Fair Value Disclosures [Abstract]
Fair Value Measurements, Recurring and Nonrecurring [Table]
Fair Value Measurements, Recurring and Nonrecurring [Table]
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]
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV [Domain]
Fair Value Hierarchy and NAV [Domain]
Level 1 inputs
Fair Value, Inputs, Level 1 [Member]
Level 2 inputs
Fair Value, Inputs, Level 2 [Member]
Level 3 inputs
Fair Value, Inputs, Level 3 [Member]
Financial Instrument [Axis]
Financial Instrument [Axis]
Types of Financial Instruments [Domain]
Financial Instruments [Domain]
Commercial & industrial
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.
CRE
Commercial Real Estate [Member]
Multi-family
Real Estate Commercial Mortgage CBL [Member]
Real estate commercial mortgage CBL.
Residential mortgage
Residential Mortgage [Member]
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]
Portfolio loans, impaired, net
Loans Receivable, Fair Value Disclosure
Investments, Debt and Equity Securities [Abstract]
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.
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 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
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
Subsequent Events [Abstract]
Subsequent Events
Subsequent Events [Text Block]
Postemployment Benefits [Abstract]
Schedule of Defined Benefit Plans Disclosures [Table]
Schedule of Defined Benefit Plans Disclosures [Table]
Defined Benefit Plan, Plan Assets, Category [Axis]
Defined Benefit Plan, Plan Assets, Category [Axis]
Defined Benefit Plan, Plan Assets, Category [Domain]
Defined Benefit Plan, Plan Assets, Category [Domain]
PRIAC Pooled Separate Accounts
PRIAC Pooled Separate Accounts [Member]
PRIAC Pooled Separate Accounts [Member]
Sterling Bancorp common stock
Sterling Bancorp Common Stock [Member]
Sterling Bancorp Common Stock [Member]
PRIAC Guaranteed Deposit Account
PRIAC Guaranteed Deposit Account [Member]
PRIAC Guaranteed Deposit Account [Member]
Cash and cash equivalents
Defined Benefit Plan, Cash and Cash Equivalents [Member]
Fixed income
Fixed Income Securities [Member]
Large-cap equity
Defined Benefit Plan, Equity Securities, Large Cap [Member]
International equity
Defined Benefit Plan, Equity Securities, Non-US [Member]
Small-cap equity
Defined Benefit Plan, Equity Securities, Small Cap [Member]
Mid-cap equity
Defined Benefit Plan, Equity Securities, Mid Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Defined Benefit Plan, Plan Assets, Amount
Plan asset allocations
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage
Stockholders' Equity Note [Abstract]
Stockholders' Equity
Stockholders' Equity Note Disclosure [Text Block]
Summary of securities available for sale
Debt Securities, Available-for-sale [Table Text Block]
Summary of securities held-to-maturity
Debt Securities, Held-to-maturity [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
Schedule of Realized Gain (Loss) [Table Text Block]
Securities available for sale with unrealized losses, by length of time in continuous unrealized loss position
Schedule of Unrealized Loss on Investments [Table Text Block]
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]
Derivative Instruments and Hedges, Assets [Abstract]
Schedule of Credit Derivatives [Table]
Schedule of Credit Derivatives [Table]
Derivative Instrument [Axis]
Derivative Instrument [Axis]
Derivative Contract [Domain]
Derivative Contract [Domain]
Third-party interest rate swap
Third Party Interest Rate Swap [Member]
Third party interest rate swap.
Customer interest rate swap
Customer Interest Rate Swap [Member]
Customer interest rate swap.
Balance Sheet Location [Axis]
Balance Sheet Location [Axis]
Balance Sheet Location [Domain]
Balance Sheet Location [Domain]
Other Assets
Other Assets [Member]
Other Liabilities
Other Liabilities [Member]
Variable Rate [Axis]
Variable Rate [Axis]
Variable Rate [Domain]
Variable Rate [Domain]
One Month LIBOR
One Month Libor [Member]
One Month Libor [Member]
Credit Derivatives [Line Items]
Credit Derivatives [Line Items]
Summary of derivatives
Summary of Credit Derivatives [Abstract]
Derivative assets, notional amount
Derivative Asset, Notional Amount
Derivative liabilities, notional amount
Derivative Liability, Notional Amount
Average maturity (in years)
Derivative, Average Remaining Maturity
Weighted average fixed rate
Derivative, Average Fixed Interest Rate
Basis spread
Derivative, Basis Spread on Variable Rate
Derivative assets, fair value
Derivative Asset
Derivative liabilities, fair value
Derivative Liability
Receivables [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table]
Real Estate, Type of Property [Axis]
Real Estate, Type of Property [Axis]
Real Estate [Domain]
Real Estate [Domain]
Multi-family
Multifamily [Member]
Financing Receivable Portfolio Segment [Axis]
Financing Receivable Portfolio Segment [Axis]
Financing Receivable Portfolio Segment [Domain]
Financing Receivable Portfolio Segment [Domain]
Commercial
Commercial Portfolio Segment [Member]
Residential mortgage
Residential Portfolio Segment [Member]
Consumer
Consumer Portfolio Segment [Member]
Industry Sector [Axis]
Industry Sector [Axis]
Industry Sector [Domain]
Industry Sector [Domain]
Commercial & Industrial (C&I)
Commercial and Industrial Sector [Member]
Commercial mortgage
Real Estate Sector [Member]
Credit Loss Status [Axis]
Credit Loss Status [Axis]
Credit Loss Status [Domain]
Credit Loss Status [Domain]
Receivables without deteriorated credit quality
Receivables Without Deteriorated Credit Quality [Member]
Receivables Without Deteriorated Credit Quality [Member]
Receivables acquired with deteriorated credit quality
Financial Asset Acquired with Credit Deterioration [Member]
Class of Financing Receivable, Type [Axis]
Class of Financing Receivable, Type [Axis]
Class of Financing Receivable, Type [Domain]
Class of Financing Receivable, Type [Domain]
Traditional C&I
Asset-based lending
Asset-Based Lending [Member]
Asset-Based Lending [Member]
Payroll finance
Payroll Finance [Member]
Payroll Finance [Member]
Equipment financing
Equipment Financing Receivables [Member]
A loan related to equipment finance receivable.
