ten years, fair value Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value Purchases of securities: Payments to Acquire Investments [Abstract] Real Estate [Domain] Real Estate [Domain] Tier 1 risk-based capital required for minimum capital adequacy, fully phased-in, ratio Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets, Fully Phased-In Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets, Fully Phased-In 2021 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months Securities reclassified from held to maturity to available for sale Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Net of Tax Held-to-maturity, five to ten years, amortized cost Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost Proceeds from sale of commercial loans Proceeds from Collection of Finance Receivables Tax exempt interest, net of disallowed interest Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount Derivative liability, notional Amount Derivative Liability, Notional Amount Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Table] Treasury Stock, Shares Treasury stock, shares (in shares) Treasury Stock, Shares Stock awards vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Financing Receivable Financing Receivable [Member] Current Fiscal Year End Date Current Fiscal Year End Date Cumulative Effect, Period Of Adoption [Axis] Cumulative Effect, Period Of Adoption [Axis] Cumulative Effect, Period Of Adoption Derivative [Line Items] Derivative [Line Items] BOLI income Income Tax Reconciliation, Bank Owned Life Insurance Income Income Tax Reconciliation, Bank Owned Life Insurance Income Collateral [Axis] Collateral [Axis] Carrying amount Reported Value Measurement [Member] Tier 1 (core) capital, ratio Tier One Leverage Capital to Average Assets Beginning balance (in shares) Ending balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Debt securities, held-to-maturity, allowance for credit loss Balance at December 31, 2019 Total ACL - HTM at March 31, 2020 Debt Securities, Held-to-maturity, Allowance for Credit Loss Premises and equipment, net Property, Plant and Equipment, Net One-month LIBOR London Interbank Offered Rate (LIBOR) [Member] Accumulated other comprehensive (loss) income AOCI Attributable to Parent [Member] Cover page. Cover [Abstract] Document Type Document Type Period of loan term eligible for inclusion in Tier 2 capital decreases Period Of Loan Term Eligible For Inclusion In Tier Two Capital Decreases Period Of Loan Term Eligible For Inclusion In Tier Two Capital Decreases Gross unrealized losses Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Borrowings Interest Expense, Borrowings Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] Commercial and industrial Commercial and Industrial Sector [Member] Proceeds from calls of securities available for sale Proceeds From Calls Of Available-For-Sale Securities Proceeds From Calls Of Available-For-Sale Securities Forfeited (USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Financial Instrument [Axis] Financial Instrument [Axis] Preferred stock Preferred Stock [Member] Equity [Abstract] Equity [Abstract] Cash dividends paid, preferred (usd per share) Preferred Stock, Dividends, Per Share, Cash Paid Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Residential mortgage Residential Mortgage [Member] Recorded investment, Pre-modification Financing Receivable, Troubled Debt Restructuring, Premodification Commitments and Contingent liabilities (See Note 15. “Commitments and Contingencies”) Commitments and Contingencies Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract] Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract] 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 (Gain) loss on extinguishment of debt Gain (Loss) on Extinguishment of Debt Debt Instrument [Line Items] Debt Instrument [Line Items] Available-for-sale, one year or less, fair value Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value Purchases of low income housing tax credits Payments to Acquire Affordable Housing Tax Credit Payments to Acquire Affordable Housing Tax Credit Proceeds from maturities and other principal payments on securities: Proceeds from Sale, Maturity and Collection of Investments [Abstract] Unused borrowing capacity Debt Instrument, Unused Borrowing Capacity, Amount Held-to-maturity, one year or less, amortized cost Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost Taxi medallions Taxi Medallions [Member] Taxi Medallions Pass Pass [Member] Unrecognized stock-based compensation, non-vested stock awards/performance units Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount One to two years, rate Long Term Debt Maturities Weighted Average Interest Rate In Rolling Year Two Long term debt maturities weighted average interest rate in rolling year two. Treasury stock Treasury Stock [Member] Available for Sale Available for sale: Debt Securities, Available-for-sale [Abstract] Acquired Loan Acquired Loan [Member] Acquired Loan [Member] Other liabilities Other Liabilities [Member] Loans transferred from held for investment to held for sale Financing Receivable, Reclassification to Held-for-sale Treasury stock, at cost (35,412,268 shares at March 31, 2020 and 31,417,601 shares at December 31, 2019) Treasury Stock, Value Sterling National Bank Sterling National Bank [Member] Sterling National Bank [Member] Asset-based lending Asset-Based Lending [Member] Asset-Based Lending [Member] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Charge offs from TDR's Charge Offs From Troubled Debt Restructurings Charge Offs From Troubled Debt Restructurings Tier 1 risk-based capital, actual, capital amount Tier One Risk Based Capital Depositary Shares, Each Representing 1/40th Interest In A Share Of 6.50% Non-Cumulative Perpetual Preferred Stock, Series A Depositary Shares, Each Representing 1/40th Interest In A Share Of 6.50% Non-Cumulative Perpetual Preferred Stock, Series A [Member] Depositary Shares, Each Representing 1/40th Interest In A Share Of 6.50% Non-Cumulative Perpetual Preferred Stock, Series A [Member] Nonperforming loans Nonperforming Financial Instruments [Member] Measurement Frequency [Domain] Measurement Frequency [Domain] Total capital to RWA: Capital [Abstract] Advertising and promotion Marketing and Advertising Expense Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Brokered Deposits [Domain] Brokered Deposits [Domain] Brokered Deposits [Domain] Proceeds from bank owned life insurance Proceeds from Life Insurance Policy Basic (USD per share) Earnings Per Share, Basic Schedule of additional analysis of non-accrual loans Financing Receivable, Nonaccrual [Table Text Block] Beginning balance (USD per share) Ending balance (USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Unpaid principal balance of loans acquired Loans And Leases Receivable, Unpaid Principal Balance Loans And Leases Receivable, Unpaid Principal Balance Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Liabilities assumed: Noncash or Part Noncash Acquisition, Value of Liabilities Assumed [Abstract] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Repurchase agreements Securities Sold under Agreements to Repurchase Stock options outstanding - Weighted average exercise price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Available-for-sale, five to ten years, amortized cost Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost