(Parent Company Only) Financial Information - Summary of Statements of Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income
Total interest income	$ 148,055	$ 116,417	$ 80,262
Interest expense	8,467	6,930	5,355
Other expenses	13,515	12,209	9,988
Income tax benefit	14,889	13,527	4,544
Net income	29,202	22,141	5,696
Parent Company [Member]
Income
Interest/other	352	115	43
Dividends from subsidiary Bank	0	0	0
Total interest income	352	115	43
Interest expense	2,115	1,671	1,053
Other expenses	462	317	1,000
Loss before income tax benefit and equity in undistributed income of subsidiaries	(2,225)	(1,873)	(2,010)
Income tax benefit	(801)	(661)	(704)
Income (loss) before equity in undistributed income of subsidiaries	(1,424)	(1,212)	(1,306)
Equity in undistributed income of subsidiaries	30,626	23,353	7,002
Net income	$ 29,202	$ 22,141	$ 5,696