Real estate loan
Real Estate Loan [Member]
ADC
Acquisition, Development And Construction [Member]
Acquisition Development And Construction [Member]
Consumer
Consumer Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non accrual loans
Financing Receivable, Recorded Investment, Nonaccrual Status
Non-accrual loans, unpaid principal balance
Financing Receivable, Recorded Investment, Nonaccrual Status, Unpaid Principal Balance
Financing Receivable, Recorded Investment, Nonaccrual Status, Unpaid Principal Balance
Investments in Affordable Housing Projects [Abstract]
Gross investment in LIHTC
Amortization Method Qualified Affordable Housing Project Investments, Gross
Amortization Method Qualified Affordable Housing Project Investments, Gross
Accumulated amortization
Amortization Method Qualified Affordable Housing Project Investments, Accumulated Amortization
Amortization Method Qualified Affordable Housing Project Investments, Accumulated Amortization
Net investment in LIHTC
Amortization Method Qualified Affordable Housing Project Investments
Unfunded commitments for LIHTC investments
Qualified Affordable Housing Project Investments, Commitment
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Amortized costs, one year or less
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost
Amortized costs, one to five years
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost
Amortized costs, five to ten years
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost
Amortized costs, greater than ten years
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost
Total other securities
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost
Residential MBS
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost
Amortized cost
Debt Securities, Available-for-sale, Amortized Cost
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Fair value, one year or less
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value
Fair value, one to five years
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value
Fair value, five to ten years
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value
Fair value, greater than ten years
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value
Fair value, total other securities
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value
Fair value, Residential MBS
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value
Fair value, total securities
Debt Securities, Available-for-sale
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]
Amortized cost, one year or less
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost
Amortized cost, one to five years
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost
Amortized cost, five to ten years
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost
Amortized cost, greater than ten years
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Amortized Cost
Amortized cost, total other securities
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost
Amortized cost, Residential MBS
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Amortized Cost
Amortized cost
Debt Securities, Held-to-maturity
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Fair value, one year or less
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value
Fair value, one to five years
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value
Fair value, five to ten years
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value
Fair value, greater than ten years
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value
Fair value, total other securities
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value
Fair value, Residential MBS
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value
Fair value, total securities
Debt Securities, Held-to-maturity, Fair Value
Schedule of Fair Value, Off-balance Sheet Risks [Table]
Schedule of Fair Value, Off-balance Sheet Risks [Table]
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
Income Tax Disclosure [Abstract]
Income Taxes
Income Tax Disclosure [Text Block]
Statement of Stockholders' Equity [Abstract]
Statement [Table]
Statement [Table]
Equity Components [Axis]
Equity Components [Axis]
Equity Component [Domain]
Equity Component [Domain]
Preferred stock
Preferred Stock [Member]
Statement [Line Items]
Statement [Line Items]
Common stock, cash dividends paid (USD per share)
Common Stock, Dividends, Per Share, Cash Paid
Stock issued in merger transaction (in shares)
Stock Issued During Period, Shares, Acquisitions
Preferred stock, cash dividends paid (USD per share)
Preferred Stock, Dividends, Per Share, Cash Paid
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]
Astoria Financial Corporation
Astoria Financial Corporation [Member]
Astoria Financial Corporation [Member]
Business Acquisition [Line Items]
Business Acquisition [Line Items]
Net interest income
Business Acquisition, Pro Forma Interest Income (Expense), Net
Business Acquisition, Pro Forma Interest Income (Expense), Net
Non-interest income
Business Acquisition, Pro Forma Noninterest Income
Business Acquisition, Pro Forma Noninterest Income
Non-interest expense
Business Acquisition, Pro Forma Noninterest Expense
Business Acquisition, Pro Forma Noninterest Expense
Net income available to common stockholders
Business Acquisition, Pro Forma Net Income (Loss)
Pro forma earnings per common share from continuing operations:
Earnings Per Share, Pro Forma [Abstract]
Basic (in dollars per share)
Business Acquisition, Pro Forma Earnings Per Share, Basic
Diluted (in dollars per share)
Business Acquisition, Pro Forma Earnings Per Share, Diluted
Statement of Financial Position [Abstract]
ASSETS:
Assets [Abstract]
Cash and due from banks
Cash and Due from Banks
Securities:
Marketable Securities [Abstract]
Available for sale, at fair value
Held to maturity, at amortized cost (fair value of $2,740,522 and $2,863,909 at December 31, 2018 and December 31, 2017, respectively)
Total securities
Marketable Securities
Loans Receivable, Net [Abstract]
Loans Receivable, Net [Abstract]
Loans held for sale
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group
Portfolio loans
Loans and Leases Receivable, Gross
Allowance for loan losses
Loans and Leases Receivable, Allowance
Portfolio loans, net
Loans and Leases Receivable, Net Amount
Federal Home Loan Bank (“FHLB”) and Federal Reserve Bank stock, at cost
Federal Home Loan Bank Stock
Accrued interest receivable
Interest Receivable
Premises and equipment, net
Property, Plant and Equipment, Net
Goodwill
Goodwill
Core deposit and other intangible assets
Intangible Assets, Net (Excluding Goodwill)
Bank owned life insurance
Bank Owned Life Insurance
Other real estate owned
Other Real Estate, Foreclosed Assets, and Repossessed Assets
Other assets
Other Assets
Total assets
Assets
LIABILITIES AND STOCKHOLDERS’ EQUITY
Liabilities and Equity [Abstract]
LIABILITIES:
Liabilities [Abstract]
Deposits
Deposits
FHLB borrowings
Long-term Federal Home Loan Bank Advances
Other borrowings (repurchase agreements)
Securities Sold under Agreements to Repurchase
Senior notes
Senior Notes
Subordinated notes
Subordinated Debt
Mortgage escrow funds
Advance Payments by Borrowers for Taxes and Insurance
Other liabilities
Other Liabilities
Total liabilities
Liabilities
Commitments and Contingent liabilities (See Note 18.)