Amortized cost Book value of available-for-sale securities transfered from held to maturity Debt Securities, Available-for-sale, Amortized Cost Income before income tax expense Income before income tax expense Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Net accretion of purchase discount and amortization of net deferred loan costs Accretion (Amortization) of Discounts and Premiums, Loans Accretion (Amortization) of Discounts and Premiums, Loans Total interest expense Interest Expense Unrecognized stock-based compensation, stock options Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount Class of Stock [Axis] Class of Stock [Axis] Savings Deposits, Savings Deposits Plan Name [Domain] Plan Name [Domain] Use of Estimates Use of Estimates, Policy [Policy Text Block] Total borrowings, rate Long-term Debt, Weighted Average Interest Rate, at Point in Time Local Phone Number Local Phone Number Schedule of Classification of Deposits [Line Items] Schedule of Classification of Deposits [Line Items] Schedule of classification of deposits. Number Financing Receivable, Modifications, Number of Contracts Woodforest National Bank Woodforest National Bank [Member] Woodforest National Bank [Member] Average maturity (in years) Derivative, Average Remaining Maturity Other assets Total other assets Other Assets Forfeited (USD per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Held-to-maturity, one to five years, fair value Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value 2018 Financing Receivable, Originated Two Years before Latest Fiscal Year Deposits Deposit Liabilities Disclosures [Text Block] Schedule of Debt Securities Held-For-Sale Allowance for Credit Loss Rollforward Debt Securities, Held-to-maturity, Allowance for Credit Loss [Table Text Block] Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Available-for-sale, with a stated maturity date, fair value Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value Held to Maturity Debt Securities, Held-to-maturity [Abstract] Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash paid for acquisition, net Payments for (Proceeds from) Businesses and Interest in Affiliates Net income Net income Net income Net Income (Loss) Attributable to Parent Efftective tax rate reconciliation: Effective Income Tax Rate Reconciliation, Percent [Abstract] Deposits [Abstract] Deposits [Abstract] Income tax payments Income Taxes Paid Debt Instrument [Axis] Debt Instrument [Axis] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] CMOs/Other MBS CMOs/Other MBS Collateralized Mortgage Obligations [Member] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Held-to-maturity, one year or less, fair value Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value Net non-cash assets acquired Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed) Non-performing loans: Non Performing Assets [Abstract] Non performing assets: Letters of credit Letter of Credit [Member] Stock-based compensation expense Share-based Payment Arrangement, Expense Entity Address, City or Town Entity Address, City or Town Fitch, AA Rating Fitch, AA Rating [Member] Restricted stock compensation expense Restricted Stock or Unit Expense Receivable Type [Axis] Receivable Type [Axis] Summary of activity in allowance for loan losses and recorded investments in loans by portfolio segment based on impairment method Allowance for Loan and Lease Losses [Roll Forward] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Uncertain tax position reserve Effective Income Tax Reconciliation, Uncertain Tax Positions, Amount Effective Income Tax Reconciliation, Uncertain Tax Positions, Amount Impaired financing receivables Impaired Financing Receivables [Table Text Block] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Held to maturity Proceeds From Maturities And Prepayments Of Held-To-Maturity Securities Proceeds From Maturities And Prepayments Of Held-To-Maturity Securities STOCKHOLDERS’ EQUITY: Stockholders' Equity Attributable to Parent [Abstract] Carrying amounts and estimated fair value of financial assets and liabilities Fair Value, by Balance Sheet Grouping [Table Text Block] Interest bearing demand Deposits, Negotiable Order of Withdrawal (NOW) Swap liabilities (see Note 9) Swaps Derivative Liability Greater than five years, rate Long Term Debt Maturities Weighted Average Interest Rate In Rolling After Year Five Long term debt maturities weighted average interest rate in rolling after year five. Impaired loans with an allowance recorded, recorded investment Impaired Financing Receivable, with Related Allowance, Recorded Investment Payroll finance Payroll Finance [Member] Payroll Finance [Member] Schedule of debt Schedule of Debt [Table Text Block] Fair Value, Measurements, Recurring Fair Value, Recurring [Member] With no related allowance recorded: Impaired Financing Receivable, Unpaid Principal Balance [Abstract] Two to three years, amount Long-term Debt, Maturities, Repayments of Principal in Rolling Year Three Non-vested stock awards/performance units Non-vested Stock Awards and Performance Units [Member] Non-vested Stock Awards and Performance Units [Member] Weighted average fixed rate  Derivative, Average Fixed Interest Rate Cash dividends declared, common Dividends, Common Stock, Cash Class of Stock [Line Items] Class of Stock [Line Items] Net gain on called securities Debt and Equity Securities Called, Gain (Loss) Debt and Equity Securities Called, Gain (Loss) Allowance for loan losses activity Financing Receivable, Allowance for Credit Loss [Table Text Block] Originated Loan Originated Loan [Member] Originated Loan [Member] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Accumulated other comprehensive income, net of tax expense of $25,830 at March 31, 2020 and $15,361 at December 31, 2019 Accumulated Other Comprehensive Income (Loss), Net of Tax Brokered Deposits [Axis] Brokered Deposits [Axis] Brokered deposits. Operating cash flows from operating leases Operating Lease, Payments 2016 Financing Receivable, Originated Four Years before Latest Fiscal Year Investment securities available for sale: Investment Securities Available For Sale [Abstract] Investment securities available for sale. Portfolio loan originations, net Payments for Loan originations Cash outflows for the origination of new loans during the period. Provision for credit losses - loans Provision / (credit) Financing Receivable, Credit Loss, Expense (Reversal) LIABILITIES: Liabilities [Abstract] Tier 1 leverage ratio: Tier One Leverage Capital [Abstract] Available for sale Payments to Acquire Debt Securities, Available-for-sale State and local income taxes, net of federal tax benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Gain on sale of residential mortgage loans Gain (Loss) on Sale of Mortgage Loans Public sector finance Public Sector Finance [Member] Public Sector Finance [Member] Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Multi-family Real Estate Commercial Mortgage CBL [Member] Real estate commercial mortgage CBL. Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Increase in cash surrender value of bank owned life insurance Life Insurance, Corporate or Bank Owned, Change in Value Measurement Input Type [Domain] Measurement Input Type [Domain] Multi-family Multifamily [Member] Goodwill Noncash or Part Noncash Acquisition, Goodwill Acquired Noncash or Part Noncash Acquisition, Goodwill Acquired Securities available for sale, at estimated fair value Securities available for sale Fair value of available-for-sale securities transfered from held to maturity Debt Securities, Available-for-sale 3.50% Senior Notes Senior Notes, 3.50% [Member] Senior Notes, 3.50% [Member] Debt Instruments [Abstract] Debt Instruments [Abstract] Redemptions of FHLB and FRB stock, net Payments for (Proceeds from) Federal Home Loan Bank Stock Tier 1 common equity required for minimum capital adequacy, fully phased-in, capital amount Tier One Common Capital Required For Capital Adequacy, Fully Phased-In Tier One Common Capital Required For Capital Adequacy, Fully Phased-In Accrued interest receivable Noncash or Part Noncash Acquisition, Interest Receivable Acquired Noncash or Part Noncash Acquisition, Interest Receivable Acquired Retained earnings Retained Earnings (Accumulated Deficit) Tier 1 (core) capital required for minimum capital adequacy, fully phased-in, capital amount Tier One Leverage Capital Required For Capital Adequacy, Fully Phased-In Tier One Leverage Capital Required For Capital Adequacy, Fully Phased-In Treasury shares repurchased Payments for Repurchase of Common Stock Schedule of Impaired Financing Receivable [Table] Schedule of Impaired Financing Receivable [Table] Document Information [Line Items] Document Information [Line Items] Subordinated Notes - Bank Subordinated notes Subordinated Debt [Member] Entity Tax Identification Number Entity Tax Identification Number Business assets Business Assets [Member] Business Assets Diluted (USD per share) Earnings Per Share, Diluted Tier 1 (core) capital required for minimum capital adequacy, fully phased-in, ratio Tier One Leverage Capital Required For Capital Adequacy To Average Assets, Fully Phased-In Tier One Leverage Capital Required For Capital Adequacy To Average Assets, Fully Phased-In Municipal deposits Municipal Deposits Municipal deposits. Trading Symbol Trading Symbol Minimum Minimum [Member] External Credit Rating by Grouping [Axis] External Credit Rating by Grouping [Axis] Total risk-based capital required for minimum capital adequacy, fully phased-in, ratio Capital Required For Capital Adequacy To Risk Weighted Assets, Fully Phased-In Capital Required For Capital Adequacy To Risk Weighted Assets, Fully Phased-In Occupancy and office operations Occupancy, Net Federal Home Loan Bank advances, loss realized Federal Home Loan Bank Advances, Loss Realized Federal Home Loan Bank Advances, Loss Realized 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Two Legal Entity [Axis] Legal Entity [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Fair value measurement input Impaired Loans, Measurement Input Impaired Loans, Measurement Input Less than one year, rate Long Term Debt Maturities Weighted Average Interest Rate In Next Rolling Twelve Months Long term debt maturities weighted average interest rate in next rolling twelve months. Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Summary of Company's stock option activity Share-based Payment Arrangement, Option, Activity [Table Text Block] Net cash (used in) financing activities Net Cash Provided by (Used in) Financing Activities Amounts reclassified from AOCI Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Income tax (benefit) expense Actual income tax (benefit) expense Income Tax Expense (Benefit) 2021 Lessee, Operating Lease, Liability, Payments, Due Year Two Unpaid principal balance with no related allowance recorded Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance Non-Accrual TDRs Non Accrual Loans Under Troubled debt restructurings Non accrual loans. Held to maturity Payments to Acquire Held-to-maturity Securities Loans evaluated by segment, Individually evaluated for impairment Financing Receivable, Individually Evaluated for Impairment City Area Code City Area Code Other liability balances Other Liabilities, Other Other Liabilities, Other Other intangible assets, net Other intangible assets Intangible Assets, Net (Excluding Goodwill) Title of 12(b) Security Title of 12(b) Security Period past due at time of acquisition to determine PCD classification Financing Receivable, Threshold Period Past Due, Writeoff Loans held for sale Loans Receivable Held-for-sale, Net, Not Part of Disposal Group Total risk-based capital required to be well capitalized, ratio Capital Required to be Well Capitalized to Risk Weighted Assets Total assets Assets, Fair Value Disclosure Customer interest rate swap Customer Interest Rate Swap [Member] Customer interest rate swap. Stock options & other stock transactions, net APIC, Share-based Payment Arrangement, Recognition and Exercise Deferred tax (expense) related to other comprehensive income Other comprehensive income (loss), tax benefit Other Comprehensive Income (Loss), Tax Net unrealized holding gain (loss) on retirement plans Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Award Date [Axis] Award Date [Axis] Third-party interest rate swap Third Party Interest Rate Swap [Member] Third party interest rate swap. ASSETS: Assets [Abstract] Gross unrealized gains Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Schedule of off-balance-sheet financial instruments Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block] Less than one year, amount Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months Loans evaluated for impairment by segment Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] Litigation accrual Loss Contingency Accrual Schedule of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Annual effective tax rate adjustment Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount Unrecognized losses, total Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss Recorded investment, Post-modification Financing Receivable, Troubled Debt Restructuring, Postmodification Performance Shares Performance Shares [Member] Financial Instruments Owned and Pledged as Collateral [Table] Financial Instruments Owned and Pledged as Collateral [Table] Common-equivalent shares due to the dilutive effect of stock options and unvested performance share grants (in shares) Weighted Average Number Diluted Shares Outstanding Adjustment Federal Home Loan Bank (“FHLB”) and Federal Reserve Bank (“FRB”) stock, at cost Federal Home Loan Bank Stock Cash on deposit as swap collateral / net of settlement Cash On Deposit As Swap Collateral And Settlement Cash On Deposit As Swap Collateral And Settlement Measurement Basis [Axis] Measurement Basis [Axis] Total Finite-Lived Intangible Assets, Net Increased borrowing capacity by pledging securities Market Value Of Mortgage Not Required To Be Pledged Market value of mortgage not required to be pledged. Gross realized (losses) Debt Securities, Held To Maturity, Sold, Realized Loss Debt Securities, Held To Maturity, Sold, Realized Loss Unsettled securities transactions Unsettled Securities Transactions Unsettled Securities Transactions Derivative Instrument [Axis] Derivative Instrument [Axis] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Statistical Measurement [Axis] Statistical Measurement [Axis] Supplemental cash flow information: Supplemental Cash Flow Information [Abstract] Accrued interest receivable on securities Accrued Interest Receivables, Securities, Fair Value Disclosure Accrued interest receivables fair value disclosure. 