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	$ 28,061	$ 31,555	$ 28,418
Securities:
Net change in unrealized gain (loss) on securities available for sale	361	(3,746)	172
Income taxes	(139)	1,433	(65)
Other comprehensive income (loss) on securities available for sale	222	(2,313)	107
Derivatives used in cash flow hedging relationships:
Net change in unrealized gain (loss) on derivatives	1,119	242	(1,384)
Income taxes	(428)	(93)	530
Other comprehensive income (loss) on cash flow hedges	691	149	(854)
Other comprehensive income (loss), net of tax	913	(2,164)	(747)
Comprehensive income	$ 28,974	$ 29,391	$ 27,671