CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 8,617	$ 3,632	$ 19,386	$ 12,349
Other comprehensive income (loss), before tax:
Changes in unrealized loss on securities available-for-sale	512	(5,577)	5,119	3,041
Changes in unrealized loss on derivative hedges	(84)	(92)	(805)	(1,309)
Changes in unrealized loss on pension	5	8	45	86
Income taxes related to other comprehensive income (loss):
Changes in unrealized loss on securities available-for-sale	(192)	1,952	(1,839)	(1,064)
Changes in unrealized loss on derivative hedges	31	32	373	458
Changes in unrealized loss on pension	(2)	(3)	(2)	(30)
Total other comprehensive income	270	(3,680)	2,891	1,182
Total comprehensive income	$ 8,887	$ (48)	$ 22,277	$ 13,531