Other Comprehensive Income - Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pre Tax Amount
Total other comprehensive (loss) income	$ (63,312)	$ 403,620
Tax Benefit (Expense)
Total other comprehensive (loss) income	16,790	(90,292)
After Tax Amount
Before reclassifications	(56,158)	48,779
Less: reclassification adjustments	(9,636)	(264,549)
Total other comprehensive (loss) income	(46,522)	313,328
Unrealized (losses) gains on securities available for sale:
Pre Tax Amount
Before reclassifications	(37,085)	42,301
Less: reclassification adjustments	0	(333,170)
Total other comprehensive (loss) income	(37,085)	375,471
Tax Benefit (Expense)
Before reclassifications	9,526	(8,810)
Less: reclassification adjustments	0	74,630
Total other comprehensive (loss) income	9,526	(83,440)
After Tax Amount
Before reclassifications	(27,559)	33,491
Less: reclassification adjustments	0	(258,540)
Total other comprehensive (loss) income	(27,559)	292,031
Unrealized (losses) gains on cash flow hedges:
Pre Tax Amount
Before reclassifications	(39,555)	19,746
Less: reclassification adjustments	(14,041)	(8,905)
Total other comprehensive (loss) income	(25,514)	28,651
Tax Benefit (Expense)
Before reclassifications	10,956	(4,458)
Less: reclassification adjustments	3,889	2,515
Total other comprehensive (loss) income	7,067	(6,973)
After Tax Amount
Before reclassifications	(28,599)	15,288
Less: reclassification adjustments	(10,152)	(6,390)
Total other comprehensive (loss) income	(18,447)	21,678
Defined benefit pension plans:
Pre Tax Amount
Total other comprehensive (loss) income	(713)	(502)
Tax Benefit (Expense)
Total other comprehensive (loss) income	197	121
After Tax Amount
Before reclassifications	0	0
Less: reclassification adjustments	516	381
Total other comprehensive (loss) income	(516)	(381)
Change in actuarial net loss
Pre Tax Amount
Before reclassifications	0	0
Tax Benefit (Expense)
Before reclassifications	0	0
After Tax Amount
Before reclassifications	0	0
Less: amortization of actuarial net loss
Pre Tax Amount
Less: reclassification adjustments	(1,775)	(2,468)
Tax Benefit (Expense)
Less: reclassification adjustments	492	697
After Tax Amount
Less: reclassification adjustments	(1,283)	(1,771)
Less: accretion of prior service credit
Pre Tax Amount
Less: reclassification adjustments	2,488	2,970
Tax Benefit (Expense)
Less: reclassification adjustments	(689)	(818)
After Tax Amount
Less: reclassification adjustments	$ 1,799	$ 2,152