Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 26,684	$ 21,840	$ 16,512
Other Comprehensive Income [Abstract]
Unrealized gains (losses) on available-for-sale securities, net of taxes of $(2,855), $3,848 and $(1,005) for the years ended December 31, 2017, 2016 and 2015, respectively	3,845	(6,025)	1,572
Unamortized holding gains on held to maturity securities transferred from available for sale, net of taxes of $(32), $(172) and $(193) for December 31, 2017, 2016 and 2015, respectively	80	268	302
Less: reclassification adjustment for realized gains included in net income net of taxes of $216, $465 and $176 for the years ended December 31, 2017, 2016 and 2015, respectively	(400)	(727)	(276)
Other comprehensive income (loss), net of taxes	3,525	(6,484)	1,598
Comprehensive income	$ 30,209	$ 15,356	$ 18,110