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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 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance $ 277,049 $ 287,826 $ 280,035 $ 277,123 $ 277,123
Provision for loan losses 4,270 (3,424) 2,950 19,684  
Loans charged off (4,348) (2,496) (7,952) (17,496)  
Recoveries of loans previously charged off 721 2,550 2,659 5,145  
Ending balance 277,692 284,456 277,692 284,456 280,035
Provision Details [Abstract]          
Provision for credit losses 2,000 2,000 2,000 18,000  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance 52,992 42,336 51,640 48,977 48,977
Provision for off-balance sheet credit risk (2,208) 5,430 (856) (1,211)  
Ending balance 50,784 47,766 50,784 47,766 51,640
Recorded investment [Abstract]          
Collectively measured for impairment, recorded investment 24,792,800   24,792,800   24,067,999
Individually measured for impairment, recorded investment 72,394   72,394   46,725
Total 24,865,194   24,865,194   24,114,724
Related allowance [Abstract]          
Collectively measured for impairment, related allowance 273,347   273,347   279,759
Individually measured for impairment, related allowance 4,345   4,345   276
Total 277,692 284,456 277,692 284,456 280,035
Commercial [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance 144,398 150,737 145,153 141,232 141,232
Provision for loan losses (4,262) 918 (4,373) 19,670  
Loans charged off (3,157) (856) (4,277) (11,487)  
Recoveries of loans previously charged off 79 1,562 555 2,946  
Ending balance 137,058 152,361 137,058 152,361 145,153
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance 16,995 17,316 18,046 19,762 19,762
Provision for off-balance sheet credit risk 1,839 357 788 (2,089)  
Ending balance 18,834 17,673 18,834 17,673 18,046
Recorded investment [Abstract]          
Collectively measured for impairment, recorded investment 14,480,670   14,480,670   15,015,489
Individually measured for impairment, recorded investment 32,270   32,270   14,647
Total 14,512,940   14,512,940   15,030,136
Related allowance [Abstract]          
Collectively measured for impairment, related allowance 134,908   134,908   144,877
Individually measured for impairment, related allowance 2,150   2,150   276
Total 137,058 152,361 137,058 152,361 145,153
Commercial real estate [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance 85,107 96,256 91,072 94,718 94,718
Provision for loan losses 4,055 (4,944) (1,979) (1,991)  
Loans charged off 0 0 (126) (1,455) (1,455)
Recoveries of loans previously charged off 81 226 276 266  
Ending balance 89,243 91,538 89,243 91,538 91,072
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance 33,558 23,314 31,959 27,439 27,439
Provision for off-balance sheet credit risk (3,081) 5,058 (1,482) 933  
Ending balance 30,477 28,372 30,477 28,372 31,959
Recorded investment [Abstract]          
Collectively measured for impairment, recorded investment 5,745,798   5,745,798   5,048,547
Individually measured for impairment, recorded investment 6,809   6,809   9,905
Total 5,752,607   5,752,607   5,058,452
Related allowance [Abstract]          
Collectively measured for impairment, related allowance 87,048   87,048   91,072
Individually measured for impairment, related allowance 2,195   2,195   0
Total 89,243 91,538 89,243 91,538 91,072
Loans to individuals [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance 47,544 40,833 43,810 41,173 41,173
Provision for loan losses 4,477 602 9,302 2,005  
Loans charged off (1,191) (1,640) (3,549) (4,554)  
Recoveries of loans previously charged off 561 762 1,828 1,933  
Ending balance 51,391 40,557 51,391 40,557 43,810
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance 2,439 1,706 1,635 1,776 1,776
Provision for off-balance sheet credit risk (966) 15 (162) (55)  
Ending balance 1,473 1,721 1,473 1,721 1,635
Recorded investment [Abstract]          
Collectively measured for impairment, recorded investment 4,566,332   4,566,332   4,003,963
Individually measured for impairment, recorded investment 33,315   33,315   22,173
Total 4,599,647   4,599,647   4,026,136
Related allowance [Abstract]          
Collectively measured for impairment, related allowance 51,391   51,391   43,810
Individually measured for impairment, related allowance 0   0   0
Total $ 51,391 $ 40,557 $ 51,391 $ 40,557 $ 43,810