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	$ 21,189	$ 15,289	$ 58,318	$ 40,797
Unrealized gains (losses) on securities:
Unrealized holding gains (losses) on securities arising during the period	329	261	15,256	(4,703)
Income tax effect	(124)	(98)	(5,721)	1,720
Less: reclassification adjustment for (gains) losses on securities included in net income	1	16	(25)	85
Income tax effect	0	(6)	9	(32)
Net unrealized gains (losses)	206	173	9,519	(2,930)
Unrealized gains (losses) on cash flow hedges:
Unrealized gains (losses) on cash flow hedges arising during the period	890	(2,341)	(2,523)	(3,841)
Income tax effect	(334)	877	946	1,488
Less: reclassification adjustment for losses included in net income	703	0	1,306	0
Income tax effect	(264)	0	(490)	0
Net unrealized gains (losses)	995	(1,464)	(761)	(2,353)
Other comprehensive income (loss), net of tax	1,201	(1,291)	8,758	(5,283)
Comprehensive income	$ 22,390	$ 13,998	$ 67,076	$ 35,514