CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - 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		$ 11,339	$ 10,903	$ 31,649	$ 29,165
Net change in unrealized gains (losses) on available-for-sale securities:
Net change in unrealized gains (losses) on available-for-sale securities, net of tax of $142, $405, ($784) and ($5,599), respectively		(262)	(752)	1,458	10,399
Net reclassification adjustment for net gains included in net income, net of tax of $289, $0, $289 and $1, respectively(1)	[1]	(538)	0	(538)	(3)
Net change in unrealized gains (losses) on available-for-sale securities, net of tax		(800)	(752)	920	10,396
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract]
Net change in unrealized gains (losses) on cash flow hedging derivatives, net of tax of $43, ($107), $243 and $1,859, respectively		(80)	199	(452)	(3,453)
Net reclassification adjustment for effective portion of cash flow hedges, net of tax of ($128), ($187), ($432) and ($532), respectively(2)	[2]	238	347	802	989
Net change in unrealized gains (losses) on cash flow hedging derivatives, net of tax		158	546	350	(2,464)
Reclassification of amortization of net unrecognized actuarial loss and prior service cost, net of tax of ($23), ($20), ($69) and ($62), respectively(3)	[3]	42	39	128	115
Other comprehensive income (loss)		(600)	(167)	1,398	8,047
Comprehensive Income		$ 10,739	$ 10,736	$ 33,047	$ 37,212

[1] (1) Reclassified into the consolidated statements of income in net gain on sale of securities.

[2] (2) Reclassified into the consolidated statements of income within interest expense.

[3] (3) Reclassified into the consolidated statements of income in salaries and employee benefits.