Fair Values of Financial Instruments (Carrying Values and Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities available for sale	$ 127,518	$ 91,613
Carrying Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	412,249	550,353
Interest-earning time deposits	735	735
Debt securities available for sale	127,518	91,613
Equity investments	12,683	2,500
Loans held for sale	760	917
Loans receivable, net	2,343,593	2,178,407
FHLB of New York stock, at cost	13,529	13,821
Accrued interest receivable	16,569	8,318
Other Real Estate Owned	1,623	1,623
Deposits	2,442,233	2,362,063
Borrowings	242,800	245,800
Subordinated debentures	36,926	36,810
Accrued interest payable	2,492	2,708
Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	412,249	550,353
Interest-earning time deposits	735	735
Debt securities available for sale	127,518	91,613
Equity investments	12,683	2,500
Loans held for sale	760	917
Loans receivable, net	2,406,615	2,199,497
FHLB of New York stock, at cost	13,529	13,821
Accrued interest receivable	16,569	8,318
Other Real Estate Owned	1,623	1,623
Deposits	2,452,965	2,375,089
Borrowings	245,481	245,176
Subordinated debentures	37,199	36,947
Accrued interest payable	2,492	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	412,249	550,353
Equity investments	12,683	2,500
Deposits	1,456,240	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	127,518	91,613
Loans held for sale	760	917
FHLB of New York stock, at cost	13,529	13,821
Accrued interest receivable	16,569	8,318
Deposits	996,725	1,143,431
Borrowings	245,481	245,176
Subordinated debentures	37,199	36,947
Accrued interest payable	2,492	2,708
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable, net	2,406,615	2,199,497
Other Real Estate Owned	$ 1,623	$ 1,623