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Fair Values of Financial Instruments (Carrying Values and Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | $ 82,603 | $ 99,756
Carrying Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 442,938 | 261,229
Interest-earning time deposits | 735 | 735
Debt securities available for sale | 82,603 | 99,756
Equity investments | 23,534 | 17,717
Loans held for sale | 913 | 3,530
Loans receivable, net | 2,289,854 | 2,295,021
FHLB of New York stock, at cost | 8,193 | 11,324
Accrued interest receivable | 10,388 | 12,924
Deposits | 2,541,405 | 2,318,050
Borrowings | 118,573 | 191,161
Subordinated debentures | 37,217 | 37,042
Accrued interest payable | 660 | 1,463
Fair Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 442,938 | 261,229
Interest-earning time deposits | 735 | 735
Debt securities available for sale | 82,603 | 99,756
Equity investments | 23,534 | 17,717
Loans held for sale | 913 | 3,530
Loans receivable, net | 2,237,471 | 2,309,118
FHLB of New York stock, at cost | 8,193 | 11,324
Accrued interest receivable | 10,388 | 12,924
Deposits | 2,429,607 | 2,323,561
Borrowings | 120,049 | 194,899
Subordinated debentures | 45,913 | 37,252
Accrued interest payable | 660 | 1,463
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 | 442,938 | 261,229
Equity investments | 23,534 | 17,717
Deposits | 1,750,043 | 1,627,871
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 | 82,603 | 99,756
Loans held for sale | 913 | 3,530
FHLB of New York stock, at cost | 8,193 | 11,324
Accrued interest receivable | 10,388 | 12,924
Deposits | 679,564 | 695,690
Borrowings | 120,049 | 194,899
Subordinated debentures | 45,913 | 37,252
Accrued interest payable | 660 | 1,463
Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans receivable, net | $ 2,237,471 | $ 2,309,118

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