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Loans and Allowances for Credit Losses, Activity in Allowance for Credit Losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | $ 281,623 | $ 249,460 | $ 277,123 | $ 235,704 | $ 235,704
Provision for loan losses | 13,148 | 19,957 | 23,108 | 34,482 |
Loans charged off | (7,940) | (8,049) | (15,000) | (11,716) |
Recoveries of loans previously charged off | 995 | 1,346 | 2,595 | 4,244 |
Ending balance | 287,826 | 262,714 | 287,826 | 262,714 | 277,123
Provision Details [Abstract] |  |  |  |  |
Provision for credit losses | 8,000 | 17,000 | 16,000 | 33,000 |
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |  |
Beginning balance | 47,319 | 62,943 | 48,977 | 60,919 | 60,919
Provision for off-balance sheet credit risk | (4,983) | (3,003) | (6,641) | (979) |
Ending balance | 42,336 | 59,940 | 42,336 | 59,940 | 48,977
Recorded investment [Abstract] |  |  |  |  |
Collectively measured for impairment, recorded investment | 24,462,898 |  | 24,462,898 |  | 23,759,499
Individually measured for impairment, recorded investment | 90,683 |  | 90,683 |  | 145,469
Total | 24,553,581 |  | 24,553,581 |  | 23,904,968
Related allowance [Abstract] |  |  |  |  |
Collectively measured for impairment, related allowance | 285,612 |  | 285,612 |  | 274,431
Individually measured for impairment, related allowance | 2,214 |  | 2,214 |  | 2,692
Total | 287,826 |  | 287,826 |  | 277,123
Commercial [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 146,267 | 139,898 | 141,232 | 131,586 | 131,586
Provision for loan losses | 10,441 | 5,420 | 18,752 | 11,750 |
Loans charged off | (6,391) | (2,797) | (10,631) | (2,809) |
Recoveries of loans previously charged off | 420 | 748 | 1,384 | 2,742 |
Ending balance | 150,737 | 143,269 | 150,737 | 143,269 | 141,232
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |  |
Beginning balance | 17,790 | 20,608 | 19,762 | 18,246 | 18,246
Provision for off-balance sheet credit risk | (474) | (314) | (2,446) | 2,048 |
Ending balance | 17,316 | 20,294 | 17,316 | 20,294 | 19,762
Recorded investment [Abstract] |  |  |  |  |
Collectively measured for impairment, recorded investment | 15,564,975 |  | 15,564,975 |  | 14,693,638
Individually measured for impairment, recorded investment | 58,434 |  | 58,434 |  | 110,131
Total | 15,623,409 |  | 15,623,409 |  | 14,803,769
Related allowance [Abstract] |  |  |  |  |
Collectively measured for impairment, related allowance | 148,523 |  | 148,523 |  | 138,540
Individually measured for impairment, related allowance | 2,214 |  | 2,214 |  | 2,692
Total | 150,737 |  | 150,737 |  | 141,232
Commercial real estate [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 97,479 | 66,003 | 94,718 | 57,648 | 57,648
Provision for loan losses | (1,042) | 14,300 | 2,953 | 24,726 |
Loans charged off | (205) | (4,000) | (1,455) | (6,208) | (8,446)
Recoveries of loans previously charged off | 24 | 44 | 40 | 181 |
Ending balance | 96,256 | 76,347 | 96,256 | 76,347 | 94,718
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |  |
Beginning balance | 27,865 | 40,211 | 27,439 | 40,490 | 40,490
Provision for off-balance sheet credit risk | (4,551) | (2,530) | (4,125) | (2,809) |
Ending balance | 23,314 | 37,681 | 23,314 | 37,681 | 27,439
Recorded investment [Abstract] |  |  |  |  |
Collectively measured for impairment, recorded investment | 5,070,692 |  | 5,070,692 |  | 5,330,327
Individually measured for impairment, recorded investment | 12,883 |  | 12,883 |  | 7,320
Total | 5,083,575 |  | 5,083,575 |  | 5,337,647
Related allowance [Abstract] |  |  |  |  |
Collectively measured for impairment, related allowance | 96,256 |  | 96,256 |  | 94,718
Individually measured for impairment, related allowance | 0 |  | 0 |  | 0
Total | 96,256 |  | 96,256 |  | 94,718
Loans to individuals [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 37,877 | 43,559 | 41,173 | 46,470 | 46,470
Provision for loan losses | 3,749 | 237 | 1,403 | (1,994) |
Loans charged off | (1,344) | (1,252) | (2,914) | (2,699) |
Recoveries of loans previously charged off | 551 | 554 | 1,171 | 1,321 |
Ending balance | 40,833 | 43,098 | 40,833 | 43,098 | 41,173
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |  |
Beginning balance | 1,664 | 2,124 | 1,776 | 2,183 | 2,183
Provision for off-balance sheet credit risk | 42 | (159) | (70) | (218) |
Ending balance | 1,706 | $ 1,965 | 1,706 | $ 1,965 | 1,776
Recorded investment [Abstract] |  |  |  |  |
Collectively measured for impairment, recorded investment | 3,827,231 |  | 3,827,231 |  | 3,735,534
Individually measured for impairment, recorded investment | 19,366 |  | 19,366 |  | 28,018
Total | 3,846,597 |  | 3,846,597 |  | 3,763,552
Related allowance [Abstract] |  |  |  |  |
Collectively measured for impairment, related allowance | 40,833 |  | 40,833 |  | 41,173
Individually measured for impairment, related allowance | 0 |  | 0 |  | 0
Total | $ 40,833 |  | $ 40,833 |  | $ 41,173

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