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Loans and Allowances for Credit Losses, Activity in Allowance for Credit Losses (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | $ 235,704 | $ 256,421 |
Provision for loan losses | 14,525 | (3,967) |
Loans charged off | (3,667) | (7,805) |
Recoveries of loans previously charged off | 2,898 | 1,824 |
Ending balance | 249,460 | 246,473 |
Provision Details [Abstract] |  |  |
Provision for credit losses | 16,000 | 0 |
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |
Beginning balance | 60,919 | 32,977 |
Provision for off-balance sheet credit risk | 2,024 | 3,268 |
Ending balance | 62,943 | 36,245 |
Recorded investment [Abstract] |  |  |
Collectively measured for impairment, recorded investment | 22,629,758 |  | $ 22,435,353
Individually measured for impairment, recorded investment | 120,295 |  | 121,797
Total | 22,750,053 |  | 22,557,150
Related allowance [Abstract] |  |  |
Collectively measured for impairment, related allowance | 245,427 |  | 230,134
Individually measured for impairment, related allowance | 4,033 |  | 5,570
Total | 249,460 |  | 235,704
Commercial [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 131,586 | 162,056 |
Provision for loan losses | 6,330 | (5,118) |
Loans charged off | (12) | (6,081) |
Recoveries of loans previously charged off | 1,994 | 591 |
Ending balance | 139,898 | 151,448 |
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |
Beginning balance | 18,246 | 13,812 |
Provision for off-balance sheet credit risk | 2,362 | 154 |
Ending balance | 20,608 | 13,966 |
Recorded investment [Abstract] |  |  |
Collectively measured for impairment, recorded investment | 14,162,917 |  | 14,152,202
Individually measured for impairment, recorded investment | 54,432 |  | 60,297
Total | 14,217,349 |  | 14,212,499
Related allowance [Abstract] |  |  |
Collectively measured for impairment, related allowance | 137,415 |  | 127,566
Individually measured for impairment, related allowance | 2,483 |  | 4,020
Total | 139,898 |  | 131,586
Commercial real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 57,648 | 58,553 |
Provision for loan losses | 10,426 | 468 |
Loans charged off | (2,208) | (191) |
Recoveries of loans previously charged off | 137 | 144 |
Ending balance | 66,003 | 58,974 |
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |
Beginning balance | 40,490 | 17,442 |
Provision for off-balance sheet credit risk | (279) | 3,023 |
Ending balance | 40,211 | 20,465 |
Recorded investment [Abstract] |  |  |
Collectively measured for impairment, recorded investment | 4,793,648 |  | 4,590,207
Individually measured for impairment, recorded investment | 21,668 |  | 16,570
Total | 4,815,316 |  | 4,606,777
Related allowance [Abstract] |  |  |
Collectively measured for impairment, related allowance | 64,453 |  | 56,098
Individually measured for impairment, related allowance | 1,550 |  | 1,550
Total | 66,003 |  | 57,648
Loans to individuals [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 46,470 | 35,812 |
Provision for loan losses | (2,231) | 683 |
Loans charged off | (1,447) | (1,533) |
Recoveries of loans previously charged off | 767 | 1,089 |
Ending balance | 43,559 | 36,051 |
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |
Beginning balance | 2,183 | 1,723 |
Provision for off-balance sheet credit risk | (59) | 91 |
Ending balance | 2,124 | $ 1,814 |
Recorded investment [Abstract] |  |  |
Collectively measured for impairment, recorded investment | 3,673,193 |  | 3,692,944
Individually measured for impairment, recorded investment | 44,195 |  | 44,930
Total | 3,717,388 |  | 3,737,874
Related allowance [Abstract] |  |  |
Collectively measured for impairment, related allowance | 43,559 |  | 46,470
Individually measured for impairment, related allowance | 0 |  | 0
Total | $ 43,559 |  | $ 46,470

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