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Fair Values of Financial Instruments (Carrying Values and Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | $ 127,291 | $ 114,295
Carrying Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 180,445 | 124,235
Interest-earning time deposits | 980 | 980
Debt securities available for sale | 127,291 | 114,295
Equity investments | 8,134 | 8,294
Loans held for sale | 1,405 | 1,295
Loans receivable, net | 2,119,829 | 1,643,677
FHLB of New York stock, at cost | 16,744 | 10,211
Accrued interest receivable | 7,563 | 6,153
Deposits | 1,984,876 | 1,569,370
Borrowings | 320,005 | 185,000
Subordinated debentures | 4,124 | 4,124
Accrued interest payable | 1,174 | 791
Fair Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 180,445 | 124,235
Interest-earning time deposits | 980 | 980
Debt securities available for sale | 127,291 | 114,295
Equity investments | 8,134 | 8,294
Loans held for sale | 1,405 | 1,295
Loans receivable, net | 2,070,306 | 1,643,626
FHLB of New York stock, at cost | 16,744 | 10,211
Accrued interest receivable | 7,563 | 6,153
Deposits | 1,991,258 | 1,578,382
Borrowings | 316,414 | 182,947
Subordinated debentures | 4,078 | 4,078
Accrued interest payable | 1,174 | 791
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 | 180,445 | 124,235
Interest-earning time deposits | 980 | 980
Equity investments | 8,134 | 8,294
Deposits | 935,885 | 903,155
Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available for sale | 127,291 | 114,295
Loans held for sale | 1,405 | 1,295
FHLB of New York stock, at cost | 16,744 | 10,211
Accrued interest receivable | 7,563 | 6,153
Deposits | 1,055,373 | 673,227
Borrowings | 316,414 | 182,947
Subordinated debentures | 4,078 | 4,078
Accrued interest payable | 1,174 | 791
Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans receivable, net | $ 2,070,306 | $ 1,643,626

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