Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Securities held to maturity, fair values	$ 86,813	$ 89,932
Preferred stock, par value (in usd per share)		$ 1
Preferred stock, shares authorized		5,000,000
Liquidation preference (per share)		$ 10,000
Preferred stock, shares issued		13,750
Preferred stock, shares outstanding		13,750
Common stock, par value (in usd per share)		$ 1
Common stock, shares authorized		100,000,000
Common stock, shares issued	50,969,908	44,795,386
Common stock, shares outstanding	50,969,908	44,795,386