Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Investment securities, held to maturity fair value	$ 219,891	$ 208,273
Allowance for loan losses	$ 18,305	$ 17,820
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	99,000,000	99,000,000
Common stock, shares issued	45,086,441	38,400,476
Common stock, shares outstanding	45,061,372	38,375,407