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Operating Segments - Schedule of Financial Data for Business Segments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Average interest earning assets $ 57,962,900 $ 57,317,926 $ 56,500,528
Interest income 3,232,484 3,357,497 3,138,891
Interest expense 1,468,840 1,728,789 1,473,413
Net Interest Income 1,763,644 1,628,708 1,665,478
(Credit) provision for credit losses 139,774 308,830 50,184
Net Interest Income After Provision for Credit Losses 1,623,870 1,319,878 1,615,294
Non-interest income 262,126 224,501 225,729
Salary and employee benefits expense 579,520 558,595 563,591
Net occupancy expense 102,294 102,124 101,470
Technology, furniture and equipment expense 123,876 135,109 150,708
FDIC insurance assessment 39,059 61,476 88,154
Professional and legal fees 86,747 70,315 80,567
Other segment items 210,630 178,241 178,201
Total non-interest expense 1,142,126 1,105,860 1,162,691
Income Before Income Taxes $ 743,870 $ 438,519 $ 678,332
Return on average interest earning assets (pre-tax) 1.28% 0.77% 1.20%
Net interest margin 3.05% 2.84% 2.95%
Treasury and Corporate Other      
Segment Reporting Information [Line Items]      
Average interest earning assets $ 8,816,609 $ 7,287,340 $ 7,148,667
Interest income 356,127 282,751 251,961
Interest expense 223,422 219,796 186,422
Net Interest Income 132,705 62,955 65,539
(Credit) provision for credit losses 87 (558) 4,559
Net Interest Income After Provision for Credit Losses 132,618 63,513 60,980
Non-interest income 21,637 11,480 26,829
Salary and employee benefits expense 55,424 50,020 62,177
Net occupancy expense 15,481 12,761 12,377
Technology, furniture and equipment expense 16,662 15,617 26,331
FDIC insurance assessment (9,487) 8,757 50,297
Professional and legal fees 10,943 6,395 10,796
Other segment items 83,585 65,952 73,363
Total non-interest expense 172,608 159,502 235,341
Income Before Income Taxes $ (18,353) $ (84,509) $ (147,532)
Return on average interest earning assets (pre-tax) (0.21%) (1.16%) (2.06%)
Net interest margin 1.51% 0.86% 0.91%
Consumer Banking | Operating Segments      
Segment Reporting Information [Line Items]      
Average interest earning assets $ 10,675,089 $ 9,914,917 $ 9,620,508
Interest income 523,519 478,680 415,585
Interest expense 270,518 299,048 250,882
Net Interest Income 253,001 179,632 164,703
(Credit) provision for credit losses (630) 24,561 6,162
Net Interest Income After Provision for Credit Losses 253,631 155,071 158,541
Non-interest income 139,321 135,331 105,282
Salary and employee benefits expense 132,712 118,953 111,748
Net occupancy expense 19,109 18,003 19,313
Technology, furniture and equipment expense 26,770 25,681 25,661
FDIC insurance assessment 10,545 10,448 7,380
Professional and legal fees 14,712 11,254 13,016
Other segment items 54,172 58,282 48,650
Total non-interest expense 258,020 242,621 225,768
Income Before Income Taxes $ 134,932 $ 47,781 $ 38,055
Return on average interest earning assets (pre-tax) 1.26% 0.48% 0.40%
Net interest margin 2.37% 1.81% 1.71%
Commercial Banking | Operating Segments      
Segment Reporting Information [Line Items]      
Average interest earning assets $ 38,471,202 $ 40,115,669 $ 39,731,353
Interest income 2,352,838 2,596,066 2,471,345
Interest expense 974,900 1,209,945 1,036,109
Net Interest Income 1,377,938 1,386,121 1,435,236
(Credit) provision for credit losses 140,317 284,827 39,463
Net Interest Income After Provision for Credit Losses 1,237,621 1,101,294 1,395,773
Non-interest income 101,168 77,690 93,618
Salary and employee benefits expense 391,384 389,622 389,666
Net occupancy expense 67,704 71,360 69,780
Technology, furniture and equipment expense 80,444 93,811 98,716
FDIC insurance assessment 38,001 42,271 30,477
Professional and legal fees 61,092 52,666 56,755
Other segment items 72,873 54,007 56,188
Total non-interest expense 711,498 703,737 701,582
Income Before Income Taxes $ 627,291 $ 475,247 $ 787,809
Return on average interest earning assets (pre-tax) 1.63% 1.18% 1.98%
Net interest margin 3.59% 3.45% 3.61%