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Consolidated Statements Of Financial Condition (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Securities held to maturity, fair value $ 493,501 $ 512,983
Loans, allowance for loan losses 35,594 34,672
Debt issuance costs $ 851 $ 869
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 50,000,000 50,000,000
Common stock, shares issued 16,056,178 16,056,178
Treasury stock, shares 154,763 131,240
Series A 3% Preferred Stock [Member]    
Preferred stock, par value $ 100 $ 100
Preferred stock, shares authorized 1,533 1,533
Preferred stock, shares issued 1,439 1,439
Preferred stock, dividend percentage 3.00% 3.00%
Series B-1 8.48% Preferred Stock [Member]    
Preferred stock, par value $ 100 $ 100
Preferred stock, shares authorized 200,000 200,000
Preferred stock, shares issued 171,847 171,847
Preferred stock, dividend percentage 8.48% 8.48%