Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 41,353	$ 33,433	$ 18,694
Unrealized gains (losses) on securities AFS:
Net unrealized holding gains (losses) arising during the period	(3,715)	2,752	(5,999)
Reclassification adjustment for net (gains) losses included in net income	212	(1,220)	(78)
Income tax (expense) benefit	946	(598)	2,370
Total other comprehensive income (loss), net of tax	(2,557)	934	(3,707)
Comprehensive income	$ 38,796	$ 34,367	$ 14,987