CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) income	$ (399,311)	$ 58,201
Unrealized gains on securities available-for-sale:
Net unrealized gains, net of income taxes of $15,149 and $6,783	48,126	22,593
Less reclassification adjustments for gains (losses) realized in net income, net of income taxes of $710 and $(3)	2,284	(9)
Net change in unrealized gains on securities available-for-sale, net of tax	45,842	22,602
Unrealized gains (losses) on derivative instruments designated as cash flow hedges:
Net unrealized gains (losses), net of income taxes of $40,919 and $11,112	126,314	37,011
Less reclassification adjustments for gains (losses) realized in net income, net of income taxes of $1,922 and $(348)	6,185	(1,160)
Net change in unrealized gains (losses) on derivative instruments, net of tax	120,129	38,171
Other comprehensive income, net of tax	165,971	60,773
Comprehensive (loss) income	$ (233,340)	$ 118,974