CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 25,492	$ 17,833	$ 73,948	$ 77,048
Other comprehensive income/(loss) before taxes:
Net unrealized gains/(losses) on available-for-sale securities	47,235	(24,925)	(9,554)	(50,272)
Net changes in held-to-maturity securities	(2,523)	(6,543)	(10,707)	(13,406)
Net unrealized gains/(losses) on cash flow hedges	2,959	(6,736)	(27,429)	(22,373)
Other comprehensive income/(loss) before tax	47,671	(38,204)	(47,690)	(86,051)
Income tax (expense)/benefit related to other comprehensive income/(loss)	(10,011)	8,023	10,014	18,071
Other comprehensive income/(loss) net of tax	37,660	(30,181)	(37,676)	(67,980)
Comprehensive income/(loss)	$ 63,152	$ (12,348)	$ 36,272	$ 9,068