Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 20,970	$ 15,160	$ 40,979	$ 30,869
Securities:
Net change in unrealized gain (loss) on securities	3,903	(2,764)	23,970	8,714
Reclassification adjustment for net gains realized in net income	(4,622)	(3,110)	(8,378)	(7,463)
Net change in non-credit related other than temporary impairment	0	24	7	48
Income taxes	289	2,361	(6,235)	(498)
Other comprehensive income (loss) on securities	(430)	(3,489)	9,364	801
Derivatives used in cash flow hedging relationships:
Net change in unrealized gain (loss) on derivatives	(2,044)	1,509	(5,467)	55
Reclassification adjustment for net losses on derivatives realized in net income	465	559	971	1,123
Income taxes	598	(775)	1,672	(448)
Other comprehensive income (loss) on cash flow hedges	(981)	1,293	(2,824)	730
Other comprehensive income (loss)	(1,411)	(2,196)	6,540	1,531
TOTAL COMPREHENSIVE INCOME	$ 19,559	$ 12,964	$ 47,519	$ 32,400