Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net income	$ 41,027	$ 37,187	$ 34,822
Other comprehensive income (loss), net of tax:
Unrealized (losses) gains arising during the period (net of tax of ($1,171), ($839), and $2,383, respectively)	(2,176)	(1,558)	4,423
Unrealized (losses) gains on hedging instruments:
Unrealized (losses) gains arising during the period (net of tax of $24, ($41), and $0, respectively)	44	(76)
Minimum pension liability adjustment (net of tax of $1, $61, and ($69), respectively)	1	114	(127)
Reclassification adjustment for impairment of equity security realized in income (net of tax of $0, $36, and $0, respectively)		67
Reclassification adjustment for securities losses reclassified out of other comprehensive income into loss on sale of securities available-for-sale (net of tax of $0, $0, and $3, respectively)			6
Other comprehensive (loss) income	(2,131)	(1,453)	4,302
Comprehensive income	$ 38,896	$ 35,734	$ 39,124