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Consolidated Statements of Financial Condition (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
Loans receivable, allowance for loan losses $ 31,760 $ 31,760 $ 23,734
Preferred stock, par value per share $ 0.01 $ 0.01 $ 0.01
Preferred stock, shares authorized 10,000,000 10,000,000 10,000,000
Preferred stock, shares issued 2,371 2,371 8,340
Preferred stock, shares outstanding 2,371 2,371 8,340
Common stock, no par value $ 0 $ 0 $ 0
Common stock, shares authorized 40,000,000 40,000,000 40,000,000
Common stock, shares issued 19,548,409 19,548,409 19,484,046
Common stock, shares outstanding 17,081,191 17,081,191 17,516,828
Treasury stock, shares 2,467,218 2,467,218 1,967,218
Series C Preferred Stock [Member]      
Preferred stock, dividend rate 6.00% 6.00% 6.00%
Series D Preferred Stock [Member]      
Preferred stock, dividend rate 4.50% 4.50% 4.50%
Series G Preferred Stock [Member]      
Preferred stock, dividend rate 6.00% 6.00% 6.00%
Preferred stock, liquidation preference per share     $ 10,000
Series H Preferred Stock [Member]      
Preferred stock, dividend rate 3.50% 3.50%  
Preferred stock, liquidation preference per share $ 10,000 $ 10,000  
Series F Preferred Stock [Member]      
Preferred stock, dividend rate 6.00% 6.00% 6.00%
Preferred stock, liquidation preference per share     $ 1,000