Organization, Consolidation and Presentation of Financial Statements [Abstract] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Domain] Class of Financing Receivable, Type [Domain] CRE Commercial Real Estate Portfolio Segment [Member] Commercial business loans Commercial Portfolio Segment Two [Member] Commercial portfolio segment two. Consumer loans, including home equity Consumer Portfolio Segment [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Financing Receivable, Allowance for Credit Losses [Line Items] Financing Receivable, Allowance for Credit Losses [Line Items] Number of loan segments Number of Loan Segments Number of Loan Segments Minimum duration past due for impairment review Allowance for Credit Losses, Minimum Duration Past Due for Impairment Review Allowance for Credit Losses, Minimum Duration Past Due for Impairment Review Minimum investment in loan for significance Investment in Loan, Threshold to be Considered Significant Investment in Loan, Threshold to be Considered Significant Percentage of costs to hold and liquidate Allowance for Credit Losses, Percentage of Costs to Hold and Liquidate Allowance for Credit Losses, Percentage of Costs to Hold and Liquidate Duration until re-appraisal Allowance for Credit Losses, Duration Until Reappraisal Allowance for Credit Losses, Duration Until Reappraisal Percentage of loan carrying value used for impairment review Allowance for Credit Losses, Percentage of Loan Carrying Value Used for Impairment Reserve Allowance for Credit Losses, Percentage of Loan Carrying Value Used for Impairment Reserve Duration period past due for charge off Allowance for Credit Losses, Duration Past Due Until Chargeoff Allowance for Credit Losses, Duration Past Due Until Chargeoff Investments, Debt and Equity Securities [Abstract] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] Residential MBS: Residential Mortgage Backed Securities [Member] Schedule of Available-for-sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] Available-for-sale Securities [Abstract] Available-for-sale Securities [Abstract] Amortized cost, One year or less Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis Amortized cost, One to five years Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis Amortized cost, Five to ten years Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis Amortized cost, Greater than ten years Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis Amortized cost, Total other securities Available-for-sale Debt Securities, Amortized Cost Basis Amortized cost, Available for sale securities Available-for-sale Securities, Amortized Cost Basis Fair value, One year or less Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value Fair value, One to five years Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value Fair value, Five to ten years Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value Fair value, Greater than ten years Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value Fair value, Total other securities Available-for-sale Securities, Debt Securities Fair value Available-for-sale Securities Held-to-Maturity Securities [Abstract] Held-to-maturity Securities [Abstract] Amortized cost, One year or less Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount Amortized cost, One to five years Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount Amortized cost, Five to ten years Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount Amortized cost, Greater than ten years Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount Amortized cost, Total other securities Held to Maturity Debt Maturities Net Carrying Amount Held to Maturity Debt Maturities Net Carrying Amount Amortized cost, Held to maturity securities Held-to-maturity Securities Fair value, One year or less Held-to-maturity Securities, Debt Maturities, Next Twelve Months, Fair Value Fair value, One to five years Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Fair Value Fair value, Five to ten years Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value Fair value, Greater than ten years Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value Fair value, Total other securities Held to maturity Debt Maturities Fair value Held to maturity Debt Maturities Fair value Fair value Held-to-maturity Securities, Fair Value Postemployment Benefits [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] Pension Plans United States Pension Plan of US Entity [Member] Other Post Retirement Benefit Plans Other Postretirement Benefit Plan [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Summary of changes in the projected benefit obligation and fair value of plan assets Schedule of Net Funded Status [Table Text Block] Components of the net periodic pension expense (benefit) Schedule of Net Benefit Costs [Table Text Block] Schedule of assumptions used for plan Schedule of Assumptions Used [Table Text Block] Schedule of fair value of plan assets and allocation Schedule of Allocation of Plan Assets [Table Text Block] Schedule of expected benefit payments Schedule of Expected Benefit Payments [Table Text Block] Condensed Financial Information of Parent Company Only Disclosure [Abstract] Condensed Parent Company Financial Statements Condensed Financial Information of Parent Company Only Disclosure [Text Block] Basis of Financial Statement Presentation and Summary of Significant Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Proceeds from sales Proceeds from Sale of Available-for-sale Securities Gross realized gains Available-for-sale Securities, Gross Realized Gains Gross realized losses Available-for-sale Securities, Gross Realized Losses Income tax (benefit) expense on realized net gains (losses) Tax expense of securities gains Tax expense of securities gains Proceeds from sales Proceeds from Sale of Held-to-maturity Securities Gross realized gains Held-to-maturity Securities, Sold Security, Realized Gain (Loss) Income tax expense on realized gains Tax expense held to maturity security gains Tax expense held to maturity security gains Held to maturity securities sold after the company collected principal outstanding balance Held to maturity securities sold after the company collected principal outstanding balance Held to maturity securities sold after the company collected principal outstanding balance Earnings Per Share [Abstract] Earnings Per Common Share Earnings Per Share [Text Block] Property, Plant and Equipment [Abstract] Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Other Non-interest Expense Noninterest Expense, Other [Member] Noninterest Expense, Other [Member] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Land and land improvements Land and Land Improvements [Member] Buildings Building [Member] Leasehold improvements Leasehold Improvements [Member] Furniture, fixtures and equipment Furniture, Fixtures and Equipment [Member] Furniture, Fixtures and Equipment [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Total premises and equipment, gross Property, Plant and Equipment, Gross Accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Total premises and equipment, net Property, Plant and Equipment, Net Depreciation and amortization of premises and equipment Depreciation, Depletion and Amortization Impairment charges on premises and equipment Tangible Asset Impairment Charges Direct acquisition and integration costs Business Combination, Integration Related Costs Receivables [Abstract] Portfolio Loans Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Fair Value