Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 16,301	$ 15,039	$ 12,741
Other comprehensive income (loss):
Unrealized gains (losses) on securities available for sale	(5,736)	(1,785)	3,993
Tax effect	2,007	626	(1,398)
Reclassification adjustment for realized gains on securities	(836)	(867)	(505)
Tax effect	293	303	177
Change in unfunded pension liability	166	538	(1,728)
Tax effect	(58)	(189)	605
Other comprehensive income (loss)	(4,164)	(1,374)	1,144
Comprehensive income	$ 12,137	$ 13,665	$ 13,885