Commitments and Contingencies
STOCKHOLDERS’ EQUITY:
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock (par value $0.01 per share; 10,000,000 shares authorized; 135,000 shares issued and outstanding at December 31, 2018 and December 31, 2017)
Preferred Stock, Value, Issued
Common stock (par value $0.01 per share; 310,000,000 shares authorized at December 31, 2018 and December 31, 2017; 229,872,925 shares issued at December 31, 2018 and December 31, 2017; 216,227,852 and 224,782,694 shares outstanding at December 31, 2018 and December 31, 2017, respectively)
Common Stock, Value, Issued
Additional paid-in capital
Additional Paid in Capital
Treasury stock, at cost (13,645,073 shares at December 31, 2018 and 5,090,231 shares at December 31, 2017)
Treasury Stock, Value
Retained earnings
Retained Earnings (Accumulated Deficit)
Accumulated other comprehensive loss, net of tax benefit of $(25,429) at December 31, 2018 and $(17,083) at December 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax
Total stockholders’ equity
Stockholders' Equity Attributable to Parent
Total liabilities and stockholders’ equity
Liabilities and Equity
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]
Customer lists
Customer Lists [Member]
NSBC
NewStar Business Credit LLC [Member]
NewStar Business Credit LLC [Member]
Percentage of outstanding common stock acquired
Business Acquisition, Percentage of Voting Interests Acquired
Loans receivable acquired
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Assets
Premium paid for loans receivable acquired as a percent of gross loans acquired
Business Combination, Premium Paid For Loans Receivable, Percent Of Gross Loans
Business Combination, Premium Paid For Loans Receivable, Percent Of Gross Loans
Premium paid for loans receivable acquired
Business Combination, Premium Paid For Loans Receivable, Amount
Business Combination, Premium Paid For Loans Receivable, Amount
Total liabilities assumed
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities
Restructuring charges
Restructuring Charges
Estimated useful life
Finite-Lived Intangible Asset, Useful Life
Goodwill
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss) [Table]
Accumulated Other Comprehensive Income (Loss) [Table]
Net unrealized holding gain (loss) on AFS securities
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Net unrealized holding gain (loss) 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]
Net unrealized holding gain (loss) on retirement plans
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated other comprehensive (loss) income
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance
Reclassification of the stranded income tax effects from the enactment of the Tax Cuts and Jobs Act of 2017 from accumulated other comprehensive loss
Tax Cuts And Jobs Act, Reclassification From AOCI To Retained Earnings, Tax Effect
Tax Cuts And Jobs Act, Reclassification From AOCI To Retained Earnings, Tax Effect
Other comprehensive (loss) before reclassification
OCI, before Reclassifications, Net of Tax, Attributable to Parent
Amounts reclassified from AOCI
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent
Total other comprehensive (loss) income
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Ending balance
Summary of changes in the projected benefit obligation and fair value of plan assets
Schedule of Net Funded Status [Table Text Block]
Schedule of pre-tax components of accumulated other comprehensive loss
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
Schedule of assumptions used for plan
Schedule of Assumptions Used [Table Text Block]
Components of the net periodic pension expense (benefit)
Schedule of Net Benefit Costs [Table Text Block]
Schedule of Health Care Cost Trend Rates
Schedule of Health Care Cost Trend Rates [Table Text Block]
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]
Schedule of expected benefit payments
Schedule of Expected Benefit Payments [Table Text Block]
Schedule of Allocation of Plan Assets
Schedule of Allocation of Plan Assets [Table Text Block]
Schedule of Level 3 Plan Assets
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]
Debt Securities, Held-to-maturity [Table]
Debt Securities, Held-to-maturity [Table]
Financial Instruments [Domain]
Agency-backed
Agency Securities [Member]
CMO/Other MBS
Collateralized Mortgage Obligations [Member]
Total residential MBS
Residential Mortgage Backed Securities [Member]
Federal agencies
US Government Agencies Debt Securities [Member]
Corporate bonds
Corporate Debt Securities [Member]
State and municipal
US States and Political Subdivisions Debt Securities [Member]
Other
Other Investment Securities [Member]
Other investment securities.
Total other securities
Debt Securities, Excluding Residential Mortgage Backed Securities [Member]
Debt Securities, Excluding Residential Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Schedule of Held-to-maturity Securities [Line Items]
Fair value, less than 12 months
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value
Unrealized losses, less than 12 months
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss
Fair value, 12 months or longer
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value
Unrealized losses, 12 months or longer
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss
Fair value, total
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value
Unrealized losses, total
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Property, Plant and Equipment [Table]
Property, Plant and Equipment [Table]
Range [Axis]
Range [Axis]
Range [Domain]
Range [Domain]
Minimum
Minimum [Member]
Maximum
Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment [Line Items]
Premises and equipment, useful life
Property, Plant and Equipment, Useful Life
Securities
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]
Schedule of Financing Receivables Past Due [Table]
Schedule of Financing Receivables Past Due [Table]
Receivable Type [Axis]
Receivable Type [Axis]
Receivable [Domain]
Receivable [Domain]
Acquired loans
Acquired Loan [Member]
Acquired Loan [Member]
Originated loans
Originated Loan [Member]
Originated Loan [Member]
Financing Receivables, Period Past Due [Axis]
Financing Receivables, Period Past Due [Axis]
Financing Receivables, Period Past Due [Domain]
Financing Receivables, Period Past Due [Domain]
30-59 days past due
Financing Receivables, 30 to 59 Days Past Due [Member]
60-89 days past due
Financing Receivables, 60 to 89 Days Past Due [Member]
90 days past due
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Warehouse lending
Warehouse Lending [Member]
Warehouse lending [Member]
Factored receivables
Factored Receivables [Member]
A loan related to factored receivables.
Public sector finance
Public Sector Finance [Member]
Public Sector Finance [Member]
Internal Credit Assessment [Axis]
Internal Credit Assessment [Axis]
Internal Credit Assessment [Domain]
Internal Credit Assessment [Domain]
Nonperforming loans
Nonperforming Financial Instruments [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-Performing loans:
Non Performing Loans [Abstract]
Non performing loans.
Current loans
Financing Receivable, Recorded Investment, Current
Past due loans
Financing Receivable, Recorded Investment, Past Due
Total portfolio loans
TDRs, Current
Trouble Debt restructuring current loans
Trouble Debt restructuring current loans
TDRs, Non-accrual
Non Accrual Loans Under Troubled debt restructurings
Non accrual loans.
Troubled debt restructurings
Financing Receivable, Modifications, Recorded Investment
Non-performing loans:
Non Performing Assets [Abstract]
Non performing assets:
Loans 90 days past due and still accruing
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing
Total non-performing loans
Non Performing Loans Total
Total non performing loans.