Disclosures [Abstract] Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table] Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table] Loan Status [Axis] Loan Status [Axis] Loan Status [Axis] Loan Status [Domain] Loan Status [Domain] Loan Status [Domain] Impaired Impaired [Member] Impaired [Member] Taken in Foreclosure Taken in Foreclosure [Member] Taken in Foreclosure [Member] Weighted Average Weighted Average [Member] Valuation Technique [Axis] Valuation Technique [Axis] Valuation Technique [Domain] Valuation Technique [Domain] Market Approach Valuation Technique Market Approach Valuation Technique [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Nonrecurring Fair Value, Measurements, Nonrecurring [Member] Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] CRE Commercial Real Estate [Member] Residential mortgage Residential Mortgage [Member] ADC Acquisition Development And Construction [Member] Acquisition Development And Construction [Member] Mortgage Servicing Rights Mortgage Servicing Rights [Member] Mortgage Servicing Rights [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Significant Unobservable Inputs Level 3 Fair Value, Inputs, Level 3 [Member] Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] Loans, net Loans Receivable, Fair Value Disclosure Mortgage servicing rights Servicing Asset at Fair Value, Amount Comparability adjustments Fair Value Inputs, Comparability Adjustments Discount rates Fair Value Inputs, Discount Rate Prepayment speed Fair Value, Prepayment Speed Fair Value, Prepayment Speed Schedule of Fair Value, Off-balance Sheet Risks [Table] Schedule of Fair Value, Off-balance Sheet Risks [Table] Financial Instrument [Axis] Financial Instrument [Axis] Types of Financial Instruments [Domain] Financial Instruments [Domain] Letters of credit Letter of Credit [Member] Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] Lending-related instruments Fair Value Disclosure, Off-balance Sheet Risks, Amount, Asset Assets secured by cash as collateral Fair Value Disclosure, Off-balance Sheet Risks, Asset Amount Secured by Cash as Collateral Fair Value Disclosure, Off-balance Sheet Risks, Asset Amount Secured by Cash as Collateral Assets secured by other collateral Fair Value Disclosure, Off-balance Sheet Risks, Asset Amount Secured by Other Collateral Fair Value Disclosure, Off-balance Sheet Risks, Asset Amount Secured by Other Collateral Schedule of Condensed Financial Statements [Table] Condensed Financial Statements [Table] Investment in Subsidiaries by Name [Axis] Investment in Subsidiaries by Name [Axis] Investment in Subsidiaries by Name [Axis] Investment in Subsidiaries by Name [Domain] Investment in Subsidiaries by Name [Domain] [Domain] for Investment in Subsidiaries by Name [Axis] Sterling National Bank Sterling National Bank [Member] Sterling National Bank [Member] Non-bank Subsidiaries Other than Bank Investments [Member] Other than Bank Investments [Member] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Sterling Bancorp Parent Company [Member] Condensed Financial Statements, Captions [Line Items] Condensed Financial Statements, Captions [Line Items] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Net income (loss) Net Income (Loss) Attributable to Parent Adjustments to reconcile net income to net cash provided by (used in) operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Equity in (undistributed) excess distributed earnings Income (Loss) from Equity Method Investments (Gain) on redemption of Subordinated Debentures Gains (Losses) on Extinguishment of Debt Other adjustments (principally net changes in other assets and other liabilities) Other Operating Activities, Cash Flow Statement Net cash provided by (used in) operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Sales of securities Proceeds from Sale and Maturity of Marketable Securities Investment in subsidiaries Payments to Acquire Interest in Subsidiaries and Affiliates ESOP loan principal repayments Proceeds from Repayment of Loans by Employee Stock Ownership Plans Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Net change in other short-term borrowings Proceeds from (Repayments of) Other Debt Redemption of Subordinated Debentures Repayments of Subordinated Debt Equity capital raise Proceeds from Issuance or Sale of Equity Senior Notes offering Proceeds from Issuance of Senior Long-term Debt Cash dividends paid Payments of Dividends Stock-based compensation transactions Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options Other equity transactions Proceeds from Other Equity Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Net increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents at beginning of year Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents at end of year Stockholders' Equity Note [Abstract] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Class of Stock [Line Items] Class of Stock [Line Items] Aggregate dividend capacity without prior regulatory approval Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval Shares available for repurchase program Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased Shares repurchased under repurchase program Stock Repurchased During Period, Shares Liquidation account Liquidation Account Liquidation Account Income Tax Disclosure [Abstract] Components of income tax expense: Components of Income Tax Expense (Benefit), Continuing Operations [Abstract] Current tax expense (benefit): Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Current Federal Tax Expense (Benefit) State Current State and Local Tax Expense (Benefit) Total current tax expense (benefit) Current Income Tax Expense (Benefit) Deferred tax expense (benefit): Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Deferred Federal Income Tax Expense (Benefit) State Deferred State and Local Income Tax Expense (Benefit) Total deferred tax expense (benefit) Deferred Income Tax Expense (Benefit) Income tax expense Income Tax Expense (Benefit) Efftective tax rate reconciliation: Effective Income Tax Rate Reconciliation, Percent [Abstract] Federal statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Tax at federal statutory rate of 35% Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount State and local income taxes, net of federal tax benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Tax-exempt interest, net of disallowed interest Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount BOLI income Income Tax Reconciliation, Bank Owned Life Insurance Income Income Tax Reconciliation, Bank Owned Life Insurance Income Non-deductible acquisition related costs Income Tax Reconciliation, Nondeductible Expense, Acquisition Costs Income Tax Reconciliation, Nondeductible Expense, Acquisition Costs Low income housing tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Low Income Housing, Amount Effective Income Tax Rate Reconciliation, Tax Credit, Low Income Housing, Amount Other, net Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Components of deferred tax assets and liabilities: Components of Deferred Tax Assets and Liabilities [Abstract] Deferred tax assets: Deferred Tax Assets, Net [Abstract] Allowance for loan losses Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts Deferred compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits Other accrued compensation and benefits Deferred Tax Assets, Purchase Accounting Adjustments Deferred Tax Assets, Purchase Accounting Adjustments Accrued post retirement expense Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits