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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 |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | $ 241,114 | $ 311,890 | $ 256,421 | $ 388,640 |
Provision for loan losses | 1,111 | (27,395) | (9,014) | (74,229) |
Loans charged off | (1,766) | (9,584) | (10,939) | (44,793) |
Recoveries of loans previously charged off | 1,309 | 1,769 | 5,300 | 7,062 |
Ending balance | 241,768 | 276,680 | 241,768 | 276,680 |
Provision Details [Abstract] |  |  |  |  |
Provision for credit losses | 15,000 | (23,000) | 15,000 | (83,000) |
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |  |
Beginning balance | 42,250 | 24,287 | 32,977 | 36,921 |
Provision for off-balance sheet credit risk | 14,060 | 4,952 | 23,333 | (7,682) |
Ending balance | 56,310 | 29,239 | 56,310 | 29,239 |
Recorded investment [Abstract] |  |  |  |  |
Collectively measured for impairment, recorded investment | 21,659,657 |  | 21,659,657 |  | $ 20,071,621
Individually measured for impairment, recorded investment | 130,800 |  | 130,800 |  | 134,059
Total | 21,790,457 |  | 21,790,457 |  | 20,205,680
Related allowance [Abstract] |  |  |  |  |
Collectively measured for impairment, related allowance | 224,720 |  | 224,720 |  | 250,079
Individually measured for impairment, related allowance | 17,048 |  | 17,048 |  | 6,342
Total | 241,768 |  | 241,768 |  | 256,421
Commercial [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 137,562 | 198,303 | 162,056 | 254,934 |
Provision for loan losses | 3,158 | (15,996) | (17,428) | (44,331) |
Loans charged off | (75) | (6,979) | (6,162) | (38,826) |
Recoveries of loans previously charged off | 721 | 832 | 2,900 | 4,383 |
Ending balance | 141,366 | 176,160 | 141,366 | 176,160 |
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |  |
Beginning balance | 15,839 | 10,094 | 13,812 | 14,422 |
Provision for off-balance sheet credit risk | 939 | 2,772 | 2,966 | (1,556) |
Ending balance | 16,778 | 12,866 | 16,778 | 12,866 |
Recorded investment [Abstract] |  |  |  |  |
Collectively measured for impairment, recorded investment | 13,532,016 |  | 13,532,016 |  | 12,432,361
Individually measured for impairment, recorded investment | 75,670 |  | 75,670 |  | 74,104
Total | 13,607,686 |  | 13,607,686 |  | 12,506,465
Related allowance [Abstract] |  |  |  |  |
Collectively measured for impairment, related allowance | 125,253 |  | 125,253 |  | 158,063
Individually measured for impairment, related allowance | 16,113 |  | 16,113 |  | 3,993
Total | 141,366 |  | 141,366 |  | 162,056
Commercial real estate [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 62,997 | 70,540 | 58,553 | 86,558 |
Provision for loan losses | (4,415) | (9,418) | 138 | (24,579) |
Loans charged off | 0 | (1,422) | (269) | (2,485) |
Recoveries of loans previously charged off | 7 | 228 | 167 | 434 |
Ending balance | 58,589 | 59,928 | 58,589 | 59,928 |
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |  |
Beginning balance | 24,670 | 12,348 | 17,442 | 20,571 |
Provision for off-balance sheet credit risk | 12,826 | 2,294 | 20,054 | (5,929) |
Ending balance | 37,496 | 14,642 | 37,496 | 14,642 |
Recorded investment [Abstract] |  |  |  |  |
Collectively measured for impairment, recorded investment | 4,465,940 |  | 4,465,940 |  | 3,817,063
Individually measured for impairment, recorded investment | 7,971 |  | 7,971 |  | 14,262
Total | 4,473,911 |  | 4,473,911 |  | 3,831,325
Related allowance [Abstract] |  |  |  |  |
Collectively measured for impairment, related allowance | 57,654 |  | 57,654 |  | 56,204
Individually measured for impairment, related allowance | 935 |  | 935 |  | 2,349
Total | 58,589 |  | 58,589 |  | 58,553
Paycheck Protection Program [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 0 | 0 | 0 | 0 |
Provision for loan losses | 0 | 0 | 0 | 0 |
Loans charged off | 0 | 0 | 0 | 0 |
Recoveries of loans previously charged off | 0 | 0 | 0 | 0 |
Ending balance | 0 | 0 | 0 | 0 |
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |  |
Beginning balance | 0 | 0 | 0 | 0 |
Provision for off-balance sheet credit risk | 0 | 0 | 0 | 0 |
Ending balance | 0 | 0 | 0 | 0 |
Recorded investment [Abstract] |  |  |  |  |
Collectively measured for impairment, recorded investment | 20,233 |  | 20,233 |  | 276,341
Individually measured for impairment, recorded investment | 0 |  | 0 |  | 0
Total | 20,233 |  | 20,233 |  | 276,341
Related allowance [Abstract] |  |  |  |  |
Collectively measured for impairment, related allowance | 0 |  | 0 |  | 0
Individually measured for impairment, related allowance | 0 |  | 0 |  | 0
Total | 0 |  | 0 |  | 0
Loans to individuals [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 40,555 | 43,047 | 35,812 | 47,148 |
Provision for loan losses | 2,368 | (1,981) | 8,276 | (5,319) |
Loans charged off | (1,691) | (1,183) | (4,508) | (3,482) |
Recoveries of loans previously charged off | 581 | 709 | 2,233 | 2,245 |
Ending balance | 41,813 | 40,592 | 41,813 | 40,592 |
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |  |
Beginning balance | 1,741 | 1,845 | 1,723 | 1,928 |
Provision for off-balance sheet credit risk | 295 | (114) | 313 | (197) |
Ending balance | 2,036 | $ 1,731 | 2,036 | $ 1,731 |
Recorded investment [Abstract] |  |  |  |  |
Collectively measured for impairment, recorded investment | 3,641,468 |  | 3,641,468 |  | 3,545,856
Individually measured for impairment, recorded investment | 47,159 |  | 47,159 |  | 45,693
Total | 3,688,627 |  | 3,688,627 |  | 3,591,549
Related allowance [Abstract] |  |  |  |  |
Collectively measured for impairment, related allowance | 41,813 |  | 41,813 |  | 35,812
Individually measured for impairment, related allowance | 0 |  | 0 |  | 0
Total | $ 41,813 |  | $ 41,813 |  | $ 35,812

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