Other Income and Expenses [Abstract]
Noon-Interest Income and Other Non-Interest Expense
Other non-interest expense [Text Block]
Other non-interest expense [Text Block]
Loans transfered from held for investment to held for sale
Transfer of Portfolio Loans and Leases to Held-for-sale
Loan purchase accounting adjustments transferred from held for investment to held for sale
Transfer Of Portfolio Loans Purchase Accounting Adjustments To Held-for-sale
Transfer Of Portfolio Loans Purchase Accounting Adjustments To Held-for-sale
Acquisitions
Business Combination Disclosure [Text Block]
Retirement Plan Type [Axis]
Retirement Plan Type [Axis]
Retirement Plan Type [Domain]
Retirement Plan Type [Domain]
Pension benefits
Pension Plan [Member]
Other post retirement benefits
Other Postretirement Benefits Plan [Member]
Net actuarial gain (loss)
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax
Deferred tax (expense) benefit
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, Tax
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, Tax
Amount included in accumulated other comprehensive loss, net of tax
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information
Quarterly Financial Information [Table Text Block]
Cash pledged as collateral for swaps
Derivative, Collateral, Right to Reclaim Cash
Changes in projected benefit obligation:
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning of year balance
Defined Benefit Plan, Benefit Obligation
Benefit obligation assumed in Astoria Merger
Defined Benefit Plan, Benefit Obligation, Business Combination
Service cost
Defined Benefit Plan, Service Cost
Interest cost
Defined Benefit Plan, Interest Cost
Actuarial loss
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)
Benefits paid
Defined Benefit Plan, Benefit Obligation, Benefits Paid
Other
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Other Change
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
Fair value of pension plan assets at October 2, 2017
Defined Benefit Plan, Plan Assets, Business Combination
Actual gain on plan assets
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)
Employer contributions
Defined Benefit Plan, Plan Assets, Contributions by Employer
Benefits paid
Defined Benefit Plan, Plan Assets, Benefits Paid
End of year balance
Reversion asset / Funded status at end of year
Defined Benefit Plan, Funded (Unfunded) Status of Plan
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill [Table]
Schedule of Goodwill [Table]
Advantage Funding Management Co., Inc.
Advantage Funding Management Co., Inc. [Member]
Advantage Funding Management Co., Inc. [Member]
Goodwill [Line Items]
Goodwill [Line Items]
Goodwill [Roll Forward]
Goodwill [Roll Forward]
Beginning of period balance
Acquired goodwill
Goodwill, Acquired During Period
Adjustment to provisional goodwill from Astoria Merger
Goodwill, Purchase Accounting Adjustments
End of period balance
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table]
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table]
Consolidated Entities [Axis]
Consolidated Entities [Axis]
Consolidated Entities [Domain]
Consolidated Entities [Domain]
Sterling National Bank
Subsidiaries [Member]
Sterling Bancorp
Parent Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Regulatory Capital Requirements [Abstract]
Regulatory Capital Requirements [Abstract]
Common equity tier 1 to RWA:
Tier One Common Equity [Abstract]
Tier One Common Equity [Abstract]
Tier 1 common equity, actual, capital amount
Common Equity Tier One Capital
Tier 1 common equity, actual, ratio
Common Equity Tier One Capital Ratio
Tier 1 common equity required for minimum capital adequacy, phase-in schedule, capital amount
Tier One Common Capital Required For Capital Adequacy, Phase-In Schedule
Tier One Common Capital Required for Capital Adequacy, Phase-In Schedule
Tier 1 common equity required for minimum capital adequacy ratio, phase-in schedule, ratio
Tier One Common Capital Required For Capital Adequacy To Risk Weighted Assets, Phase-In Schedule
Tier One Common Capital Required For Capital Adequacy To Risk Weighted Assets, Phase-In Schedule
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
Tier 1 common equity required for minimum capital adequacy ratio, 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, capital
Common Equity Tier One Capital Required to be Well-Capitalized
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
Tier 1 capital to RWA:
Tier One Risk Based Capital [Abstract]
Tier 1 risk-based capital, actual, capital amount
Tier One Risk Based Capital
Tier 1 risk-based capital, actual, ratio
Tier One Risk Based Capital to Risk Weighted Assets
Tier 1 risk-based capital required for minimum capital adequacy, phase-in schedule, capital amount
Tier One Risk Based Capital Required For Capital Adequacy, Phase-In Schedule
Tier One Risk Based Capital Required For Capital Adequacy, Phase-In Schedule
Tier 1 risk-based capital required for minimum capital adequacy ratio, phase-in schedule, ratio
Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets, Phase-In Schedule
Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets, Phase-In Schedule
Tier 1 risk-based capital required for minimum capital adequacy, fully phased-in, capital amount
Tier One Risk Based Capital Required For Capital Adequacy, Fully Phased-In
Tier One Risk Based Capital Required For Capital Adequacy, Fully Phased-In
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
Tier 1 risk-based capital required to be well capitalized, capital amount
Tier One Risk Based Capital Required to be Well Capitalized
Tier 1 risk-based capital required to be well capitalized, ratio
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets
Total capital to RWA:
Capital [Abstract]
Total risk-based capital, actual, capital amount
Capital
Total risk-based capital, actual, ratio
Capital to Risk Weighted Assets
Total risk-based capital required for minimum capital adequacy, phase-in schedule, capital amount
Capital Required For Capital Adequacy, Phase-In Schedule
Capital Required For Capital Adequacy, Phase-In Schedule
Total risk-based capital required for minimum capital adequacy ratio, phase-in schedule, ratio
Capital Required For Capital Adequacy To Risk Weighted Assets, Phase-In Schedule
Capital Required For Capital Adequacy To Risk Weighted Assets, Phase-In Schedule
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
Total risk-based capital required for minimum capital adequacy ratio, 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
Total risk-based capital required to be well capitalized, capital amount
Capital Required to be Well Capitalized
Total risk-based capital required to be well capitalized, ratio
Capital Required to be Well Capitalized to Risk Weighted Assets
Tier 1 leverage ratio:
Tier One Leverage Capital [Abstract]
Tier 1 leverage ratio, actual, capital amount
Tier One Leverage Capital
Tier 1 (core) capital, actual, ratio
Tier One Leverage Capital to Average Assets
Tier 1 (core) capital required for minimum capital adequacy, phase-in schedule, capital amount
Tier One Leverage Capital Required For Capital Adequacy, Phase-In Schedule
Tier One Leverage Capital Required For Capital Adequacy, Phase-In Schedule
Tier 1 (core) capital required for minimum capital adequacy ratio, phase-in schedule, ratio
Tier One Leverage Capital Required For Capital Adequacy To Average Assets, Phase-In Schedule
Tier One Leverage Capital Required For Capital Adequacy To Average Assets, Phase-In Schedule
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
Tier 1 (core) capital required for minimum capital adequacy ratio, 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
Tier 1 (core) capital required to be well capitalized, capital amount
Tier One Leverage Capital Required to be Well Capitalized
Tier 1 (core) capital required to be well capitalized, ratio
Tier One Leverage Capital Required to be Well Capitalized to Average Assets
Financial Instruments Owned and Pledged as Collateral [Table]
Financial Instruments Owned and Pledged as Collateral [Table]
Collateral [Axis]
Collateral [Axis]
Collateral [Domain]
Collateral [Domain]
Collateral Pledged
Collateral Pledged [Member]
Federal Home Loan Bank Borrowings
Federal Home Loan Bank Borrowings [Member]
Municipal Deposits
Municipal Deposits [Member]
Municipal deposits.
