Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 149,129	$ 116,998	$ 75,272
Securities:
Net change in unrealized gain (loss) on securities	52,557	(9,568)	23,778
Reclassification adjustment for net gains realized in net income	(7,659)	(1,085)	(6,764)
Income taxes	(11,429)	2,731	(6,670)
Other comprehensive income (loss) on securities	33,469	(7,922)	10,344
Derivatives used in cash flow hedging relationships:
Net change in unrealized gain (loss) on derivatives	(3,639)	816	210
Reclassification adjustment for net losses on derivatives realized in net income	(170)	(431)	(1,290)
Income taxes	(723)	220	765
Other comprehensive income (loss) on cash flow hedges	(2,746)	1,027	735
Other comprehensive income (loss)	30,723	(6,895)	11,079
TOTAL COMPREHENSIVE INCOME	$ 179,852	$ 110,103	$ 86,351