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Loans and Allowances for Credit Losses, Activity in Allowance for Credit Losses (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Allowance for loan losses [Roll Forward] |  |  |
Beginning balance | $ 235,704 | $ 256,421 | $ 388,640
Provision for loan losses | 59,518 | 428 | (95,202)
Loans charged off | (27,316) | (28,746) | (51,351)
Recoveries of loans previously charged off | 9,217 | 7,601 | 14,334
Ending balance | 277,123 | 235,704 | 256,421
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |
Beginning Balance | 60,919 | 32,977 | 36,921
Provision for off-balance sheet credit risk | (11,942) | 27,942 | (3,944)
Ending Balance | 48,977 | 60,919 | 32,977
Provision Details [Abstract] |  |  |
Total provision for credit losses | 46,000 | 30,000 | (100,000)
Recorded investment [Abstract] |  |  |
Collectively measured for impairment, recorded investment | 23,759,499 | 22,435,353 |
Individually measured for impairment, recorded investment | 145,469 | 121,797 |
Total | 23,904,968 | 22,557,150 |
Related allowance [Abstract] |  |  |
Collectively measured for impairment, related allowance | 274,431 | 230,134 |
Individually measured for impairment, related allowance | 2,692 | 5,570 |
Total | 277,123 | 235,704 |
Commercial [Member] |  |  |
Allowance for loan losses [Roll Forward] |  |  |
Beginning balance | 131,586 | 162,056 | 254,934
Provision for loan losses | 19,308 | (12,782) | (59,326)
Loans charged off | (12,898) | (22,382) | (43,956)
Recoveries of loans previously charged off | 3,236 | 4,694 | 10,404
Ending balance | 141,232 | 131,586 | 162,056
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |
Beginning Balance | 18,246 | 13,812 | 14,422
Provision for off-balance sheet credit risk | 1,516 | 4,434 | (610)
Ending Balance | 19,762 | 18,246 | 13,812
Recorded investment [Abstract] |  |  |
Collectively measured for impairment, recorded investment | 14,693,638 | 14,152,202 |
Individually measured for impairment, recorded investment | 110,131 | 60,297 |
Total | 14,803,769 | 14,212,499 |
Related allowance [Abstract] |  |  |
Collectively measured for impairment, related allowance | 138,540 | 127,566 |
Individually measured for impairment, related allowance | 2,692 | 4,020 |
Total | 141,232 | 131,586 |
Commercial real estate [Member] |  |  |
Allowance for loan losses [Roll Forward] |  |  |
Beginning balance | 57,648 | 58,553 | 86,558
Provision for loan losses | 42,151 | (813) | (26,522)
Loans charged off | (8,446) | (269) | (2,485)
Recoveries of loans previously charged off | 3,365 | 177 | 1,002
Ending balance | 94,718 | 57,648 | 58,553
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |
Beginning Balance | 40,490 | 17,442 | 20,571
Provision for off-balance sheet credit risk | (13,051) | 23,048 | (3,129)
Ending Balance | 27,439 | 40,490 | 17,442
Recorded investment [Abstract] |  |  |
Collectively measured for impairment, recorded investment | 5,330,327 | 4,590,207 |
Individually measured for impairment, recorded investment | 7,320 | 16,570 |
Total | 5,337,647 | 4,606,777 |
Related allowance [Abstract] |  |  |
Collectively measured for impairment, related allowance | 94,718 | 56,098 |
Individually measured for impairment, related allowance | 0 | 1,550 |
Total | 94,718 | 57,648 |
Loans to individuals [Member] |  |  |
Allowance for loan losses [Roll Forward] |  |  |
Beginning balance | 46,470 | 35,812 | 47,148
Provision for loan losses | (1,941) | 14,023 | (9,354)
Loans charged off | (5,972) | (6,095) | (4,910)
Recoveries of loans previously charged off | 2,616 | 2,730 | 2,928
Ending balance | 41,173 | 46,470 | 35,812
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |
Beginning Balance | 2,183 | 1,723 | 1,928
Provision for off-balance sheet credit risk | (407) | 460 | (205)
Ending Balance | 1,776 | 2,183 | $ 1,723
Recorded investment [Abstract] |  |  |
Collectively measured for impairment, recorded investment | 3,735,534 | 3,692,944 |
Individually measured for impairment, recorded investment | 28,018 | 44,930 |
Total | 3,763,552 | 3,737,874 |
Related allowance [Abstract] |  |  |
Collectively measured for impairment, related allowance | 41,173 | 46,470 |
Individually measured for impairment, related allowance | 0 | 0 |
Total | $ 41,173 | $ 46,470 |

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