Financial Instruments Owned and Pledged as Collateral [Line Items]
Financial Instruments Owned and Pledged as Collateral [Line Items]
Available-for-sale securities pledged as collateral
Debt Securities, Available-for-sale, Restricted
Held-to-maturity securities pledged as collateral
Debt Securities, Held-to-maturity, Restricted
Total securities pledged
Restricted Investments
Summary of derivatives
Schedule of Derivative Instruments [Table Text Block]
Available for sale
Debt Securities, Available-for-sale [Abstract]
Proceeds from sales of securities available for sale
Proceeds from Sale of Debt Securities, Available-for-sale
Gross realized gains
Debt Securities, Available-for-sale, Realized Gain
Gross realized losses
Debt Securities, Available-for-sale, Realized Loss
Income tax (benefit) expense on realized net (losses) gains
Tax Expense (Benefit) Of Securities Gains
Tax expense (benefit) of securities gains
Held to maturity
Debt Securities, Held-to-maturity [Abstract]
Proceeds from sales of securities held to maturity
Proceeds from Sale of Held-to-maturity Securities
Gross realized loss
Debt Securities, Held-to-maturity, Sold, Realized Gain (Loss)
Income tax (benefit) on realized loss
Tax expense held to maturity security gains
Tax expense held to maturity security gains
Commitments and Contingencies Disclosure [Abstract]
Schedule of future minimum lease payments due
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table]
Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table]
Core deposits
Core Deposits [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-Lived Intangible Assets [Line Items]
Number of reporting units
Number of Reporting Units
Acquired intangible assets, weighted average useful life
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life
Deposits [Abstract]
Deposits
Deposit Liabilities Disclosures [Text Block]
Debt Instruments [Abstract]
Schedule of Long-term Debt Instruments [Table]
Schedule of Long-term Debt Instruments [Table]
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]
Subordinated Notes
Subordinated Debt [Member]
Line of Credit
Line of Credit [Member]
Debt Instrument [Axis]
Debt Instrument [Axis]
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
Senior Note, 5.50%
Senior Note, 5.50% [Member]
Senior Note, 5.50% [Member]
Senior Notes, 3.50%
Senior Notes, 3.50% [Member]
Senior Notes, 3.50% [Member]
Scenario [Axis]
Scenario [Axis]
Scenario, Unspecified [Domain]
Scenario, Unspecified [Domain]
Fair value adjustments
Scenario, Adjustment [Member]
Three-month LIBOR
Three-Month London Interbank Offered Rate [Member]
Three-Month London Interbank Offered Rate [Member]
London Interbank Offered Rate (LIBOR)
London Interbank Offered Rate (LIBOR) [Member]
Credit Facility [Axis]
Credit Facility [Axis]
Credit Facility [Domain]
Credit Facility [Domain]
Revolving Credit Facility
Revolving Credit Facility [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.
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
Debt assumed
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt
Interest rate
Debt Instrument, Interest Rate, Stated Percentage
Percentage of acquisition date fair value recorded
Fair Value, Debt Assumed, Percentage Recorded For Estimated Fair Value
Fair Value, Debt Assumed, Percentage Recorded For Estimated Fair Value
Debt, fair value adjustment
Debt Instrument, Fair Value Disclosure
Effective yield, rate
Long-term Debt, Weighted Average Interest Rate, at Point in Time
Amount of debt redeemed
Extinguishment of Debt, Amount
Gain on extinguishment of debt
Gain (Loss) on Extinguishment of Debt
Principal amount
Debt Instrument, Face Amount
Debt issuance costs
Debt Issuance Costs, Gross
Issue premium
Debt Instrument, Issue Premium, Percentage
Debt Instrument, Issue Premium, Percentage
Unamortized discount
Debt Instrument, Unamortized Discount
Effective yield
Debt Instrument, Interest Rate, Effective Percentage
Basis spread rate
Debt Instrument, Basis Spread on Variable Rate
Revolving line of credit amount
Line of Credit Facility, Maximum Borrowing Capacity
Revolving line of credit balance
Long-term Line of Credit
Property, Plant and Equipment [Abstract]
Premises and Equipment, Net
Property, Plant and Equipment Disclosure [Text Block]
Portfolio Loans
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
Schedule of Stock by Class [Table]
Schedule of Stock by Class [Table]
Class of Stock [Axis]
Class of Stock [Axis]
Class of Stock [Domain]
Class of Stock [Domain]
Series A Preferred Stock
Series A Preferred Stock [Member]
Series C Preferred Stock
Series C Preferred Stock [Member]
Class of Stock [Line Items]
Class of Stock [Line Items]
Allowance for subordinated notes
Tier Two Risk Based Capital
Aggregate dividend capacity without prior regulatory approval
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval
Preferred stock, shares issued (in shares)
Preferred Stock, Shares Issued
Preferred stock (in shares)
Preferred stock dividend rate
Preferred Stock, Dividend Rate, Percentage
Preferred stock, par value (USD per share)
Preferred Stock, Par or Stated Value Per Share
Preferred stock liquidation preference (USD per share)
Preferred Stock, Liquidation Preference Per Share
Depositary shares issued (in shares)
Depositary Shares Issued
Depositary Shares Issued
Shares available for repurchase program (shares)
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased
Shares authorized to be repurchased (in shares)
Stock Repurchase Program, Number of Shares Authorized to be Repurchased
Purchase of treasury stock (in shares)
Treasury Stock, Shares, Acquired
Purchase of treasury stock, wieghted average price (USD per share)