Deferred rent Deferred tax assets deferred rent Deferred tax assets deferred rent Intangible assets Deferred Tax Assets, Goodwill and Intangible Assets Other comprehensive loss (securities) Deferred Tax Assets, Other Comprehensive Loss Other comprehensive loss (defined benefit plans) Deferred tax assets, other comprehensive loss- Defined benefit plans Deferred tax assets, other comprehensive loss- Defined benefit plans Depreciation of premises and equipment Deferred Tax Assets, Property, Plant and Equipment State NOL carryforward Deferred Tax Assets, Operating Loss Carryforwards, State and Local Other Deferred Tax Assets, Other Total deferred tax assets Deferred Tax Assets, Gross Deferred tax liabilities: Deferred Tax Liabilities, Net [Abstract] Prepaid pension costs Deferred tax liability prepaid pension cost Deferred tax liability prepaid pension cost Purchase accounting adjustments Deferred Tax Liabilities, Purchase Accounting, Fair Value Adjustments Deferred Tax Liabilities, Purchase Accounting, Fair Value Adjustments Other Deferred Tax Liabilities, Other Total deferred tax liabilities Deferred Tax Liabilities, Gross Net deferred tax asset Deferred Tax Assets, Net Cumulative amount of deferred tax liability not recognized Bad Debt Reserve forTax Purposes of Qualified Lender Provision for federal income tax Provision for federal income tax Provision for federal income tax Unrecorded deferred tax liability Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Bad Debt Reserve for Tax Purposes of Qualified Lender Deposits [Abstract] Non-interest bearing demand Demand Deposit Accounts Interest bearing demand Transaction Accounts Deposits Transaction accounts deposits. Savings Deposits, Savings Deposits Money market Deposits, Money Market Deposits Certificates of deposit Certificates Of Deposit Certificates of deposit. Deposits Deposits Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plan, Asset Categories [Axis] Defined Benefit Plan, Asset Categories [Axis] Plan Asset Categories [Domain] Plan Asset Categories [Domain] Intermediate term bond Fixed Income Funds, Intermediate Term Bond [Member] Fixed Income Funds, Intermediate Term Bond [Member] Long-term bond Fixed Income Funds Long Term Bond [Member] Fixed Income Funds Long Term Bond [Member] Quoted Prices in Active markets for Identical Assets Level 1 Fair Value, Inputs, Level 1 [Member] Significant Other Observable Inputs Level 2 Fair Value, Inputs, Level 2 [Member] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Fair value of plan assets Defined Benefit Plan, Fair Value of Plan Assets Interest income from purchase accounting marks Interest Income, Accretion Of Purchase Accounting Marks Interest Income, Accretion Of Purchase Accounting Marks Maximum loan balance for credit risk to be evaluated on a homogeneous basis Maximum Loan Balance for Credit Risk to be Evaluated on a Homogeneous Basis Maximum Loan Balance for Credit Risk to be Evaluated on a Homogeneous Basis Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Other Income and Expenses [Abstract] Schedule of Other Non-interest Expense Other non- interest expense [Table Text Block] Other non- interest expense [Table Text Block] Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Other Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Debt Instruments [Abstract] Schedule of debt Schedule of Debt [Table Text Block] Components of loan portfolio excluding loans held for sale Components Of Loan Portfolio Excluding Loans Held For Sale [Table Text Block] Components of loan portfolio excluding loans held for sale. Schedule of amounts and status of loans and TDRs Past Due Financing Receivables [Table Text Block] Additional analysis of non-accrual loans Schedule of Financing Receivables, Non Accrual Status [Table Text Block] Impaired financing receivables Impaired Financing Receivables [Table Text Block] Schedule of changes in balance of accretable yield discount for PCI loans Certain Loans Acquired in Transfer Not Accounted For As Debt Securities, Accretable Yield Movement Schedule [Table Text Block] Certain Loans Acquired in Transfer Not Accounted For As Debt Securities, Accretable Yield Movement Schedule [Table Text Block] Troubled debt restructurings Troubled Debt Restructurings on Financing Receivables [Table Text Block] Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common stock Common Stock [Member] Additional paid-in capital Additional Paid-in Capital [Member] Unallocated ESOP shares Unalllocated ESOP shares [Member] Unalllocated ESOP shares [Member] Treasury stock Treasury Stock [Member] Retained earnings Retained Earnings [Member] Accumulated other comprehensive income (loss) AOCI Attributable to Parent [Member] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance Stockholders' Equity Attributable to Parent Balance (shares) Shares, Issued Net income (loss) Other comprehensive (loss) income Other Comprehensive Income (Loss), Net of Tax Common stock issued in Merger transaction Stock Issued During Period, Value, Acquisitions Common stock issued in Merger transaction (shares) Stock Issued During Period, Shares, Acquisitions Stock option & other stock transactions, net Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options Stock option & other stock transactions, net (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Period Increase (Decrease) ESOP shares allocated and ESOP termination Employee Stock Ownership Plan (ESOP), Shares Allocated And Plan Termination, Value Employee Stock Ownership Plan (ESOP), Shares Allocated And Plan Termination ESOP shares allocated and ESOP termination (shares) Employee Stock Ownership Plan (ESOP), Shares Allocated And Plan Termination, Shares Employee Stock Ownership Plan (ESOP), Shares Allocated And Plan Termination, Shares Restricted stock awards, net Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Restricted stock awards, net (shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Common equity issued, net of costs of issuance Stock Issued During Period, Value, New Issues Common equity issued, net of costs of issuance (shares) Stock Issued During Period, Shares, New Issues Cash dividends declared Dividends, Cash Balance Balance (shares) Derivative Instruments and Hedges, Assets [Abstract] Summary of derivatives Schedule of Derivative Instruments [Table Text Block] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Receivables Acquired with Deteriorated Credit Quality [Axis] Receivables Acquired with Deteriorated Credit Quality [Axis] Receivables Acquired with Deteriorated Credit Quality [Domain] Receivables Acquired with Deteriorated Credit Quality [Domain] Receivables acquired with deteriorated credit quality Receivables Acquired with Deteriorated Credit Quality [Member] C&I Commercial And Industrial [Member] A loan, whether secured or unsecured, to a company for purposes such as seasonal working capital needs, inventory financing, equipment purchases and acquisitions. Payroll finance Payroll financing [Member] Payroll financing [Member] Factored receivables Factored Receivables [Member] A loan related to factored receivables. Equipment financing Equipment Financing Receivables [Member] A loan related to equipment finance receivable. Multi-family Multi-family financing [Member] Multi-family financing [Member] Residential mortgage Residential Portfolio Segment [Member] Consumer Consumer Loan [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] PCI loans subject to accretion Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net PCI loans