Operating Segments - Schedule of Financial Data for Business Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Average interest earning assets (unaudited)	$ 57,317,926	$ 56,500,528	$ 48,067,381
Interest income	3,357,497	3,138,891	1,976,683
Interest expense	1,728,789	1,473,413	321,043
Net Interest Income	1,628,708	1,665,478	1,655,640
Provision for credit losses	308,830	50,184	56,817
Net Interest Income After Provision for Credit Losses	1,319,878	1,615,294	1,598,823
Non-interest income	224,501	225,729	206,793
Salary and employee benefits expense	558,595	563,591	526,737
Net occupancy expense	102,124	101,470	94,352
Technology, furniture and equipment expense	135,109	150,708	161,752
FDIC insurance assessment	61,476	88,154	22,836
Professional Fees	70,315
Professional and legal fees	70,315	80,567	82,618
Other segment items	178,241	178,201	136,654
Total non-interest expense	1,105,860	1,162,691	1,024,949
Income Before Income Taxes	$ 438,519	$ 678,332	$ 780,667
Return on average interest earning assets (pre-tax) (unaudited)	0.77%	1.20%	1.62%
Net interest margin	2.84%	2.95%	3.44%
Treasury and Corporate Other
Segment Reporting Information [Line Items]
Average interest earning assets (unaudited)	$ 7,287,340	$ 7,148,667	$ 6,137,028
Interest income	282,751	251,961	152,936
Interest expense	219,796	186,422	40,989
Net Interest Income	62,955	65,539	111,947
Provision for credit losses	(558)	4,559	481
Net Interest Income After Provision for Credit Losses	63,513	60,980	111,466
Non-interest income	11,480	26,829	5,585
Salary and employee benefits expense	50,020	62,177	77,643
Net occupancy expense	12,761	12,377	12,575
Technology, furniture and equipment expense	15,617	26,331	40,285
FDIC insurance assessment	8,757	50,297	0
Professional Fees	6,395
Professional and legal fees		10,796	19,863
Other segment items	65,952	73,363	45,201
Total non-interest expense	159,502	235,341	195,567
Income Before Income Taxes	$ (84,509)	$ (147,532)	$ (78,516)
Return on average interest earning assets (pre-tax) (unaudited)	(1.16%)	(2.06%)	(1.28%)
Net interest margin	0.86%	0.91%	1.82%
Consumer Banking | Operating Segments
Segment Reporting Information [Line Items]
Average interest earning assets (unaudited)	$ 9,914,917	$ 9,620,508	$ 8,615,542
Interest income	478,680	415,585	290,289
Interest expense	299,048	250,882	57,543
Net Interest Income	179,632	164,703	232,746
Provision for credit losses	24,561	6,162	20,880
Net Interest Income After Provision for Credit Losses	155,071	158,541	211,866
Non-interest income	135,331	105,282	98,678
Salary and employee benefits expense	118,953	111,748	104,405
Net occupancy expense	18,003	19,313	18,948
Technology, furniture and equipment expense	25,681	25,661	26,796
FDIC insurance assessment	10,448	7,380	4,692
Professional Fees	11,254
Professional and legal fees		13,016	12,441
Other segment items	58,282	48,650	47,919
Total non-interest expense	242,621	225,768	215,201
Income Before Income Taxes	$ 47,781	$ 38,055	$ 95,343
Return on average interest earning assets (pre-tax) (unaudited)	0.48%	0.40%	1.11%
Net interest margin	1.81%	1.71%	2.70%
Commercial Banking | Operating Segments
Segment Reporting Information [Line Items]
Average interest earning assets (unaudited)	$ 40,115,669	$ 39,731,353	$ 33,314,811
Interest income	2,596,066	2,471,345	1,533,458
Interest expense	1,209,945	1,036,109	222,511
Net Interest Income	1,386,121	1,435,236	1,310,947
Provision for credit losses	284,827	39,463	35,456
Net Interest Income After Provision for Credit Losses	1,101,294	1,395,773	1,275,491
Non-interest income	77,690	93,618	102,530
Salary and employee benefits expense	389,622	389,666	344,689
Net occupancy expense	71,360	69,780	62,829
Technology, furniture and equipment expense	93,811	98,716	94,671
FDIC insurance assessment	42,271	30,477	18,144
Professional Fees	52,666
Professional and legal fees		56,755	50,314
Other segment items	54,007	56,188	43,534
Total non-interest expense	703,737	701,582	614,181
Income Before Income Taxes	$ 475,247	$ 787,809	$ 763,840
Return on average interest earning assets (pre-tax) (unaudited)	1.18%	1.98%	2.29%
Net interest margin	3.45%	3.61%	3.93%