2025 Lessee, Operating Lease, Liability, Payments, Due Year Six Lessee, Operating Lease, Liability, Payments, Due Year Six By period to maturity: Long-term Debt, Rolling Maturity [Abstract] Discounts on acquired loans Business Combination, Provisional Information, Initial Accounting Incomplete, Loans Business Combination, Provisional Information, Initial Accounting Incomplete, Loans Fair value, 12 months or longer Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer Cash dividends declared, preferred Dividends, Preferred Stock, Cash Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Held-to-maturity, with a stated maturity date, amortized cost Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost Net (decrease) in short-term FHLB borrowings Payments Of Short Term FHLBank Borrowings, Financing Activities Payments Of Short Term FHLBank Borrowings, Financing Activities Credit Rating, Fitch [Axis] Credit Rating, Fitch [Axis] Non-interest expense: Noninterest Expense [Abstract] Cash dividends paid - preferred stock Payments of Ordinary Dividends, Preferred Stock and Preference Stock Borrowings Debt Disclosure [Text Block] Loans individually evaluated for impairment by segment of loans Loans Individually Evaluated For Impairment By Segment Of Loans [Abstract] Loans individually evaluated for impairment by segment of loans. Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Financing Receivable, Past Due [Line Items] Financing Receivable, Past Due [Line Items] Schedule of goodwill and intangible assets Schedule of Intangible Assets and Goodwill [Table Text Block] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Total other comprehensive income, before tax Other comprehensive income (loss), before tax Other Comprehensive Income (Loss), before Tax Canceled/expired (in shares) Share-Based Compensation Arrangement By Share-Based Payment Award, Shares Available For Grant, Cancellations in Period Share-Based Compensation Arrangement By Share-Based Payment Award, Shares Available For Grant, Cancellations in Period Entity Central Index Key Entity Central Index Key Prior Financing Receivable, Originated Five or More Years before Latest Fiscal Year Beginning balance (in shares) Ending balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Emerging Growth Company Entity Emerging Growth Company Other liabilities Noncash or Part Noncash Acquisition, Other Liabilities Assumed Other borrowings Other Borrowings Derivative [Table] Derivative [Table] Gross realized gains Debt Securities, Available-for-sale, Realized Gain Total risk-based capital required to be well capitalized, capital amount Capital Required to be Well Capitalized List of Company's Brokered deposits Schedule of List of Brokered Deposits [Table Text Block] Schedule of list of brokered deposits. Level 2 inputs Fair Value, Inputs, Level 2 [Member] Low income housing tax credits and other benefits Effective Income Tax Rate Reconciliation, Tax Credit, Low Income Housing, Amount Effective Income Tax Rate Reconciliation, Tax Credit, Low Income Housing, Amount External Credit Rating by Grouping [Domain] External Credit Rating by Grouping [Domain] Federal Home Loan Bank advances Federal Home Loan Bank Advances Financial Asset, Period Past Due [Domain] Financial Asset, Period Past Due [Domain] Debt Securities, Held-to-maturity [Table] Debt Securities, Held-to-maturity [Table] Net increase (decrease) in transaction, savings and money market deposits Net Change Interest and Noninterest-bearing Deposits, Domestic Fair Value Measurements, Nonrecurring Fair Value, Nonrecurring [Member] Preferred Stock, Shares Issued Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Sale of securities Schedule of Realized Gain (Loss) [Table Text Block] Measurement Input Type [Axis] Measurement Input Type [Axis] Unrecognized stock-based compensation expense Share-based Payment Arrangement, Nonvested Award, Cost [Table Text Block] Originations of loans held for sale Payments for Origination and Purchases of Loans Held-for-sale LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities and Equity [Abstract] Loss on security calls held to maturity Debt Securities, Held-to-maturity, Sold, Realized Gain (Loss) Securities non-taxable Interest Income, Securities, Operating, Tax Exempt 30-59 days past due Financial Asset, 30 to 59 Days Past Due [Member] Non-cash assets acquired: Noncash or Part Noncash Acquisition, Value of Assets Acquired [Abstract] Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Other comprehensive income, net of tax Other comprehensive income (loss) Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax Credit Derivatives Contract Type [Domain] Derivative Contract [Domain] Available-for-sale, five to ten years, fair value Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Net unrealized holding (loss) gain on securities transferred to held to maturity Net Unrealized Holding Gain (Loss) On Securities Transferred To Held-to-maturity [Member] Net Unrealized Holding Gain (Loss) On Securities Transferred To Held-to-maturity [Member] Performance measurement period Share-based Compensation Arrangement by Share-based Payment Award, Award Performance Measurement Period Share-based Compensation Arrangement by Share-based Payment Award, Award Performance Measurement Period Total borrowings, amount Long-term Debt Long-term Debt Proceeds from calls Proceeds from Sale of Held-to-maturity Securities Remainder of 2020 Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 2024 Finite-Lived Intangible Assets, Amortization Expense, Year Four Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Greater than five years, amount Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five Award Date [Domain] Award Date [Domain] Gross unrecognized gains Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain Derivative assets, notional amount Derivative Asset, Notional Amount Bank pledged mortgages Pledged Assets Separately Reported, Loans Pledged as Collateral, at Fair Value Consumer Consumer Loan [Member] Available-for-sale, without single maturity date, amortized cost Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost Stock awards vested (USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value Derivative assets, fair value Swaps Derivative Asset Weighted-average period total unrecognized compensation cost related to non-vested shares granted Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Allowance evaluated by segment, Individually evaluated for impairment Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment Low income housing tax credit investments Amortization Method Qualified Affordable Housing Project Investments Receivable [Domain] Receivable [Domain] Warehouse lending Warehouse Lending [Member] Warehouse lending [Member] Tax at federal statutory rate of 21% Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Schedule of Collateral-Dependent Financing Receivables Schedule Of Collateral-Dependent Financing Receivables [Table Text Block] Schedule Of Collateral-Dependent Financing Receivables Entity Address, Address Line One Entity Address, Address Line One Loans evaluated by segment, Collectively evaluated for impairment Financing Receivable, Collectively Evaluated for Impairment Portfolio loans, net Loans Receivable, Fair Value Disclosure Entity Address, State or Province Entity Address, State or Province