Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net Income	$ 9,840	$ 11,389
Other comprehensive income before tax:
Unrealized holding gains on investment securities available-for-sale	9,419	5,617
Reclassification adjustment for gains realized in net income on securities available-for-sale	0	(51)
Reclassification adjustment for losses amortized in net income on securities held-to-maturity	337	363
Unrealized holding gains on cash flow hedges	5,526	803
Reclassification adjustments for net gains included in net income on cash flow hedges	(644)	(108)
Other comprehensive income, before tax:	14,638	6,624
Tax effect	(5,564)	(2,526)
Other comprehensive income, net of tax:	9,074	4,098
Comprehensive income	$ 18,914	$ 15,487