Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Investment securities held to maturity; fair value	$ 135,085	$ 146,990
Common stock, par value
Common stock, shares authorized	70,000,000	70,000,000
Common stock, shares issued	47,352,714	47,222,914