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Consolidated Statements of Financial Condition (Parenthetical) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Loans receivable, allowance for loan losses $ 20,640 $ 17,375
Preferred stock, par value per share $ 0.01 $ 0.01
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, shares issued 7,807 1,342
Preferred stock, shares outstanding 7,807  
Common stock, no par value $ 0 $ 0
Common stock, shares authorized 20,000,000 20,000,000
Common stock, shares issued 18,313,476 17,572,942
Common stock, shares outstanding 15,782,713 15,042,179
Treasury stock, shares 2,530,763 2,530,763
Series C Preferred Stock [Member]    
Preferred stock, dividend rate 6.00% 6.00%
Series D Preferred Stock [Member]    
Preferred stock, dividend rate 4.50% 4.50%
Preferred stock, liquidation preference per share $ 10,000 $ 10,000
Series F Preferred Stock [Member]    
Preferred stock, shares outstanding 6,465  
Preferred stock, dividend rate 6.00%  
Preferred stock, liquidation preference per share $ 1,000