under cost recovery method (non-accrual) Financing Receivable, Recorded Investment, Nonaccrual Status Total PCI loans Financing Receivable, Net Amortized cost of investment securities pledged as collateral Securities pledged as collateral for Derivatives Amortized cost Securities pledged as collateral for Derivatives Amortized cost Fair value of investment securities pledged as collateral Securities Pledged as Collateral for Derivatives at Fair Value Securities Pledged as Collateral for Derivatives at Fair Value Equity [Abstract] Schedule of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Net unrealized holding (loss) gain on available for sale securities Accumulated Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) On Securities Arising During Period, Before Tax Accumulated Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) On Securities Arising During Period, Before Tax Related income tax benefit (expense) Accumulated Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) On Securities Arising During Period, Tax Accumulated Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) On Securities Arising During Period, Tax Available for sale securities AOCI, net of tax Accumulated Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) On Securities Arising During Period, Net Of Tax Accumulated Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) On Securities Arising During Period, Net Of Tax Net unrealized holding loss on securities transferred to held to maturity Accumulated Other Comprehensive Income (Loss), Transfers From Available-for-Sale To Held-to-maturity Securities, Unrealized Holding Gain (Loss), Before Tax Accumulated Other Comprehensive Income (Loss), Transfers From Available-for-Sale To Held-to-maturity Securities, Unrealized Holding Gain (Loss), Before Tax Related income tax benefit Accumulated Other Comprehensive Income (Loss), Transfers From Available-for-Sale To Held-to-maturity Securities, Unrealized Holding Gain (Loss), Tax Accumulated Other Comprehensive Income (Loss), Transfers From Available-for-Sale To Held-to-maturity Securities, Unrealized Holding Gain (Loss), Tax Securities transferred to held to maturity AOCI, net of tax Accumulated Other Comprehensive Income (Loss), Transfers From Available-for-Sale To Held-to-maturity Securities, Unrealized Holding Gain (Loss), Net Of Tax Accumulated Other Comprehensive Income (Loss), Transfers From Available-for-Sale To Held-to-maturity Securities, Unrealized Holding Gain (Loss), Net Of Tax Net unrealized holding loss on retirement plans Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax Related income tax benefit Accumulated Other Comprehensive Income (Loss), Pension And Other Postretirement Benefit Plans, Tax Accumulated Other Comprehensive Income (Loss), Pension And Other Postretirement Benefit Plans, Tax Retirement plan AOCI, net of tax Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward] Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward] Balance at beginning of period Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Acquisition Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Additions Accretion Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion Disposals Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Disposals of Loans Reclassification from non-accretable difference Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference Balance at end of period Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Investment Type [Axis] Investment Type [Axis] Investments [Domain] Investments [Domain] Trust preferred Trust Preferred Securities Subject to Mandatory Redemption [Member] Sterling Bancorp Trust I Sterling Bancorp Trust I [Member] Sterling Bancorp Trust I [Member] Sterling Bancorp Sterling Bancorp [Member] Sterling Bancorp [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Senior Notes Senior Notes [Member] Line of Credit Line of Credit [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility Revolving Credit Facility [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] London Interbank Offered Rate (LIBOR) London Interbank Offered Rate (LIBOR) [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Bank pledged mortgages Pledged Assets Separately Reported, Loans Pledged as Collateral, at Fair Value Increased borrowing capacity by pledging securities Market Value Of Mortgage Not Required To Be Pledged Market value of mortgage not required to be pledged. Federal home loan bank borrowings Federal Home Loan Bank Borrowings, Fair Value Disclosure Long term debt weighted average remaining term Long Term Debt Weighted Average Remaining Term Long term debt weighted average remaining term. Weighted average interest rates Debt, Weighted Average Interest Rate Repurchase agreements maturity Repurchase Agreements, Maturity Period Repurchase Agreements, Maturity Period Long-term debt Long-term Debt Fixed interest rate Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate Private placement discount rate Private placement discount rate Private placement discount rate Cost of issuance Debt Issuance Cost Unamortized discount Debt Instrument, Unamortized Discount Interest expense cost over the life of Senior note Interest expense cost over the life of Senior note Interest expense cost over the life of Senior note Revolving line of credit amount Line of Credit Facility, Maximum Borrowing Capacity Revolving line of credit balance Long-term Line of Credit Required balance Line of Credit Facility, Required Balance Line of Credit Facility, Required Balance Duration of minimum outstanding balance Line of Credit, Required Duration For Minimum Outstanding Balance Line of Credit, Required Duration For Minimum Outstanding Balance Basis spread on one-month LIBOR Debt Instrument, Basis Spread on Variable Rate Proceeds from Issuance of Trust Preferred Securities Proceeds from Issuance of Trust Preferred Securities Percent of Liquidation Amount of Securities and Accumulated and Unpaid Interest Percent of Liquidation Amount of Securities and Accumulated and Unpaid Interest Percent of Liquidation Amount of Securities and Accumulated and Unpaid Interest Gain on extinguishment of debt Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Financing Receivable, Modifications [Line Items] Financing Receivable, Modifications [Line Items] Current loans Trouble Debt restructuring current loans Trouble Debt restructuring current loans 30-59 days past due Thirty To Fifty Nine Days Past Due Under Troubled debt restructurings 30-59 days past due. 60-89 days past due Sixty Eighty To Nine Days Past Due Under Troubled debt restructurings 60-89 days past due. 90 days past due Ninety Plus Days Past Due Under Troubled debt restructurings 90+ days past due. Non- accrual Non Accrual Loans Under Troubled debt restructurings Non accrual loans. Total Total Troubled Debt Restructurings Total TDR's. Condensed Balance Sheets Condensed Balance Sheet [Table Text Block] Condensed Statement of Operations Condensed Income Statement [Table Text Block] Condensed Statements of Cash Flows Condensed Cash Flow Statement [Table Text Block] Number of 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. Number of 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. Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Computation of basic and diluted earnings per share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Business Combinations [Abstract] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Hudson Valley Holding Corp Hudson Valley Holding Corp [Member] Hudson Valley Holding Corp [Member] Damian Services Corporation Damian Services Corporation [Member] Damian Services Corporation [Member] Provident Merger Provident Merger [Member] Provident Merger [Member] Counterparty Name [Axis] Counterparty Name [Axis] Counterparty Name [Domain] Counterparty Name [Domain] FCC, LLC FCC, LLC [Member] FCC, LLC [Member] Merger-related Expenses Business Combination, Acquisition Related Costs [Member] Business Combination, Acquisition Related Costs [Member] Building improvements and equipment Building Improvements And Equipment [Member] Building Improvements And Equipment [Member] Equipment Equipment [Member] Business Aquisition Fair Value Adjustment [Axis] Business Aquisition Fair Value Adjustment [Axis] Business Aquisition Fair Value Adjustment [Axis] Business Acquisition Fair Value Adjustment [Domain] Business Acquisition Fair Value Adjustment [Domain] Business Acquisition Fair Value Adjustment [Domain] Book value Book Value [Member] Book Value [Member] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Core deposits Core Deposits [Member] Customer lists Customer Lists [Member] Trade name Trade Names [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Number of shares each shareholder received from merger Business Combination, Consideration Transferred, Equity Interests Issued And Issuable, Number Of Shares For Each Share Of Acquired Entity's Shares Business Combination, Consideration Transferred, Equity Interests Issued And Issuable, Number Of Shares For Each Share Of Acquired Entity's Shares Number of shares issued in merger Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Share price Share Price Consideration paid Business Combination, Consideration Transferred Goodwill Goodwill Intangibles Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Net assets Net Assets Loans Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Deposits Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits Acquired intangible assets, weighted average useful life Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Premises and equipment, useful life Property, Plant and Equipment, Useful Life Merger related expense Business Combination, Acquisition Related Costs Asset impairments and other restructuring charges Restructuring Costs and Asset Impairment Charges Percentage of voting interests acquired Business Acquisition, Percentage of Voting Interests Acquired Cash paid Payments to Acquire Businesses, Gross Outstanding finance loans acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables Liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Estimated useful life Finite-Lived Intangible Asset, Useful Life Restructuring charge Restructuring Charges Outstanding factoring receivables balance acquired Factored Receivables, Acquired Factored Receivables, Acquired Premium from factored receivables acquired Premium Paid For Factored Receivables Acquired Premium Paid For Factored Receivables Acquired Number of shares each shareholder received from merger Business Acquisition, Number of Shares Received by Acquiree for Each share of Acquiree's Stock Business Acquisition, Number of Shares Received by Acquiree for Each share of Acquiree's Stock Share price of stock issued in merger (in dollars per share) Business Acquisition, Share Price Cash paid for fractional shares Business Combination, Consideration Transferred, Cash Paid for Fractional Shares Business Combination, Consideration Transferred, Cash Paid for Fractional Shares Consideration transferred for outstanding vested stock options Business Combination, Consideration Transferred, Cash Paid for Outstanding Vested Stock Options Business Combination, Consideration Transferred, Cash Paid for Outstanding Vested Stock Options Book value of assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Federal Home Loan Bank (FHLB) stock, at cost Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Federal Home Loan Bank Stock Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Federal Home Loan Bank Stock Borrowings and Senior Notes Debt Disclosure [Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Stock Options Employee Stock Option [Member] Non-vested Stock Awards and Performance Units Non-vested Stock Awards and Performance Units [Member] Non-vested Stock Awards and Performance Units [Member] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] Stock-based compensation expense Allocated Share-based Compensation Expense Stock-based compensation expense, income tax benefit Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Unrecognized stock-based compensation, stock options Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options Unrecognized stock-based compensation, non-vested stock awards/performance units Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options Total unrecognized stock-based compensation expense Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Acquisitions Mergers, Acquisitions and Dispositions Disclosures [Text Block] Accumulated Other Comprehensive (Loss) Income Comprehensive Income (Loss) Note [Text Block] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Reconciliation of Stockholders' Equity to Bank Regulatory Capital Reconciliation of Stockholders' Equity to Bank Regulatory Capital [Table Text Block] Reconciliation of Stockholders' Equity to Bank Regulatory Capital [Table Text Block] Pension and Other Post Retirement Benefits Pension and Other Postretirement Benefits Disclosure [Text Block] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] 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] Income Statement [Abstract] Interest and dividend income: Interest and Dividend Income, Operating [Abstract] Loans, including fees Interest and Fee Income, Loans and Leases Taxable securities Interest Income, Securities, Operating, Taxable Non-taxable securities Interest Income, Securities, Operating, Tax Exempt Other earning assets Other Interest and Dividend Income Total interest and dividend income Interest and Dividend Income, Operating Interest expense: Interest Expense [Abstract] Deposits Interest Expense, Deposits Borrowings Interest Expense, Borrowings Total interest expense Interest Expense Net interest income Interest Income (Expense), Net Provisions for loan losses Provision for Loan and Lease Losses Net interest income after provision for loan losses Interest Income (Expense), after Provision for Loan Loss Non-interest income: Noninterest Income [Abstract] Accounts receivable management / factoring commissions and other related fees Accounts receivable / factoring commissions and other related fees Accounts receivable / factoring commissions and other related fees Mortgage banking income Fees and Commissions, Mortgage Banking Deposit fees and service charges Fees and Commissions Net gain (loss) on sale of securities Gain (Loss) on Sale of Securities, Net Bank owned life insurance Bank Owned Life Insurance Income Investment management fees Investment Advisory, Management and Administrative Fees Other Noninterest Income, Other Total non-interest income Noninterest Income Non-interest expense: Noninterest Expense [Abstract] Compensation and employee benefits Labor and Related Expense Stock-based compensation plans Employee Stock Ownership Plan (ESOP) And Stock Based Compensation Expense Employee Stock Ownership Plan (ESOP) And Stock Based Compensation Expense Occupancy and office operations Occupancy, Net Amortization of intangible assets Amortization of Intangible Assets FDIC insurance and regulatory assessments Federal Deposit Insurance