Acquisitions: Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed) [Abstract] Schedule of Fair Value, Off-balance Sheet Risks [Table] Schedule of Fair Value, Off-balance Sheet Risks [Table] Unrealized losses, less than 12 months, accumulated loss Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Retirement Benefits [Abstract] Retirement Benefits [Abstract] Net cash provided by investing activities Net Cash Provided by (Used in) Investing Activities Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Deposits Interest Expense, Deposits Fair value, less than 12 months Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value Financial liabilities: Financial Liabilities [Abstract] Financial Liabilities [Abstract] Tier 1 common equity required to be well capitalized, capital amount Common Equity Tier One Capital Required to be Well-Capitalized Proceeds from sale of premises and equipment Proceeds from Sale of Property, Plant, and Equipment Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Summary of derivatives Schedule of Derivative Instruments [Table Text Block] Factored receivables Factored receivables Factored Receivables [Member] A loan related to factored receivables. Increase to allowance for credit losses due to TDR's subsequently defaulted Financing Receivable, Allowance For Credit Loss, Troubled Debt Restructurings, Defaults Financing Receivable, Allowance For Credit Loss, Troubled Debt Restructurings, Defaults Net increase in other borrowings Proceeds from (Repayments of) Other Debt Entity Interactive Data Current Entity Interactive Data Current Common Stock, Shares, Issued Common stock, shares issued (in shares) Common Stock, Shares, Issued Common stock, par value (USD per share) Common Stock, Par or Stated Value Per Share Unused lines of credit Unused lines of Credit [Member] Total securities pledged Restricted Investments Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Cash and due from banks Cash and Due from Banks Bank owned life insurance (“BOLI”) Bank Owned Life Insurance FHLB borrowings Federal Home Loan Bank Borrowings, Fair Value Disclosure Beginning balance (in shares) Ending balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 60-89 days past due Financial Asset, 60 to 89 Days Past Due [Member] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Compensation and benefits Labor and Related Expense Granted (USD per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Other asset balances Other Assets, Other Other Assets, Other Vesting percentage Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Money market Money Market Deposits [Member] Money market deposits. Charge for asset write-downs, retention and severance Asset Impairment, Severance, And Retention Charges Asset Impairment, Severance, And Retention Charges Income tax expense (benefit) on realized net gains / (losses) Tax Expense (Benefit) Of Securities Gains Tax expense (benefit) of securities gains State and municipal US States and Political Subdivisions Debt Securities [Member] Available-for-sale securities Available-for-sale Securities [Member] Accounts receivable management / factoring commissions and other fees Accounts Receivable Management Fees, Factoring Commissions And Other Related Fees Accounts receivable / factoring commissions and other related fees Consolidated Entities [Axis] Consolidated Entities [Axis] 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] Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Common stock (par value $0.01 per share; 310,000,000 shares authorized at March 31, 2020 and December 31, 2019; 229,872,925 shares issued at March 31, 2020 and December 31, 2019; 194,460,656 and 198,455,324 shares outstanding at March 31, 2020 and December 31, 2019, respectively) Common Stock, Value, Issued Allowance for credit losses (“ACL”) - loans Financing Receivable, Change in Method, Credit Loss Expense (Reversal) Financial assets: Financial Assets [Abstract] Financial Assets [Abstract] Stock-based compensation plans Employee Stock Ownership Plan (ESOP) And Stock Based Compensation Expense Employee Stock Ownership Plan (ESOP) And Stock Based Compensation Expense Originated Loans Originated Loans [Member] Originated Loans Real Estate, Type of Property [Axis] Real Estate, Type of Property [Axis] External Credit Rating, Fitch [Domain] External Credit Rating, Fitch [Domain] Income tax expense on realized net gains Tax expense held to maturity security gains Tax expense held to maturity security gains Acquisition, development and construction (“ADC”) Acquisition, Development And Construction [Member] Acquisition Development And Construction [Member] Non-interest income: Noninterest Income [Abstract] Fair value, less than 12 months Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months Basic (in shares) Weighted average common shares outstanding for computation of basic EPS (in shares) Weighted Average Number of Shares Outstanding, Basic Right of use asset for operating leases (see Note 15) Operating Lease, Right-of-Use Asset One to two years, amount Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two ASU 2017-12 Accounting Standards Update 2017-12 [Member] Credit Loss Status [Axis] Credit Loss Status [Axis] Annualized net charge-offs to average loans outstanding: Net Charge Offs To Average Gross Loans Annualized Net charge offs to average gross loans annualized. Equity Components [Axis] Equity Components [Axis] Net deferred tax liability Deferred Tax Liabilities, Net As reported under CECL Cumulative Effect, Period Of Adoption, Adjusted Balance [Member] Cumulative Effect, Period Of Adoption, Adjusted Balance Reclassification of the stranded income tax effects from the enactment of the Tax Cuts and Jobs Act from accumulated other comprehensive (loss) Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect Portfolio loans, net Portfolio loans, net Financing Receivable, after Allowance for Credit Loss Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] ACL - off-balance sheet credit exposures (recorded in other liabilities) Allowance for credit losses - loan commitments Off-Balance Sheet, Credit Loss, Liability Revolving loans Financing Receivable, Revolving Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Allowance for Credit Loss Credit Loss, Financial Instrument [Policy Text Block] Granted (in shares) Share-Based Compensation Arrangement By Share-Based Payment Award, Shares Available For Grant, Granted In Period Share-Based Compensation Arrangement By Share-Based Payment Award, Shares Available For Grant, Granted In Period Held-to-maturity, five to ten years, fair value Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value List of Company's Brokered deposits List of Company's Brokered Deposits [Abstract] List of company's brokered deposits. Net amortization of premiums on securities Accretion (Amortization) of Discounts and Premiums, Investments Available-for-sale, pledged as collateral Debt Securities, Available-for-sale, Restricted Total residential MBS Residential Mortgage Backed Securities [Member] FDIC insurance and regulatory assessments Federal Deposit Insurance Corporation Premium Expense Unrealized losses, total Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss Deferred income tax expense Increase (Decrease) in Deferred Income Taxes Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Schedule of Debt Securities Held-For-Sale Amortized Cost by Credit Quality