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Fair Value Measurements and Fair Values of Financial Instruments (Carrying Values and Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	$ 99,756	$ 91,613
Equity investments	17,717	2,500
Carrying Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	261,229	550,353
Interest-earning time deposits	735	735
Debt securities available for sale	99,756	91,613
Equity investments	17,717	2,500
Loans held for sale	3,530	917
Loans receivable, net	2,295,021	2,178,407
FHLB of New York stock, at cost	11,324	13,821
Accrued interest receivable	12,924	8,318
Deposits	2,318,050	2,362,063
Debt	191,161	245,800
Subordinated debentures	37,042	36,810
Accrued interest payable	1,463	2,708
Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	261,229	550,353
Interest-earning time deposits	735	735
Debt securities available for sale	99,756	91,613
Equity investments	17,717	2,500
Loans held for sale	3,530	917
Loans receivable, net	2,309,118	2,199,497
FHLB of New York stock, at cost	11,324	13,821
Accrued interest receivable	12,924	8,318
Deposits	2,323,561	2,375,089
Debt	194,899	247,176
Subordinated debentures	37,252	36,947
Accrued interest payable	1,463	2,708
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	261,229	550,353
Equity investments	17,717	2,500
Deposits	1,627,871	1,231,658
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest-earning time deposits	735	735
Debt securities available for sale	99,756	91,613
Loans held for sale	3,530	917
FHLB of New York stock, at cost	11,324	13,821
Accrued interest receivable	12,924	8,318
Deposits	695,690	1,143,431
Debt	194,899	247,176
Subordinated debentures	37,252	36,947
Accrued interest payable	1,463	2,708
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable, net	$ 2,309,118	$ 2,199,497

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Fair value of subordinated debt obligations including, but not limited to, subordinated loan, subordinated bond, subordinated debenture or junior debt.

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Fair value portion of receivables, including, but not limited to, trade account receivables, note receivables, and loan receivables.

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