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Loans and Allowances for Credit Losses, Activity in Allowance for Credit Losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | $ 277,049 | $ 287,826 | $ 280,035 | $ 277,123 | $ 277,123
Provision for loan losses | 4,270 | (3,424) | 2,950 | 19,684 |
Loans charged off | (4,348) | (2,496) | (7,952) | (17,496) |
Recoveries of loans previously charged off | 721 | 2,550 | 2,659 | 5,145 |
Ending balance | 277,692 | 284,456 | 277,692 | 284,456 | 280,035
Provision Details [Abstract] |  |  |  |  |
Provision for credit losses | 2,000 | 2,000 | 2,000 | 18,000 |
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |  |
Beginning balance | 52,992 | 42,336 | 51,640 | 48,977 | 48,977
Provision for off-balance sheet credit risk | (2,208) | 5,430 | (856) | (1,211) |
Ending balance | 50,784 | 47,766 | 50,784 | 47,766 | 51,640
Recorded investment [Abstract] |  |  |  |  |
Collectively measured for impairment, recorded investment | 24,792,800 |  | 24,792,800 |  | 24,067,999
Individually measured for impairment, recorded investment | 72,394 |  | 72,394 |  | 46,725
Total | 24,865,194 |  | 24,865,194 |  | 24,114,724
Related allowance [Abstract] |  |  |  |  |
Collectively measured for impairment, related allowance | 273,347 |  | 273,347 |  | 279,759
Individually measured for impairment, related allowance | 4,345 |  | 4,345 |  | 276
Total | 277,692 | 284,456 | 277,692 | 284,456 | 280,035
Commercial [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 144,398 | 150,737 | 145,153 | 141,232 | 141,232
Provision for loan losses | (4,262) | 918 | (4,373) | 19,670 |
Loans charged off | (3,157) | (856) | (4,277) | (11,487) |
Recoveries of loans previously charged off | 79 | 1,562 | 555 | 2,946 |
Ending balance | 137,058 | 152,361 | 137,058 | 152,361 | 145,153
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |  |
Beginning balance | 16,995 | 17,316 | 18,046 | 19,762 | 19,762
Provision for off-balance sheet credit risk | 1,839 | 357 | 788 | (2,089) |
Ending balance | 18,834 | 17,673 | 18,834 | 17,673 | 18,046
Recorded investment [Abstract] |  |  |  |  |
Collectively measured for impairment, recorded investment | 14,480,670 |  | 14,480,670 |  | 15,015,489
Individually measured for impairment, recorded investment | 32,270 |  | 32,270 |  | 14,647
Total | 14,512,940 |  | 14,512,940 |  | 15,030,136
Related allowance [Abstract] |  |  |  |  |
Collectively measured for impairment, related allowance | 134,908 |  | 134,908 |  | 144,877
Individually measured for impairment, related allowance | 2,150 |  | 2,150 |  | 276
Total | 137,058 | 152,361 | 137,058 | 152,361 | 145,153
Commercial real estate [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 85,107 | 96,256 | 91,072 | 94,718 | 94,718
Provision for loan losses | 4,055 | (4,944) | (1,979) | (1,991) |
Loans charged off | 0 | 0 | (126) | (1,455) | (1,455)
Recoveries of loans previously charged off | 81 | 226 | 276 | 266 |
Ending balance | 89,243 | 91,538 | 89,243 | 91,538 | 91,072
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |  |
Beginning balance | 33,558 | 23,314 | 31,959 | 27,439 | 27,439
Provision for off-balance sheet credit risk | (3,081) | 5,058 | (1,482) | 933 |
Ending balance | 30,477 | 28,372 | 30,477 | 28,372 | 31,959
Recorded investment [Abstract] |  |  |  |  |
Collectively measured for impairment, recorded investment | 5,745,798 |  | 5,745,798 |  | 5,048,547
Individually measured for impairment, recorded investment | 6,809 |  | 6,809 |  | 9,905
Total | 5,752,607 |  | 5,752,607 |  | 5,058,452
Related allowance [Abstract] |  |  |  |  |
Collectively measured for impairment, related allowance | 87,048 |  | 87,048 |  | 91,072
Individually measured for impairment, related allowance | 2,195 |  | 2,195 |  | 0
Total | 89,243 | 91,538 | 89,243 | 91,538 | 91,072
Loans to individuals [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 47,544 | 40,833 | 43,810 | 41,173 | 41,173
Provision for loan losses | 4,477 | 602 | 9,302 | 2,005 |
Loans charged off | (1,191) | (1,640) | (3,549) | (4,554) |
Recoveries of loans previously charged off | 561 | 762 | 1,828 | 1,933 |
Ending balance | 51,391 | 40,557 | 51,391 | 40,557 | 43,810
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |  |
Beginning balance | 2,439 | 1,706 | 1,635 | 1,776 | 1,776
Provision for off-balance sheet credit risk | (966) | 15 | (162) | (55) |
Ending balance | 1,473 | 1,721 | 1,473 | 1,721 | 1,635
Recorded investment [Abstract] |  |  |  |  |
Collectively measured for impairment, recorded investment | 4,566,332 |  | 4,566,332 |  | 4,003,963
Individually measured for impairment, recorded investment | 33,315 |  | 33,315 |  | 22,173
Total | 4,599,647 |  | 4,599,647 |  | 4,026,136
Related allowance [Abstract] |  |  |  |  |
Collectively measured for impairment, related allowance | 51,391 |  | 51,391 |  | 43,810
Individually measured for impairment, related allowance | 0 |  | 0 |  | 0
Total | $ 51,391 | $ 40,557 | $ 51,391 | $ 40,557 | $ 43,810

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