Treasury Stock Acquired, Average Cost Per Share
Payments for repurchase of common stock
Payments for Repurchase of Common Stock
Shares repurchased under repurchase program (shares)
Stock Repurchased During Period, Shares
Liquidation account
Liquidation Account
Liquidation Account
Counterparty Name [Axis]
Counterparty Name [Axis]
Counterparty Name [Domain]
Counterparty Name [Domain]
GE Capital
GE Capital [Member]
GE Capital [Member]
Portfolio loan acquired, unpaid principal balance
Loans And Leases Receivable, Unpaid Principal Balance
Loans And Leases Receivable, Unpaid Principal Balance
Portfolio loans purchased
Payments to Acquire Loans Receivable
Discount rate on acquired portfolio loan
Loans and Leases Receivable, Purchase Discount Rate
Loans And Leases Receivable, Purchase Discount Rate
Discount amount on acquired loan receivable
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums
Schedule of Financing Receivable, Allowance for Credit Losses [Table]
Schedule of Financing Receivable, Allowance for Credit Losses [Table]
Consumer loans, including home equity
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses [Line Items]
Maximum loan balance for credit risk to be evaluated on a homogeneous basis
Minimum Loan Balance for Credit Risk to be Evaluated on a Homogeneous Basis
Minimum Loan Balance for Credit Risk to be Evaluated on a Homogeneous Basis
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
Fair Value Measurement Inputs and Valuation Techniques [Table]
Fair Value Measurement Inputs and Valuation Techniques [Table]
Valuation Approach and Technique [Axis]
Valuation Approach and Technique [Axis]
Valuation Approach and Technique [Domain]
Valuation Approach and Technique [Domain]
Third-Party Technique
Third-Party Technique [Member]
Third-Party Technique [Member]
Measurement Input Type [Axis]
Measurement Input Type [Axis]
Measurement Input Type [Domain]
Measurement Input Type [Domain]
Mainly value of taxi medallions
Measurement Input, Value Of Taxi Medallions [Member]
Measurement Input, Value Of Taxi Medallions [Member]
Adjustments for comparable properties
Measurement Input, Comparability Adjustment [Member]
Adjustments by management to reflect current conditions/selling costs
Measurement Input, Cost to Sell [Member]
Discount rates
Measurement Input, Discount Rate [Member]
Prepayment speeds
Measurement Input, Prepayment Rate [Member]
Multi-family
Multi-family financing [Member]
Multi-family financing [Member]
Mortgage servicing rights
Mortgage Servicing Rights [Member]
Mortgage Servicing Rights [Member]
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]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets taken in foreclosure, defaulted loans and facilities held for sale
Mortgage servicing rights
Servicing Asset at Fair Value, Amount
Impaired loans, measurement input
Impaired Loans, Measurement Input
Impaired Loans, Measurement Input
Assets taken in foreclosure, measurement input
Other Real Estate, Foreclosed Assets, And Repossessed Asset, Measurement Input
Other Real Estate, Foreclosed Assets, And Repossessed Asset, Measurement Input
Mortgage servicing rights, measurement input
Servicing Asset, Measurement Input
Schedule of Financing Receivable, Troubled Debt Restructurings [Table]
Schedule of Financing Receivable, Troubled Debt Restructurings [Table]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications [Line Items]
Current loans
Non-accrual
Borrowings, Senior Notes and Subordinated Notes
Debt Disclosure [Text Block]
Schedule of Goodwill
Schedule of Goodwill [Table Text Block]
Schedule of Finite-Lived Intangible Assets
Schedule of Finite-Lived Intangible Assets [Table Text Block]
Future amortization expense
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
Off-Balance-Sheet Financial Instruments
Concentration Risk Disclosure [Text Block]
Interest and dividend income
Interest and Dividend Income, Operating
Interest expense
Interest Expense
Net interest income
Interest Income (Expense), Net
Provisions for loan losses
Provision for Loan and Lease Losses
Non-interest income
Noninterest Income
Non-interest expense
Noninterest Expense
Income before income taxes
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest
Income tax expense
Income Tax Expense (Benefit)
Net income
Net Income (Loss) Attributable to Parent
Preferred stock dividends
Preferred Stock Dividends and Other Adjustments
Net income available to common stockholders
Net Income (Loss) Available to Common Stockholders, Basic
Basic (USD per share)
Earnings Per Share, Basic
Diluted (USD per share)
Earnings Per Share, Diluted
Deferred tax adjustment related to reduction in federal income tax rate
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount
Merger-related expense
Business Combination, Acquisition Related Costs
Other restructuring charges
Asset Impairment, Severance, And Retention Charges
Asset Impairment, Severance, And Retention Charges
CRE
Commercial Real Estate Portfolio Segment [Member]
Multi-family
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]
Beginning balance
Charge-offs
Financing Receivable, Allowance for Credit Losses, Write-downs
Recoveries
Financing Receivable, Allowance for Credit Losses, Recovery
Net charge-offs
Allowance For Doubtful Accounts Receivable, Charge-Offs (Recoveries), Net
Allowance For Doubtful Accounts Receivable, Charge-Offs (Recoveries), Net
Provision
Provision for Loan, Lease, and Other Losses
Ending balance
Annualized net charge-offs to average loans outstanding
Net Charge Offs To Average Gross Loans Annualized
Net charge offs to average gross loans annualized.