Corporation Premium Expense Other real estate owned (income) expense, net Other Real Estate Owned, Income (Expense), Net Other Real Estate Owned, Income (Expense), Net Defined benefit plan termination charge Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements Other Other Noninterest Expense Total non-interest expense Noninterest Expense Income before income tax expense Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income tax expense Net income Weighted average common shares: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Earnings per common share Basic (USD per share) Earnings Per Share, Basic Diluted (USD per share) Earnings Per Share, Diluted Assets: Assets [Abstract] Cash Securities available for sale Investment in Sterling National Bank Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Investment in non-bank subsidiaries Investment in subsidiaries non bank Investment in subsidiaries non bank Trade name Indefinite-Lived Trade Names Other intangible assets, net Other Intangible Assets, Net Other assets Other Assets Total assets Assets Liabilities: Liabilities [Abstract] Senior Notes Senior Notes Other liabilities Other Liabilities Total liabilities Liabilities Stockholders’ equity Total liabilities and stockholders’ equity Liabilities and Equity Fair value measurements Fair Value Disclosures [Text Block] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Total U.S. GAAP stockholders’ equity Disallowed goodwill and other intangible assets Reconciliation of Stockholders' Equity to Regulatory Capital, Reconciling Items, Intangible Assets (Including Goodwill) Reconciliation of Stockholders' Equity to Regulatory Capital, Reconciling Items, Intangible Assets (Including Goodwill) Net unrealized loss on available for sale securities Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Net accumulated other comprehensive income components Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Tier 1 risk-based capital Tier One Risk Based Capital Allowance for loan losses and off-balance sheet commitments Loans and Leases Receivable, Allowance Total risk-based capital Capital Schedule of recognized amounts of identifiable assets acquired and liabilities assumed Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Schedule of proforma information Business Acquisition, Pro Forma Information [Table Text Block] Purchased credit impaired loans Purchased Credit Impaired Loans [Table Text Block] Purchased Credit Impaired Loans [Table Text Block] Schedule of off-balance-sheet financial instruments Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block] Deposits Deposit Liabilities Disclosures [Text Block] Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Schedule of Components of Income Tax Expense (Benefit) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Quarterly Financial Information Disclosure [Abstract] Business Combination, Separately Recognized Transactions [Table] Business Combination, Separately Recognized Transactions [Table] Business Combination, Separately Recognized Transactions [Axis] Business Combination, Separately Recognized Transactions [Axis] Business Combination, Separately Recognized Transactions [Domain] Business Combination, Separately Recognized Transactions [Domain] Assets Write-down, Retention, and Severance Costs Assets Write-down, Retention, and Severance Costs [Member] Assets Write-down, Retention, and Severance Costs [Member] Business Combination, Separately Recognized Transactions [Line Items] Business Combination, Separately Recognized Transactions [Line Items] Interest and dividend income Interest expense Non-interest income Non-interest expense Recognized charges Business Combination, Separately Recognized Transactions, Expenses and Losses Recognized Other restructuring charges Fair Value, Measurements, Recurring Fair Value, Measurements, Recurring [Member] Changes in fair value recognized on provisions on loans held by the Company Changes In Fair Value Recognized On Provisions On Loans Held By Company Changes in fair value recognized on provisions on loans held by company. Other real estate owned Other Real Estate, Foreclosed Assets, and Repossessed Assets Changes in fair value recognized through income for foreclosed assets held by the Company Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss Included In Income Fair Value Assets Measured On Recurring Basis Change In Unrealized Gain Loss Included In Income Summary of securities available for sale Available-for-sale Securities [Table Text Block] Summary of securities held-to-maturity Held-to-maturity Securities [Table Text Block] Summary of amortized cost and fair value of investment securities available for sale by remaining period to contractual maturity Investments Classified by Contractual Maturity Date [Table Text Block] Sale of securities Sale of Securities [Table Text Block] Sale of Securities [Table Text Block] Securities available for sale with unrealized losses, by length of time in continuous unrealized loss position Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block] Securities held to maturity with unrealized losses, by length of time in continuous unrealized loss position Held To Maturity Securities Continuous Unrealized Loss Position [Table Text Block] Held to maturity securities continuous unrealized loss position. 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] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Recognition and Retention Plan Recognition and Retention Plan [Member] Recognition and Retention Plan [Member] 2014 Stock Incentive Plan 2014 Stock Incentive Plan [Member] [Member] 2014 Stock Incentive Plan [Member] [Member] 2012 Stock Plan 2012 Stock Plan [Member] 2012 Stock Plan [Member] 2015 Omnibus Equity And Incentive Plan 2015 Omnibus Equity And Incentive Plan [Member] 2015 Omnibus Equity And Incentive Plan [Member] Stock Compensation Grants associated with legacy Sterling Merger Stock Compensation Grants associated with legacy Sterling Merger [Member] Stock Compensation Grants associated with legacy Sterling Merger [Member] Shares available for grant (in shares) Share-Based Compensation Arrangement By Share-Based Payment Award, Shares Available For Grant [Roll Forward] Share-Based Compensation Arrangement By Share-Based Payment Award, Shares Available For Grant [Roll Forward] Beginning balance Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 2014 Stock Incentive Plan Share-Based Compensation Arrangement By Share-Based Payment Award, Shares Available For Grant, Approval Of Incentive Plan, Additions Share-Based Compensation Arrangement By Share-Based Payment Award, Shares Available For Grant, Approval Of Incentive Plan, Additions 2012 Stock Incentive Plan termination Share-Based Compensation Arrangement By Share-Based Payment Award, Shares Available For Grant, Termination Of Incentive Plan, Reduction Share-Based Compensation Arrangement By Share-Based Payment Award, Shares Available For Grant, Termination Of Incentive Plan, Reduction 2015 Omnibus Equity and Incentive Plan Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Granted 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 Stock awards vested 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 Forfeited Share-Based Compensation Arrangement By Share-Based Payment Award, Shares Available For Grant, Forfeitures in Period Share-Based Compensation Arrangement By Share-Based Payment Award, Forfeitures in Period Canceled/expired 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 Ending balance 