Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Investment securities held to maturity; fair value	$ 150,932	$ 138,688
Common stock, par value
Common stock, shares authorized	100,000,000	70,000,000
Common stock, shares issued	47,486,250	47,353,864