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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Assets    
Securities held to maturity fair value $ 473,140 $ 454,994
Stockholders' equity    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 2,500,000 2,500,000
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 49,651,494 49,651,494
Common stock in treasury, at cost (in shares) 6,220,792 5,755,040