Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 17,699	$ 13,952
Unrealized gains (losses) on securities:
Unrealized holding gains on securities arising during the period	6,867	459
Income tax effect	(2,575)	(216)
Reclassification adjustment for gains on securities included in net income	(26)	0
Income tax effect	10	0
Net unrealized gains	4,276	243
Unrealized gains (losses) on cash flow hedges:
Unrealized losses on cash flow hedges arising during the period	(2,600)	(1,946)
Income tax effect	975	778
Net unrealized losses	(1,625)	(1,168)
Other comprehensive income (loss), net of tax	2,651	(925)
Comprehensive income	$ 20,350	$ 13,027