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Consolidated Statements of Financial Condition (Parenthetical) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Securities available-for-sale, encumbered $ 26,509,000 $ 22,086,000
Securities held-to-maturity, net estimated fair value 832,815,000 761,660,000
Securities held-to-maturity, net encumbered $ 550,735,000 $ 447,276,000
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, liquidation preference $ 1,000 $ 1,000
Preferred stock, shares authorized 5,000,000 5,000,000
Preferred stock, shares issued 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 150,000,000 150,000,000
Common stock, shares issued 48,410,419  
Common stock, shares outstanding 47,951,168 32,596,893
Treasury stock, shares 459,251 969,879