Other Comprehensive Income - Schedule of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pre Tax Amount
Total other comprehensive income (loss)	$ 30,054	$ 404,700	$ (1,119,774)
Tax (Expense) Benefit
Total other comprehensive income (loss)	(6,031)	(89,860)	253,278
After Tax Amount
Before reclassifications	(23,742)	33,908	(869,941)
Less: reclassification adjustments	(47,765)	(280,932)	(3,445)
Total other comprehensive income (loss)	24,023	314,840	(866,496)
Accretion of gains from terminated interest rate swaps	0	(46)	(10,193)
Total realized gain, net of tax		41,200
Balance of gain after amortization, net of tax			100
Change in fair value of securities available for sale
Pre Tax Amount
Before reclassifications	(19,461)	47,104	(1,061,859)
Less: reclassification adjustments	(16,798)	(333,170)	(3,157)
Total other comprehensive income (loss)	(2,663)	380,274	(1,058,702)
Tax (Expense) Benefit
Before reclassifications	7,684	(9,731)	238,005
Less: reclassification adjustments	4,653	74,630	873
Total other comprehensive income (loss)	3,031	(84,361)	237,132
After Tax Amount
Before reclassifications	(11,777)	37,373	(823,854)
Less: reclassification adjustments	(12,145)	(258,540)	(2,284)
Total other comprehensive income (loss)	368	295,913	(821,570)
Unrealized losses on cash flow hedges:
Pre Tax Amount
Before reclassifications	(45,096)	(24,855)	(69,010)
Less: reclassification adjustments	(52,151)	(48,795)	9,580
Total other comprehensive income (loss)	7,055	23,940	(78,590)
Tax (Expense) Benefit
Before reclassifications	12,492	8,165	18,377
Less: reclassification adjustments	14,446	13,517	(2,693)
Total other comprehensive income (loss)	(1,954)	(5,352)	21,070
After Tax Amount
Before reclassifications	(32,604)	(16,690)	(50,633)
Less: reclassification adjustments	(37,705)	(35,278)	6,887
Total other comprehensive income (loss)	5,101	18,588	(57,520)
Defined Benefit Pension Plans
Pre Tax Amount
Total other comprehensive income (loss)	25,662	486	17,518
Tax (Expense) Benefit
Total other comprehensive income (loss)	(7,108)	(147)	(4,924)
After Tax Amount
Before reclassifications	20,639	13,225	4,546
Less: reclassification adjustments	2,085	12,886	(8,048)
Total other comprehensive income (loss)	18,554	339	12,594
Change in actuarial net loss
Pre Tax Amount
Before reclassifications	28,546	19,742	6,323
Tax (Expense) Benefit
Before reclassifications	(7,907)	(5,547)	(1,777)
After Tax Amount
Before reclassifications	20,639	14,195	4,546
BEP and Defined Benefit Plan amendments - accelerated vesting
Pre Tax Amount
Before reclassifications		(1,351)
Tax (Expense) Benefit
Before reclassifications		381
After Tax Amount
Before reclassifications		(970)
Less: amortization of actuarial net loss
Pre Tax Amount
Less: reclassification adjustments	(7,098)	(9,563)	(11,032)
Tax (Expense) Benefit
Less: reclassification adjustments	1,966	2,693	3,101
After Tax Amount
Less: reclassification adjustments	(5,132)	(6,870)	(7,931)
Less: BEP and Defined Benefit Plan curtailment gain
Pre Tax Amount
Less: reclassification adjustments		15,908
Tax (Expense) Benefit
Less: reclassification adjustments		(4,490)
After Tax Amount
Less: reclassification adjustments		11,418
Less: Defined Benefit Plan settlement loss
Pre Tax Amount
Less: reclassification adjustments	29		(12,045)
Tax (Expense) Benefit
Less: reclassification adjustments	(8)		3,386
After Tax Amount
Less: reclassification adjustments	21		(8,659)
Less: net accretion of prior service credit
Pre Tax Amount
Less: reclassification adjustments	9,953	11,560	11,882
Tax (Expense) Benefit
Less: reclassification adjustments	(2,757)	(3,222)	(3,340)
After Tax Amount
Less: reclassification adjustments	$ 7,196	8,338	8,542
Interest rate swaps
After Tax Amount
Accretion of gains from terminated interest rate swaps		$ 100	$ 7,300