Indicator Debt Securities, Held-to-maturity, Credit Quality Indicator [Table Text Block] Loans formally in process of foreclosure Mortgage Loans in Process of Foreclosure, Amount Canceled/expired (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Expirations Equipment financing Equipment Financing Receivables [Member] A loan related to equipment finance receivable. Depreciation of premises and equipment Depreciation, Depletion and Amortization Financing Receivable, Allowance for Credit Loss [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] Interest Income Interest Income [Member] Securities pledged for borrowings at FHLB and other institutions, and securities pledged for municipal deposits and other purposes Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block] Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Variable Rate [Axis] Variable Rate [Axis] Purchase of treasury stock Treasury Stock, Value, Acquired, Cost Method 90 days past due Financial Asset, Equal to or Greater than 90 Days Past Due [Member] Document Information [Table] Document Information [Table] Other Other Investment Securities [Member] Other investment securities. Additions for tax positions related to prior tax years Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Mortgage escrow funds Mortgage Escrow Funds Fair Value Disclosure Mortgage escrow funds fair value disclosure. Municipal Deposits Municipal Deposits [Member] Municipal deposits. Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Loans held for sale Loans Held-for-sale, Fair Value Disclosure Non-vested stock awards/stock units outstanding - Number of shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Basis spread Derivative, Basis Spread on Variable Rate Real estate Real Estate Sector [Member] Amortization of premium on certificates of deposit Accretion (Amortization) Of Discounts And Premiums, Certificates Of Deposit Accretion (Amortization) Of Discounts And Premiums, Certificates Of Deposit Net interest income Interest Income (Expense), Net Stock options Share-based Payment Arrangement, Option [Member] Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Corporate and Other Corporate Debt Securities And Other Investment Securities [Member] Corporate Debt Securities And Other Investment Securities Fair value, total Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value Non-maturity deposits Non Maturity Deposits Fair Value Disclosure Non maturity deposits fair value disclosure. Available-for-sale, one to five years, amortized cost Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost Two to three years, rate Long Term Debt Maturities Weighted Average Interest Rate In Rolling Year Three Long term debt maturities weighted average interest rate in rolling year three. Income Statement [Abstract] Income Statement [Abstract] Tier 1 common equity required for minimum capital adequacy, phase-in schedule, ratio Tier One Common Capital Required For Capital Adequacy To Risk Weighted Assets, Fully Phased-In Tier One Common Capital Required For Capital Adequacy To Risk Weighted Assets, Fully Phased-In Tier 1 common equity required to be well capitalized, ratio Tier One Common Capital Required To Be Well Capitalized To Risk Weighted Assets Tier One Common Capital Required To Be Well Capitalized To Risk Weighted Assets Accrued interest payable on deposits Accrued Interest Payable, Deposits Including Escrow, Fair Value Disclosure Accrued Interest Payable, Deposits Including Escrow, Fair Value Disclosure Valuation allowance Deferred Tax Assets, Valuation Allowance Financing Receivable, Collateral-Dependent Loans [Table] Financing Receivable, Collateral-Dependent Loans [Table] Financing Receivable, Collateral-Dependent Loans [Table] Other assets Other Assets [Member] Financial Asset, Other than Financial Asset Acquired with Credit Deterioration Financial Asset, Other than Financial Asset Acquired with Credit Deterioration [Member] Summary of major classification of deposits Schedule Of Major Classification Of Deposits [Table Text Block] Major classification of deposits. Held-to-maturity, without single maturity date, amortized cost Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Amortized Cost Total non-interest income Noninterest Income Held-to-maturity securities pledged as collateral Debt Securities, Held-to-maturity, Restricted Book value of held to maturity securities transfered to available-for-sale Amortized cost Debt Securities, Held-to-maturity Tier 1 (core) capital required to be well capitalized, ratio Tier One Leverage Capital Required to be Well Capitalized to Average Assets Recently Issued Accounting Standards Not Yet Adopted Description of New Accounting Pronouncements Not yet Adopted [Text Block] Securities sold to raise liquidity Debt Securities, Held-to-maturity, Sold, Amount Uncertain tax positions at December 31, 2019 Uncertain tax positions at March 31, 2020 Unrecognized Tax Benefits Number of available for sale securities which were in continuous unrealized loss position for less than 12 months Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Number Of Securities Available for sale securities continuous unrealized loss position less than twelve months number of securities. Total risk-based capital required for minimum capital adequacy, fully phased-in, capital amount Capital Required For Capital Adequacy, Fully Phased-In Capital Required For Capital Adequacy, Fully Phased-In Loans classified as TDRs Past due TDRs Financing Receivable, Troubled Debt Restructuring Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Adoption of New Accounting Standards and Recently Issued Accounting Standards Not Yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] Schedule of Held-to-maturity Securities [Line Items] Schedule of Held-to-maturity Securities [Line Items] Components of loan portfolio, excluding loans held for sale Loans and Leases Receivable, Net Amount [Abstract] Financing receivable credit quality indicators Financing Receivable Credit Quality Indicators [Table Text Block] Net interest income after provision for credit losses Interest Income (Expense), after Provision for Loan Loss Non-interest bearing demand Demand Deposit Accounts Repayment of Senior Notes Repayments of Senior Debt Diluted (in shares) Weighted average common shares for computation of diluted EPS (in shares) Weighted Average Number of Shares Outstanding, Diluted Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restricted stock awards, net (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Summary of securities available for sale Debt Securities, Available-for-sale [Table Text Block] Reclassification adjustment for net realized (gains) losses included in net income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Brokered deposits Noninterest-bearing Domestic Deposit, Brokered Summary of derivatives Summary of Credit Derivatives [Abstract] Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-sale [Line Items] Total assets Assets Derivative Instruments and Hedges, Assets [Abstract] Derivative Instruments and Hedges, Assets [Abstract] Real estate Real Estate [Member] Exercised (USD per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Other, net Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Entity Shell Company Entity Shell Company Present value of lease liabilities Operating Lease, Liability Sterling National Bank Subsidiaries [Member] Variable Rate [Domain] Variable Rate [Domain] Accrued interest payable on borrowings Accrued Interest Payable, Borrowings, Fair Value Disclosure Accrued Interest Payable, Borrowings, Fair Value Disclosure Purchase of treasury stock (in shares) Treasury Stock, Shares, Acquired Total liabilities assumed Noncash or Part Noncash Acquisition, Value of Liabilities Assumed Other Noninterest Income, Other 2023 Lessee, Operating Lease, Liability, Payments, Due Year Four Right-of-use assets obtained in exchange for lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Multi-family Real Estate Loan [Member] Total other securities Securities Investment [Member] Held-to-maturity, without single maturity date, fair value Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value Unrealized losses, 12 months or longer Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Document Quarterly Report Document Quarterly Report Professional fees Professional Fees Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Certificates of deposit Certificates Of Deposit Fair Value Disclosure Certificates of deposit fair value disclosure. Other real estate owned Other Real Estate, Foreclosed Assets, and Repossessed Assets Class of Stock [Domain] Class of Stock [Domain] Exercisable at end of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] Other Total other non-interest expense Other Noninterest Expense Entity File Number Entity File Number EPS(2): Earnings Per Share, Basic and Diluted [Abstract] Senior Notes Senior Notes Senior Notes Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Financing Receivable, Collateral-Dependent Loans [Line Items] Financing Receivable, Collateral-Dependent Loans [Line Items] Financing Receivable, Collateral-Dependent Loans Repayments of term FHLB borrowings Payments of FHLBank Borrowings, Financing Activities Document Fiscal Period Focus Document Fiscal Period Focus Total other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Financial Instruments [Domain] Types of Financial Instruments [Domain] Financial Instruments [Domain] Balance (in shares) Balance (in shares) Shares, Issued Other comprehensive income (loss), before tax: Other Comprehensive Income (Loss), before Tax [Abstract] Net (decrease) increase in certificates of deposit Increase (Decrease) in Time Deposits Basis of Financial Statement Presentation Basis of Presentation and Significant Accounting Policies [Text Block] Stock awards vested (USD 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 Other earning assets Other Interest and Dividend Income Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Goodwill Goodwill Depreciation expense on operating leases Operating Lease, Depreciation Expense Operating Lease, Depreciation Expense Statement [Line Items] Statement [Line Items] Accumulated other comprehensive loss, tax expense (benefit) AOCI Tax, Attributable to Parent Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Loss Unlikely to be Collected Financing Receivable [Member] Stock-based compensation expense, income tax benefit Share-based Payment Arrangement, Expense, Tax Benefit Unrecognized losses, less than 12 months Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Number of held to maturity securities which were in continuous unrealized loss position for less than 12 months Held To Maturity Securities Continuous Loss Position Less Than Twelve Months Number Of Securities Held To Maturity Securities Continuous Loss Position Less Than Twelve Months Number Of Securities Plan Name [Axis] Plan Name [Axis] FDIC insurance premium limitation Effective Income Tax Rate Reconciliation, FDIC Insurance Premium Limitation Effective Income Tax Rate Reconciliation, FDIC Insurance Premium Limitation Net accretion of debt issuance costs and amortization of premium on borrowings Amortization of Debt Discount (Premium) Federal Home Loan Bank Borrowings Federal Home Loan Bank Borrowings [Member] Amendment Flag Amendment Flag Common Stock, Shares, Outstanding Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding 2020 Financing Receivable, Originated in Current Fiscal Year Weighted average common shares: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Level 1 inputs Fair Value, Inputs, Level 1 [Member] Payroll finance and factoring liabilities Payroll Finance And Factoring Liabilities Payroll Finance And Factoring Liabilities Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Cumulative Effect, Period Of Adoption [Domain] Cumulative Effect, Period Of Adoption [Domain] Cumulative Effect, Period Of Adoption Real estate acquired in settlement of loans Real Estate Owned, Transfer to Real Estate Owned Percent of total loan portfolio Percent Of Total Loan Portfolio Percent Of Total Loan Portfolio Other assets Noncash or Part Noncash Acquisition, Other Assets Acquired Fair value, total Debt Securities, Available-for-sale, Unrealized Loss Position Substandard Substandard [Member] Credit Loss Status [Domain] Credit Loss Status [Domain] Asset write-downs, retention and severance compensation and other restructuring charges Restructuring Costs and Asset Impairment Charges Change in the actuarial loss of defined benefit plan and post-retirement benefit plans Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax Provision for credit losses - held to maturity securities Provision for credit loss expense recorded in the quarter ended March 31, 2020 Debt Securities, Held-to-maturity, Credit Loss Expense (Reversal) Weighted average interest rate during period Line of Credit Facility, Interest Rate During Period Recoveries Financing Receivable, Allowance for Credit Loss, Recovery Total lease payments Lessee, Operating Lease, Liability, Payments, Due Total impact of CECL adoption Allowance For Credit Loss, Change In Method, Credit Loss Expense (Reversal) Allowance For Credit Loss, Change In Method, Credit Loss Expense (Reversal) FHLB Borrowings FHLB borrowings Federal Home Loan Bank Advances [Member] Additional paid-in capital Additional Paid in Capital Schedule of stock-based compensation expense associated with stock options and non-vested stock awards Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Accounting Changes and Error Corrections [Abstract] Accounting Changes and Error Corrections [Abstract] Grant of share options (in shares) Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Multi-family Multi-family financing [Member] Multi-family financing [Member] Collateral Collateral Pledged [Member] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Entity Current Reporting Status Entity Current Reporting Status Non-Interest Income and Other Non-Interest Expense Other non-interest expense [Text Block] Other non-interest expense [Text Block] Proceeds from sale of residential mortgage loans Proceeds from Sale of Loans Held-for-investment Net (gain) from write-downs and sales of other real estate owned Gains (Losses) on Sales of Other Real Estate Bank owned life insurance Bank Owned Life Insurance Income Operational losses Operational Loss Operational Loss Common Stock, Par Value $0.01 Per Share Common Stock, Par Value $0.01 Per Share [Member] Common Stock, Par Value $0.01 Per Share [Member] Schedule of Other Non-interest Expense Other non- interest expense [Table Text Block] Other non- interest expense [Table Text Block] Proceeds from stock option exercises Proceeds from Stock Options Exercised Change in unrealized