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Consolidated Statements of Financial Condition (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Securities held to maturity, allowance for credit losses $ 13 $ 0
Securities held to maturity, fair value 354,571 363,259
Loans, allowance for credit losses 43,356 30,482
Debt issuance costs $ 709 $ 727
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 16,099,556
Treasury stock, shares 80,172 96,657
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%
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%