CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 31,286	$ 35,626	$ 64,513	$ 48,456
Other comprehensive income/(loss) before taxes:
Net unrealized (losses)/gains on available-for-sale securities	(37,389)	42,527	28,975	(56,789)
Net changes in held-to-maturity securities	(1,653)	(2,496)	(3,810)	(8,184)
Net unrealized (losses)/gains on cash flow hedges	(5,274)	(2,132)	13,641	(30,388)
Other comprehensive (loss)/income before tax	(44,316)	37,899	38,806	(95,361)
Income tax benefit/(expense) related to other comprehensive (loss)/income	9,305	(7,959)	(8,150)	20,025
Other comprehensive (loss)/income net of tax	(35,011)	29,940	30,656	(75,336)
Comprehensive (loss)/income	$ (3,725)	$ 65,566	$ 95,169	$ (26,880)