holding gains on securities available for sale Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax Common stock Common Stock [Member] 2025 Finite-Lived Intangible Assets, Amortization Expense, Year Five Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Fitch, A Rating Fitch, A Rating [Member] Fair value, 12 months or longer Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value Smaller Reporting Company Entity Small Business Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] Schedule of debt Long-term Debt, by Category, Current and Noncurrent [Abstract] Accrued interest receivable, reversed against interest income Financing Receivables, Accrued Interest Receivable Financing Receivables, Accrued Interest Receivable Entity Filer Category Entity Filer Category Total loans, net Noncash or Part Noncash Acquisition, Loans and Leases Receivable Acquired Noncash or Part Noncash Acquisition, Loans and Leases Receivable Acquired Common equity tier 1 to RWA: Tier One Common Equity [Abstract] Tier One Common Equity [Abstract] Interest rate swap Interest Rate Swap [Member] Total liabilities and stockholders’ equity Liabilities and Equity Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Certificates of deposits Certificates of Deposit [Member] Preferred stock dividend Preferred Stock Dividends and Other Adjustments Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Tier 1 risk-based capital, ratio Tier One Risk Based Capital to Risk Weighted Assets Recorded investment with no related allowance recorded Impaired Financing Receivable, with No Related Allowance, Recorded Investment Measurement Input, Appraised Value Measurement Input, Appraised Value [Member] Corporate Corporate Debt Securities [Member] Document Fiscal Year Focus Document Fiscal Year Focus Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Proceeds from sales of securities available for sale Proceeds from sales Proceeds from Sale of Debt Securities, Available-for-sale Subordinated Notes - Bank Subordinated Debt Charge-offs Financing Receivable, Allowance for Credit Loss, Writeoff Portfolio Loans Financing Receivables [Text Block] Gain on security calls available for sale Debt Securities, Available-for-sale, Realized Gain (Loss) Stock awards vested (in shares) Share-Based Compensation Arrangement By Share-Based Payment Award, Shares Available For Grant, Vested In Period Share-Based Compensation Arrangement By Share-Based Payment Award, Shares Available For Grant, Vested In Period Net gain on loans held for sale Gain (Loss) on Sales of Loans, Net Residential mortgage loans servicing Residential Loan Servicing Residential Loan Servicing Revolving loans converted to term Financing Receivable, Revolving Converted To Term Financing Receivable, Revolving Converted To Term Interest expense: Interest Expense [Abstract] Schedule of Credit Derivatives [Table] Schedule of Credit Derivatives [Table] Number of held to maturity securities which were in continuous unrealized loss position for 12 months or more Held To Maturity Securities Continuous Loss Position More Than Twelve Months Number Of Securities Held To Maturity Securities Continuous Loss Position More Than Twelve Months Number Of Securities Award Type [Axis] Award Type [Axis] Insurance & surety bond premium Insurance and Surety Bond Premium Expense Insurance and Surety Bond Premium Expense Provisions for credit losses Provision for Loan and Lease Losses ACL - HTM securities Debt Securities, Held-to-maturity, Change in Method, Credit Loss Expense (Reversal) Allowance for credit losses - loans ACL - loans Allowance for credit losses Financing receivable, allowance for credit loss Total allowance for loan losses Beginning balance Ending balance Financing Receivable, Allowance for Credit Loss Held-to-maturity, with a stated maturity date, fair value Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value Number of available for sale securities which were in continuous unrealized loss position for 12 months or more Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Number Of Securities Available for sale securities continuous unrealized loss position twelve months or longer number of securities. Retained earnings Retained Earnings Retained Earnings [Member] New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] Debt Securities, Held-to-maturity, Allowance for Credit Loss [Table] Debt Securities, Held-to-maturity, Allowance for Credit Loss [Table] Document Period End Date Document Period End Date Statement [Table] Statement [Table] Entity Registrant Name Entity Registrant Name Goodwill and Other Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] 2019 Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year Estimated fair value on a recurring basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Consumer portfolio segment Consumer Portfolio Segment [Member] Sterling Bancorp Parent Company [Member] Maximum Maximum [Member] 2022 Lessee, Operating Lease, Liability, Payments, Due Year Three Financing Receivable, Past Due [Table] Financing Receivable, Past Due [Table] Receivables [Abstract] Receivables [Abstract] Other than Temporary Impairment, Credit Losses Recognized in Earnings, Categories of Investments [Domain] Other than Temporary Impairment, Credit Losses Recognized in Earnings, Categories of Investments [Domain] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Impact of CECL adoption Cumulative Effect, Period Of Adoption, Adjustment [Member] Cumulative Effect, Period Of Adoption, Adjustment Net income available to common stockholders Net income available to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Schedule of Classification of Deposits [Table] Schedule of Classification of Deposits [Table] Schedule of classification of deposits. Tier 1 (core) capital, actual, capital amount Tier One Leverage Capital Interest bearing demand Interest-bearing Deposits [Member] Securities available for sale with unrealized losses, by length of time in continuous unrealized loss position Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block] Accretion of net unrealized loss on securities transferred to held to maturity Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) On Securities Transferred To Held To Maturity Arising During Period, before Tax Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) On Securities Transferred To Held To Maturity Arising During Period, before Tax Components of loan portfolio excluding loans held for sale Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Available-for-sale, one year or less, amortized cost Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Debt Securities, Held-to-maturity, Credit Quality Indicator [Table] Debt Securities, Held-to-maturity, Credit Quality Indicator [Table] Fitch, AAA Rating Fitch, AAA Rating [Member] Equity-based stock compensation benefit Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount Stock awards vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares 2026 and thereafter Lessee, Operating Lease, Liability, Payments, Due After Year Six Lessee, Operating Lease, Liability, Payments, Due After Year Six CRE Commercial Real Estate [Member] Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] 2017 Financing Receivable, Originated Three Years before Latest Fiscal Year Statistical Measurement [Domain] Statistical Measurement 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