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] Beginning balance Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Stock awards vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Ending balance Non-vested stock awards/stock units outstanding - 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] Beginning balance (USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted (USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value 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 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 Ending balance (USD per share) Stock options outstanding - Number of shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Beginning balance Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Canceled/expired Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period Ending balance Exercisable at December 31, 2015 Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Stock options outstanding - Weighted average exercise price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Beginning balance (USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Granted (USD per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Exercised (USD per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Forfeited (USD per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Canceled/expired (USD per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Ending balance (USD per share) Exercisable at December 31, 2015 (USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Number of shares granted for each share received Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Number of Shares Received for each Share Granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Number of Shares Received for each Share Granted Changes in projected benefit obligation: Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Beginning of year balance Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Projected Benefit Obligation Obligations assumed in acquisitions Defined Benefit Plan, Business Combinations and Acquisitions, Benefit Obligation Plan amendment Defined Benefit Plan, Plan Amendments Service cost Defined Benefit Plan, Service Cost Interest cost Defined Benefit Plan, Interest Cost Actuarial loss Defined Benefit Plan, Actuarial Gain (Loss) Curtailment (gain) Defined Benefit Plan, Curtailments Plan termination / Partial settlement Defined Benefit Plan, Settlements, Benefit Obligation Benefits and distributions paid Defined Benefit Plan, Benefits Paid End of year balance Changes in fair value of plan assets: Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Beginning of year balance Actual (loss) gain on plan assets Defined Benefit Plan, Actual Return on Plan Assets Employer contributions Defined Benefit Plan, Contributions by Employer Plan participants’ contributions Defined Benefit Plan, Contributions by Plan Participants Plan termination / Partial settlement Defined Benefit Plan, Settlements, Plan Assets Benefits and distributions paid End of year balance Reversion asset / Funded status at end of year Defined Benefit Plan, Funded Status of Plan FHLB Borrowings Federal Home Loan Bank Advances [Member] Repurchase Agreements Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Member] Schedule of debt Long-term Debt, by Category, Current and Noncurrent [Abstract] By period to maturity: Long-term Debt, Rolling Maturity [Abstract] Less than one year, Amount Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months 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. One to two years, Amount Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two 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. Two to three years, Amount Long-term Debt, Maturities, Repayments of Principal in Rolling Year Three 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. Three to four years, Amount Long-term Debt, Maturities, Repayments of Principal in Rolling Year Four Three to four years, Rate Long Term Debt Maturities Weighted Average Interest Rate In Rolling Year Four Long term debt maturities weighted average interest rate in rolling year four. Four to five years, Amount Long-term Debt, Maturities, Repayments of Principal in Rolling Year Five Four to five years, Rate Long Term Debt Maturities Weighted Average Interest Rate In Rolling Year Five Long term debt maturities weighted average interest rate in rolling year five. Greater than five years, Amount Long-term Debt, Maturities, Repayments of Principal in Rolling after Year Five 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. Total borrowings, Amount Total borrowings, Rate Long-term Debt, Weighted Average Interest Rate Schedule of Quarterly Financial Information Schedule of Quarterly Financial Information [Table Text Block] Accounting Changes and Error Corrections [Abstract] Recently Issued Accounting Standards Description of New Accounting Pronouncements Not yet Adopted [Text Block] Quarterly Results Of Operations (Unaudited) Quarterly Financial Information [Text Block] Required cash on hand or on deposit with the Federal Reserve Bank Restricted Cash and Cash Equivalents Minimum duration of performance required by loan restructures Minimum Duration of Performance Required by Loan Restructures Minimum Duration of Performance Required by Loan Restructures Components of loan portfolio, excluding loans held for sale Loans and Leases Receivable, Net Amount [Abstract] Commercial & industrial (“C&I”) Loans Receivable, Gross, Commercial and Industrial Payroll finance Payroll financing Payroll financing Warehouse lending Loans Receivable, Gross, Mortgage Warehouse Lending Factored receivables Factored Receivables Factored Receivables Equipment financing Equipment financing Equipment financing Total commercial Loans and Leases Receivable, Gross, Commercial Commercial real estate (“CRE”) Loans Receivable, Gross, Commercial, Real Estate Multi-family Multi family mortgage loans Multi family mortgage loans Acquisition, development & construction (“ADC”) Loans Receivable Commercial Acquisition Development And Construction Loans receivable commercial acquisition development and construction. Total commercial mortgage Loans Receivable, Gross, Commercial, Mortgage Total commercial and commercial mortgage Loans Receivable, Commercial Loans and Commercial Mortgage Loans Receivable, Commercial Loans and Commercial Mortgage Real estate-residential mortgage loans One To Four Family Residential Mortgage Loans One to four family residential mortgage loans. Consumer Loans and Leases Receivable, Gross, Consumer Gross loans Loans and Leases Receivable, Gross Allowance for loan losses Total loans, net Loans and Leases Receivable, Net Amount Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract] Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract] 2016 Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months 2017 Defined Benefit Plan, Expected Future Benefit Payments, Year Two 2018 Defined Benefit Plan, Expected Future Benefit Payments, Year Three 2019 Defined Benefit Plan, Expected Future Benefit Payments, Year Four 2020 Defined Benefit Plan, Expected Future Benefit Payments, Year Five Thereafter Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter Schedule of Future Minimum Rental Payments for Operating Leases Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Estimated fair value on a recurring basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Impaired loans measured at estimated fair value on nonrecurring basis Fair Value Measurements, Nonrecurring [Table Text Block] Quantitative information