Loan origination commitments
Loan Origination Commitments [Member]
Unused lines of credit
Unused lines of Credit [Member]
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 Measurement Inputs and Valuation Techniques [Table Text Block]
Carrying amounts and estimated fair value of financial assets and liabilities
Fair Value, by Balance Sheet Grouping [Table Text Block]
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
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/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
Schedule of Available-for-sale Securities [Table]
Schedule of Available-for-sale Securities [Table]
Corporate bonds
State and municipal
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale [Line Items]
Gross unrealized gains
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax
Gross unrealized losses
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax
Held to maturity
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Gross unrealized gains
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain
Gross unrealized losses
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss
Fair value
Number
Financing Receivable, Modifications, Number of Contracts
Recorded investment, Pre-modification
Financing Receivable, Modifications, Pre-Modification Recorded Investment
Recorded investment, Post-modification
Financing Receivable, Modifications, Post-Modification Recorded Investment
Fair value, less than 12 months
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months
Unrealized losses, less than 12 months
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss
Fair value, 12 months or longer
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer
Unrealized losses, 12 months or longer
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss
Fair value, total
Debt Securities, Available-for-sale, Unrealized Loss Position
Unrealized losses, total
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss
Stock-Based Compensation
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
Less than one year
Time Deposit Maturities, Next Twelve Months
One to two years
Time Deposit Maturities, Year Two
Two to three years
Time Deposit Maturities, Year Three
Three to four years
Time Deposit Maturities, Year Four
Four to five years
Time Deposit Maturities, Year Five
Total certificates of deposit
Certificates Of Deposit
Certificates of deposit.
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 year
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
Charge-offs
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities, Accretable Yield, Charge-Offs Of Loan
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities, Accretable Yield, Charge-Offs Of Loan
Disposals
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Disposals of Loans
Reclassifications to non-accretable difference
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Transfers to Loans Held-for-sale
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 year
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2019
Operating Leases, Future Minimum Payments Due, Next Twelve Months
2020
Operating Leases, Future Minimum Payments, Due in Two Years
2021
Operating Leases, Future Minimum Payments, Due in Three Years
2022
Operating Leases, Future Minimum Payments, Due in Four Years
2023
Operating Leases, Future Minimum Payments, Due in Five Years
2024 and thereafter
Operating Leases, Future Minimum Payments, Due Thereafter
Total future minimum payments
Operating Leases, Future Minimum Payments Due
Rent expense
Operating Leases, Rent Expense
Schedule of Other Non-interest Expense
Other non- interest expense [Table Text Block]
Other non- interest expense [Table Text Block]
Accumulated Other Comprehensive Loss
Comprehensive Income (Loss) Note [Text Block]
Health care cost trend rate assumed for the next year
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year
Rate to which the cost trend rate is assumed to decline (the “ultimate trend rate”)
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate
Year that ultimate trend rate is reached
Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate
On percentage point increase, effect on total service and interest cost components
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components
On percentage point increase, effect on the post retirement benefit obligation
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation
On percentage point decrease, effect on total service and interest cost components
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components
On percentage point decrease, effect on the post retirement benefit obligation
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation
Schedule of off-balance-sheet financial instruments
Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Disposal Group Classification [Axis]
Disposal Group Classification [Axis]
Disposal Group Classification [Domain]
Disposal Group Classification [Domain]
Disposal Group, Held-for-sale, Not Discontinued Operations
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Retirement Plan Name [Axis]
Retirement Plan Name [Axis]
Retirement Plan Name [Domain]
Retirement Plan Name [Domain]
Astoria Bank Pension Plan
Astoria Bank Pension Plan [Member]
Astoria Bank Pension Plan [Member]
Pension Plans Excluding Astoria
Pension Plans Excluding Astoria [Member]
Pension Plans Excluding Astoria [Member]
Employee Savings Plan
Employee Savings Plan [Member]
Employee Savings Plan [Member]
Liquidity funds
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Over funded amount included in other assets
Employer contributions to fund pension plan
Maximum contribution by employee, percent
Defined Contribution Plan, Maximum Contribution by Employee, Percent
Defined Contribution Plan, Maximum Contribution by Employee, Percent
Maximum annual contribution per employee, percent
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent
Savings plan expense
Defined Contribution Plan, Cost
Condensed Financial Information Disclosure [Abstract]
Schedule of Condensed Financial Statements [Table]
Condensed Financial Statements [Table]
Condensed Financial Statements, Captions [Line Items]
Condensed Financial Statements, Captions [Line Items]
Assets:
Cash
Cash and Cash Equivalents, at Carrying Value
Investment in the Bank
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures
Trade name
Indefinite-Lived Trade Names
Liabilities:
Senior Notes
Other liabilities
Stockholders’ equity
Fair Value, Measurements, Recurring
Fair Value, Measurements, Recurring [Member]
Fair Value, Net Asset (Liability) [Abstract]
Fair Value, Net Asset (Liability) [Abstract]
Investment securities available for sale:
Investment Securities Available For Sale [Abstract]
Investment securities available for sale.
Securities available for sale
Swaps
Total assets
Assets, Fair Value Disclosure
Swaps, liabilities
Total liabilities
Financial and Nonfinancial Liabilities, Fair Value Disclosure
Summary of major classification of deposits
Schedule Of Major Classification Of Deposits [Table Text Block]
Major classification of deposits.
Schedule of Maturities of Deposits
Schedule of Maturities of Deposits [Table Text Block]
Schedule of Maturities of Deposits [Table Text Block]
List of Company's Brokered deposits
Schedule of List of Brokered Deposits [Table Text Block]
Schedule of list of brokered deposits.
FHLB advances and overnight
Federal Home Loan Bank Advances [Member]
Repurchase agreements
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Member]
Subordinated Notes
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.
