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Consolidated Statements of Financial Condition (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Securities held to maturity, allowance for credit losses $ 5 $ 5 $ 7
Securities held to maturity, fair value 224,164 224,164 282,035
Loans, allowance for credit losses 45,444 45,444 52,420
Debt issuance costs $ 1,166 $ 1,166 $ 1,377
Common stock, par value $ 0.01 $ 0.01 $ 0.01
Common stock, shares authorized 50,000,000 50,000,000 50,000,000
Common stock, shares issued 16,099,556 16,099,556 16,099,556
Treasury stock, shares 257,475 257,475 57,630
Series A 3% Preferred Stock [Member]      
Preferred stock, par value $ 100 $ 100 $ 100
Preferred stock, shares authorized 1,533 1,533 1,533
Preferred stock, shares issued 1,435 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 $ 100
Preferred stock, shares authorized 200,000 200,000 200,000
Preferred stock, shares issued 171,486 171,486 171,847
Preferred stock, dividend percentage 8.48% 8.48% 8.48%