CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 34,612	$ 33,710	$ 111,278	$ 84,857
Securities:
Net change in unrealized gain/(loss) on securities	19,851	(8,060)	78,238	(36,395)
Reclassification adjustment for net (gains)/losses realized in net income	(2,013)	145	(7,168)	(1,037)
Income taxes	(4,577)	2,078	(18,241)	9,586
Other comprehensive income/(loss) on securities	13,261	(5,837)	52,829	(27,846)
Derivatives used in cash flow hedging relationships:
Net change in unrealized gain/(loss) on derivatives	(800)	395	(4,568)	2,991
Reclassification adjustment for net losses on derivatives realized in net income	27	242	279	469
Income taxes	161	(79)	897	(682)
Other comprehensive income/(loss) on cash flow hedges	(612)	558	(3,392)	2,778
Other comprehensive income/(loss)	12,649	(5,279)	49,437	(25,068)
TOTAL COMPREHENSIVE INCOME	$ 47,261	$ 28,431	$ 160,715	$ 59,789