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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Available-for-sale securities encumbered $ 100,819 $ 216,262
Estimated Fair Value 3,965 3,691
Held-to-maturity securities encumbered $ 435 $ 2,114
Preferred stock, par value (usd per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (shares) 10,000,000 10,000,000
Preferred stock, shares issued (shares) 0 0
Preferred stock, shares outstanding (shares) 0 0
Common stock, par value (usd per share) $ 0.01 $ 0.01
Common stock, shares authorized (shares) 150,000,000 150,000,000
Common stock, shares issued (shares) 58,226,326 58,226,326
Common stock, shares outstanding (shares) 45,937,659 48,402,083
Treasury stock, shares (shares) 12,288,667 9,824,243