CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net Income		$ 10,903	$ 6,456	$ 29,165	$ 19,260
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 $405, ($1,649), ($5,599) and ($1,723), respectively		(752)	3,064	10,399	3,202
Net reclassification adjustment for gains included in net income, net of tax of $0, $1, $1 and $1, respectively	[1]	0	(3)	(3)	(3)
Net change in unrealized gains (losses) on available-for-sale securities, net of tax		(752)	3,061	10,396	3,199
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 ($107), $1,221, $1,859, and $1,115, respectively		199	(2,267)	(3,453)	(2,070)
Net reclassification adjustment for effective portion of cash flow hedges included in interest expense, net of tax of ($187), ($271), ($532) and ($447), respectively	[2]	347	504	989	829
Net change in unrealized gains (losses) on cash flow hedging derivatives, net of tax		546	(1,763)	(2,464)	(1,241)
Reclassification of amortization of net unrecognized actuarial loss and prior service cost, net of tax of ($20), ($20), ($62) and ($61), respectively	[3]	39	39	115	116
Other comprehensive income (loss)		(167)	1,337	8,047	2,074
Comprehensive Income		$ 10,736	$ 7,793	$ 37,212	$ 21,334

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

[2] Reclassified into the consolidated statements of income in interest on subordinated debentures.

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