of Level 3 assets Fair Value Inputs, Assets, Quantitative Information [Table Text Block] Carrying amounts and estimated fair value of financial assets and liabilities Fair Value, by Balance Sheet Grouping [Table Text Block] Discount rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Discount rate used to value periodic cost Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Income Taxes Income Tax Disclosure [Text Block] Statement of Financial Position [Abstract] ASSETS: Cash and due from banks Securities: Marketable Securities [Abstract] Available for sale, at fair value Held to maturity, at amortized cost (fair value of $734,079, and $586,346 at December 31, 2015 and 2014, respectively) Total securities Marketable Securities Loans held for sale Loans Receivable Held-for-sale, Net, Not Part of Disposal Group Federal Home Loan Bank (“FHLB”) stock, at cost Federal Home Loan Bank Stock Accrued interest receivable Interest Receivable Premises and equipment, net Goodwill Core deposit and other intangible assets Intangible Assets, Net (Excluding Goodwill) Bank owned life insurance Bank Owned Life Insurance LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities and Equity [Abstract] LIABILITIES: Deposits FHLB borrowings Long-term Federal Home Loan Bank Advances Other borrowings (repurchase agreements) Federal Funds Purchased and Securities Sold under Agreements to Repurchase Senior notes Mortgage escrow funds Advance Payments by Borrowers for Taxes and Insurance Other liabilities Commitments and Contingent liabilities Commitments and Contingencies STOCKHOLDERS’ EQUITY: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock (par value $0.01 per share; 10,000,000 shares authorized; none issued or outstanding) Preferred Stock, Value, Issued Common stock (par value $0.01 per share; 190,000,000 shares authorized; 136,673,149 and 91,246,024 shares issued at December 31, 2015 and 2014, respectively; 130,006,926 and 83,927,572, outstanding at December 31, 2015 and 2014, respectively) Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Treasury stock, at cost (6,666,223 shares and 7,318,452 shares at December 31, 2015 and 2014, respectively) Treasury Stock, Value Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive (loss), net of tax (benefit) of ($8,961) at December 31, 2015 and ($7,576) at December 31, 2014 Total stockholders’ equity Sterling Bancorp (Legacy) Sterling Bancorp (Legacy) [Member] Sterling Bancorp (Legacy) [Member] HVB Merger Legacy Sterling/ National Bank employees' Retirement Plan legacy Sterling/ National Bank employees' Retirement Plan [Member] legacy Sterling/ National Bank employees' Retirement Plan [Member] Employee Savings Plan Employee Savings Plan [Member] Employee Savings Plan [Member] Employee Stock Ownership Plan Employee Stock Ownership Plan [Member] Employee Stock Ownership Plan [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Other Other Assets [Member] Other Liabilities Other Liabilities [Member] Employee Stock Ownership Plan (ESOP) Name [Axis] Employee Stock Ownership Plan (ESOP) Name [Axis] Employee Stock Ownership Plan (ESOP), Plan [Domain] Employee Stock Ownership Plan (ESOP), Plan [Domain] Employee Stock Ownership Plan (ESOP) loan repayment Employee Stock Ownership Plan (ESOP) loan repayment [Member] Employee Stock Ownership Plan (ESOP) loan repayment [Member] Benefit plan, eligibility age Defined Benefit Plan, Minimum Employee Eligibility Age Defined Benefit Plan, Minimum Employee Eligibility Age Increase of accrued benefit Increase of accrued benefit Increase of accrued benefit Lump sum distributions as elected by Plan participants Change in fair value of Plan assets Defined Benefit Plan, Fair Value of Plan Assets, Period Increase (Decrease) Remaining balance of accumulated other comprehensive loss through earnings recognized Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Settlements, Before Tax Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Settlements, Before Tax Difference between effective tax rate and marginal tax rate Effective Income Tax Rate Reconciliation, Settlements of Pension and Other Postretirement Defined Benefit Plans Effective Income Tax Rate Reconciliation, Settlements of Pension and Other Postretirement Defined Benefit Plans Remaining reversion asset Defined Benefit Plan, Reversion Asset, Due To Settlement Defined Benefit Plan, Reversion Asset, Due To Settlement Remaining reversion asset, recognition period Defined Benefit Plan, Reversion Asset, Recognition Period Defined Benefit Plan, Reversion Asset, Recognition Period Amounts recognized in accumulated other comprehensive (loss) due to Plan termination Accumulated Other Comprehensive Income (Loss), Pension Termination, Net Of Tax Accumulated Other Comprehensive Income (Loss), Pension Termination, Net Of Tax Net periodic pension cost, Long-term rate of return on plan assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets Plan benefit asset allocations Defined Benefit Plan, Actual Plan Asset Allocations Bank owned life insurance Life Insurance, Corporate or Bank Owned, Amount Assumed SERP liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Postretirement Defined Benefit Plan, Liabilities Assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Postretirement Defined Benefit Plan, Liabilities Assumed Maximum contribution by employee, percent Defined Contribution Plan, Maximum Contribution by Employee, Percent Defined Contribution Plan, Maximum Contribution by Employee, Percent Maximum contribution by employer, percent of employee contribution Defined Contribution Plan, Maximum Contribution by Employer, Percent of Employee Contribution Defined Contribution Plan, Maximum Contribution by Employer, Percent of Employee Contribution Maximum annual contribution per employee, percent Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent Savings plan expense Defined Contribution Plan, Cost Recognized Amount borrowed by ESOP Employee Stock Ownership Plan (ESOP), Debt Structure, Direct Loan, Amount Number of shares purchased for ESOP with borrowings Employee Stock Ownership Plan (ESOP), Shares Contributed to ESOP Term of loan Employee Stock Ownership Plan (ESOP), Debt Structure, Direct Loan, Loan Term Employee Stock Ownership Plan (ESOP), Debt Structure, Direct Loan, Loan Term Employee stock ownership plan percent automatically vested upon termination Employee stock ownership plan percent automatically vested upon termination Employee stock ownership plan percent automatically vested upon termination Cumulative shares in ESOP Employee Stock Ownership Plan (ESOP), Shares in ESOP Number of ESOP shares allocated Employee Stock Ownership Plan (ESOP), Number of Allocated Shares ESOP expense (net of forfeitures) Employee Stock Ownership Plan (ESOP), Compensation Expense Other securities: Securities Investment [Member] Investment Type Categorization [Domain] Agency-backed Agency Securities [Member] CMO/Other MBS Collateralized Mortgage Obligations [Member] Federal agencies US Government Agencies Debt Securities [Member] Corporate Corporate Debt Securities [Member] State and municipal US States and Political Subdivisions Debt Securities [Member] Fair value, Less than 12 months Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Unrealized losses, Less than 12 months Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Fair value, 12 months or longer Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Unrealized losses, 12 months or longer Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Fair value, Total Ava