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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Securities held to maturity, fair value $ 394,296 $ 405,276
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 50,000,000 50,000,000
Common stock, shares issued (in shares) 46,211,894 46,211,894
Common stock, shares outstanding (in shares) 45,360,369 45,290,433
Treasury stock (in shares) 851,525 921,461
Series B Convertible Preferred Stock    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 1,000,000 1,000,000
Preferred stock, shares issued (in shares) 521,607 521,607
Preferred stock, shares outstanding (in shares) 521,607 521,607