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
Earnings Per Share [Abstract]
Computation of basic and diluted earnings per share:
Earnings Per Share, Basic and Diluted [Abstract]
Net income available to common stockholders
Weighted average common shares outstanding for computation of basic EPS (in shares)
Weighted Average Number of Shares Outstanding, Basic
Common-equivalent shares due to the dilutive effect of stock options (in shares)
Weighted Average Number Diluted Shares Outstanding Adjustment
Weighted average common shares for computation of diluted EPS (in shares)
Weighted Average Number of Shares Outstanding, Diluted
Basic (loss) earnings per common share (USD per share)
Diluted (loss) earnings per common share (USD per share)
Weighted average common shares that could be exercised that were anti-dilutive for the period (in shares)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Tier One Risk Based Capital [Abstract]
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), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax
Net accumulated other comprehensive income components
Tier 1 risk-based capital
Tier Two Risk Based Capital [Abstract]
Tier Two Risk Based Capital [Abstract]
Tier 2 capital
Allowance for loan losses and off-balance sheet commitments
Total risk-based capital
Summary of Company's stock option activity
Share-based Compensation, Stock Options, Activity [Table Text Block]
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
Schedule of stock-based compensation expense associated with stock options and non-vested stock awards
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
Schedule of debt
Schedule of Debt [Table Text Block]
2019
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months
2020
Finite-Lived Intangible Assets, Amortization Expense, Year Two
2021
Finite-Lived Intangible Assets, Amortization Expense, Year Three
2022
Finite-Lived Intangible Assets, Amortization Expense, Year Four
2023
Finite-Lived Intangible Assets, Amortization Expense, Year Five
Thereafter
Finite-Lived Intangible Assets, Amortization Expense, after Year Five
Total
Finite-Lived Intangible Assets, Net
Activity in Investments in Low Income Housing Tax Credits
Activity in Affordable Housing Program Obligation [Table Text Block]
Schedule of Finite-Lived Intangible Assets [Table]
Schedule of Finite-Lived Intangible Assets [Table]
Non-compete agreements
Noncompete Agreements [Member]
Trade name
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets [Line Items]
Gross intangible assets
Finite-Lived Intangible Assets, Gross
Accumulated amortization
Finite-Lived Intangible Assets, Accumulated Amortization
Net intangible assets
Amortization of intangible assets
Amortization of Intangible Assets
Factored receivables
Loans acquired transferred to originated
Loans And Leases Receivable, Gross, Reclassified From Acquired To Originated
Loans And Leases Receivable, Gross, Reclassified From Acquired To Originated
Loans And Leases Receivable, Allowance, Transfered From Acquired To Origniated
Loans And Leases Receivable, Allowance, Transfered From Acquired To Origniated
Loans And Leases Receivable, Allowance, Transfered From Acquired To Origniated
Net deferred loan origination costs
Purchase accounting adjustments to loans
Business Combination, Provisional Information, Initial Accounting Incomplete, Loans
Business Combination, Provisional Information, Initial Accounting Incomplete, Loans
Pledged loans
recorded investment of PCI non-accrual loans, transferred from acquired to originated
Financing Receivable, Recorded Investment, Nonaccrual Status, Transferred From Acquired To Originated
Financing Receivable, Recorded Investment, Nonaccrual Status, Transferred From Acquired To Originated
Loans formally in process of foreclosure
Mortgage Loans in Process of Foreclosure, Amount
PCI loans
Financing Receivable, Net
Cash-basis interest income recognized
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method
Impaired loans with related allowance recorded
Impaired Financing Receivable, with Related Allowance, Recorded Investment
Number of contracts, troubled debt restructurings
Recorded investment, pre-modification
Recorded investment, post-modification
Charge-offs
Charge Offs From Troubled Debt Restructurings
Charge Offs From Troubled Debt Restructurings
Statement of Cash Flows [Abstract]
Cash flows from operating activities:
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income
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]
Charge of asset write-downs, systems integration, severance and retention
Restructuring Costs and Asset Impairment Charges
(Gain) loss on extinguishment of borrowings
(Gain) loss and write-downs on other real estate owned
Gains (Losses) on Sales of Other Real Estate
(Gain) loss on sale of premises and equipment
Gain (Loss) on Disposition of Property Plant Equipment
Depreciation and amortization of premises and equipment
Depreciation, Depletion and Amortization
Amortization of intangibles
Amortization of low income housing tax credits
Amortization Method Qualified Affordable Housing Project Investments, Amortization
Net gains on loans held for sale
Gain (Loss) on Sales of Loans, Net
Net losses (gains) on sales of securities
Debt and Equity Securities, Gain (Loss)
Net (gain) on sale of trust division
Gain (Loss) on Disposition of Assets
Net (accretion) on loans
Accretion (Amortization) of Discounts and Premiums, Loans
Accretion (Amortization) of Discounts and Premiums, Loans
Net amortization of premiums on securities
Accretion (Amortization) of Discounts and Premiums, Investments
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 (amortization of premium) accretion of discount, on borrowings
Amortization of Debt Discount (Premium)
Restricted stock expense
Restricted Stock or Unit Expense
Stock option compensation expense
Stock or Unit Option Plan Expense
Originations of loans held for sale
Payments for Origination and Purchases of Loans Held-for-sale
Proceeds from sales of loans held for sale
Proceeds from Sale of Loans Held-for-sale
Increase in cash surrender value of BOLI
Life Insurance, Corporate or Bank Owned, Change in Value
Deferred income tax expense (benefit)
Increase (Decrease) in Deferred Income Taxes
Other adjustments (principally net changes in other assets and other liabilities)
Other Operating Activities, Cash Flow Statement
Net cash provided by operating activities
Net Cash Provided by (Used in) Operating Activities
Cash flows from investing activities:
Net Cash Provided by (Used in) Investing Activities [Abstract]
Purchases of securities:
Payments to Acquire Investments [Abstract]
Available for sale
Payments to Acquire Debt Securities, Available-for-sale
Held to maturity
Payments to Acquire Held-to-maturity Securities
Proceeds from maturities, calls and other principal payments on securities:
Proceeds from Sale, Maturity and Collection of Investments [Abstract]
Available for sale
Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale
Held to maturity
Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities
Loan originations, net
Payments for Loan originations
Cash outflows for the origination of new loans during the period.
Portfolio loans purchased
Proceeds from sale of loans held for investment
Proceeds from Sale of Loans Held-for-investment
Proceeds from sales of other real estate owned
Proceeds from Sale of Other Real Estate
Purchase of FHLB and FRB stock, net
Payments for (Proceeds from) Federal Home Loan Bank Stock
Purchase of low income housing tax credit
Payments to Acquire Affordable Housing Tax Credit
Payments to Acquire Affordable Housing Tax Credit
Redemption of and benefits received on bank owned life insurance
Proceeds from Life Insurance Policy
Purchases of premises and equipment
Payments to Acquire Property, Plant, and Equipment
Proceeds from the sale of premises and equipment
Proceeds from Sale of Property, Plant, and Equipment
Cash (paid for) received from acquisitions
Payments for (Proceeds from) Businesses and Interest in Affiliates
Net cash (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 increase in transaction, savings and money market deposits
Net Change Interest and Noninterest-bearing Deposits, Domestic
Net increase (decrease) in time deposits
Increase (Decrease) in Time Deposits
Net (decrease) increase in short-term FHLB borrowings
Increase (Decrease) in Loans from Federal Home Loan Banks
Advances of term FHLB borrowings
Proceeds from FHLBank Borrowings, Financing Activities
Repayments of term FHLB borrowings
Payments of FHLBank Borrowings, Financing Activities
Net (decrease) increase in other borrowings
Proceeds