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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, 2023
Sep. 30, 2023
Dec. 31, 2022
Securities available for sale, at fair value, amortized cost $ 1,061,181 $ 1,061,181 $ 1,127,057
Securities held to maturity, allowance for credit losses 4 4 5
Securities held to maturity, fair value 136,540 136,540 174,188
Loans, allowance for credit losses 49,630 49,630 45,413
Debt issuance costs $ 623 $ 623 $ 778
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 697,756 697,756 759,555
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 171,486 171,486 171,486
Preferred stock, dividend percentage 8.48% 8.48% 8.48%