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Consolidated Statements Of Financial Condition (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Securities held to maturity, fair value $ 363,259 $ 439,581  
Loans, allowance for loan losses 30,482 33,914  
Debt issuance costs $ 727 $ 798  
Preferred stock, par value $ 100    
Preferred stock, shares authorized 210,000    
Preferred stock, shares issued 173,282 173,282  
Common stock, par value $ 0.01 $ 0.01  
Common stock, shares authorized 50,000,000 50,000,000  
Common stock, shares issued 16,099,556 16,056,178 16,056,178
Treasury stock, shares 96,657 127,580  
Series A 3% Preferred Stock [Member]      
Preferred stock, par value $ 100 $ 100  
Preferred stock, shares authorized 1,533 1,533  
Preferred stock, shares issued 1,435 1,435  
Preferred stock, dividend percentage 3.00% 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% 8.48%