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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Statement of Financial Position [Abstract]    
Securities held to maturity, fair values $ 93,410 $ 100,961
Preferred stock, par value (in usd per share) $ 1 $ 1
Preferred stock, shares authorized 5,000,000 5,000,000
Liquidation preference (in usd per share) $ 10,000 $ 10,000
Preferred stock, shares issued 13,750 8,000
Preferred stock, shares outstanding 13,750 8,000
Common stock, par value (in usd per share) $ 1 $ 1
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 41,081,701 41,139,537
Common stock, shares outstanding 41,081,701 41,139,537