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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, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | $ 278,594 | $ 281,623 | $ 280,035 | $ 277,123 | $ 277,123
Provision for loan losses | (984) | 13,148 | (1,320) | 23,108 |
Loans charged off | (1,313) | (7,940) | (3,604) | (15,000) |
Recoveries of loans previously charged off | 752 | 995 | 1,938 | 2,595 |
Ending balance | 277,049 | 287,826 | 277,049 | 287,826 | 280,035
Provision Details [Abstract] |  |  |  |  |
Provision for credit losses | 0 | 8,000 | 0 | 16,000 |
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |  |
Beginning balance | 52,088 | 47,319 | 51,640 | 48,977 | 48,977
Provision for off-balance sheet credit risk | 904 | (4,983) | 1,352 | (6,641) |
Ending balance | 52,992 | 42,336 | 52,992 | 42,336 | 51,640
Recorded investment [Abstract] |  |  |  |  |
Collectively measured for impairment, recorded investment | 24,212,884 |  | 24,212,884 |  | 24,067,999
Individually measured for impairment, recorded investment | 79,327 |  | 79,327 |  | 46,725
Loans | 24,292,211 |  | 24,292,211 |  | 24,114,724
Related allowance [Abstract] |  |  |  |  |
Collectively measured for impairment, related allowance | 273,325 |  | 273,325 |  | 279,759
Individually measured for impairment, related allowance | 3,724 |  | 3,724 |  | 276
Total | 277,049 | 287,826 | 277,049 | 287,826 | 280,035
Commercial [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 143,505 | 146,267 | 145,153 | 141,232 | 141,232
Provision for loan losses | 744 | 10,441 | (111) | 18,752 |
Loans charged off | (35) | (6,391) | (1,120) | (10,631) |
Recoveries of loans previously charged off | 184 | 420 | 476 | 1,384 |
Ending balance | 144,398 | 150,737 | 144,398 | 150,737 | 145,153
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |  |
Beginning balance | 16,167 | 17,790 | 18,046 | 19,762 | 19,762
Provision for off-balance sheet credit risk | 828 | (474) | (1,051) | (2,446) |
Ending balance | 16,995 | 17,316 | 16,995 | 17,316 | 18,046
Recorded investment [Abstract] |  |  |  |  |
Collectively measured for impairment, recorded investment | 14,344,025 |  | 14,344,025 |  | 15,015,489
Individually measured for impairment, recorded investment | 40,157 |  | 40,157 |  | 14,647
Loans | 14,384,182 |  | 14,384,182 |  | 15,030,136
Related allowance [Abstract] |  |  |  |  |
Collectively measured for impairment, related allowance | 140,674 |  | 140,674 |  | 144,877
Individually measured for impairment, related allowance | 3,724 |  | 3,724 |  | 276
Total | 144,398 | 150,737 | 144,398 | 150,737 | 145,153
Commercial real estate [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 93,724 | 97,479 | 91,072 | 94,718 | 94,718
Provision for loan losses | (8,501) | (1,042) | (6,034) | 2,953 |
Loans charged off | (126) | (205) | (126) | (1,455) | (1,455)
Recoveries of loans previously charged off | 10 | 24 | 195 | 40 |
Ending balance | 85,107 | 96,256 | 85,107 | 96,256 | 91,072
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |  |
Beginning balance | 33,461 | 27,865 | 31,959 | 27,439 | 27,439
Provision for off-balance sheet credit risk | 97 | (4,551) | 1,599 | (4,125) |
Ending balance | 33,558 | 23,314 | 33,558 | 23,314 | 31,959
Recorded investment [Abstract] |  |  |  |  |
Collectively measured for impairment, recorded investment | 5,514,516 |  | 5,514,516 |  | 5,048,547
Individually measured for impairment, recorded investment | 6,925 |  | 6,925 |  | 9,905
Loans | 5,521,441 |  | 5,521,441 |  | 5,058,452
Related allowance [Abstract] |  |  |  |  |
Collectively measured for impairment, related allowance | 85,107 |  | 85,107 |  | 91,072
Individually measured for impairment, related allowance | 0 |  | 0 |  | 0
Total | 85,107 | 96,256 | 85,107 | 96,256 | 91,072
Loans to individuals [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 41,365 | 37,877 | 43,810 | 41,173 | 41,173
Provision for loan losses | 6,773 | 3,749 | 4,825 | 1,403 |
Loans charged off | (1,152) | (1,344) | (2,358) | (2,914) |
Recoveries of loans previously charged off | 558 | 551 | 1,267 | 1,171 |
Ending balance | 47,544 | 40,833 | 47,544 | 40,833 | 43,810
Off-Balance Sheet, Credit Loss, Liability [Roll Forward] |  |  |  |  |
Beginning balance | 2,460 | 1,664 | 1,635 | 1,776 | 1,776
Provision for off-balance sheet credit risk | (21) | 42 | 804 | (70) |
Ending balance | 2,439 | 1,706 | 2,439 | 1,706 | 1,635
Recorded investment [Abstract] |  |  |  |  |
Collectively measured for impairment, recorded investment | 4,354,343 |  | 4,354,343 |  | 4,003,963
Individually measured for impairment, recorded investment | 32,245 |  | 32,245 |  | 22,173
Loans | 4,386,588 |  | 4,386,588 |  | 4,026,136
Related allowance [Abstract] |  |  |  |  |
Collectively measured for impairment, related allowance | 47,544 |  | 47,544 |  | 43,810
Individually measured for impairment, related allowance | 0 |  | 0 |  | 0
Total | $ 47,544 | $ 40,833 | $ 47,544 | $ 40,833 | $ 43,810

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