Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 58,583	$ 43,214	$ 32,694
Unrealized gains (losses) on securities:
Unrealized gains (losses) on available-for-sale securities arising during the period	(10,140)	17,437	(12,853)
Income tax effect	3,759	(6,103)	4,499
Reclassification adjustment for available-for-sale-security gains included in net income	85	(3,191)	(1,274)
Income tax effect	(32)	1,117	446
Net unrealized gains (losses) on securities	(6,328)	9,260	(9,182)
Unrealized losses on cash flow hedges arising during the period	(2,532)	(1,945)	0
Income tax effect	998	681	0
Net unrealized losses on cash flow hedges	(1,534)	(1,264)	0
Other comprehensive income (loss), net of income tax effect	(7,862)	7,996	(9,182)
Comprehensive income	$ 50,721	$ 51,210	$ 23,512