Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 8,390	$ 6,264
Other Comprehensive Income [Abstract]
Unrealized gains (losses) on available-for-sale securities, net of taxes of $2,540 and $(2,037) for three months ended March 31, 2018 and 2017, respectively.	(6,221)	3,189
Amortized holding losses on held-to-maturity securities transferred from available-for-sale, net of taxes of $(8) and $(11) for three months ended March 31, 2018 and 2017, respectively.	20	17
Less: reclassification adjustment for realized gains included in net income, net of taxes of $6 and $0 for three months ended March 31, 2018 and 2017, respectively.	(14)	0
Other comprehensive income (loss), net of taxes	(6,215)	3,206
Comprehensive income	$ 2,175	$ 9,470