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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance $ 287,826 $ 262,714 $ 277,123 $ 235,704 $ 235,704
Provision for loan losses (3,424) 15,931 19,684 50,413  
Loans charged off (2,496) (10,593) (17,496) (22,309)  
Recoveries of loans previously charged off 2,550 4,062 5,145 8,306  
Ending balance 284,456 272,114 284,456 272,114 277,123
Provision Details [Abstract]          
Provision for credit losses 2,000 7,000 18,000 40,000  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance 42,336 59,940 48,977 60,919 60,919
Provision for off-balance sheet credit risk 5,430 (7,336) (1,211) (8,315)  
Ending balance 47,766 52,604 47,766 52,604 48,977
Recorded investment [Abstract]          
Collectively measured for impairment, recorded investment 23,900,746   23,900,746   23,759,499
Individually measured for impairment, recorded investment 84,315   84,315   145,469
Total 23,985,061   23,985,061   23,904,968
Related allowance [Abstract]          
Collectively measured for impairment, related allowance 281,523   281,523   274,431
Individually measured for impairment, related allowance 2,933   2,933   2,692
Total 284,456   284,456   277,123
Commercial [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance 150,737 143,269 141,232 131,586 131,586
Provision for loan losses 918 1,158 19,670 12,908  
Loans charged off (856) (6,769) (11,487) (9,578)  
Recoveries of loans previously charged off 1,562 273 2,946 3,015  
Ending balance 152,361 137,931 152,361 137,931 141,232
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance 17,316 20,294 19,762 18,246 18,246
Provision for off-balance sheet credit risk 357 (2,179) (2,089) (131)  
Ending balance 17,673 18,115 17,673 18,115 19,762
Recorded investment [Abstract]          
Collectively measured for impairment, recorded investment 14,826,250   14,826,250   14,693,638
Individually measured for impairment, recorded investment 51,672   51,672   110,131
Total 14,877,922   14,877,922   14,803,769
Related allowance [Abstract]          
Collectively measured for impairment, related allowance 149,428   149,428   138,540
Individually measured for impairment, related allowance 2,933   2,933   2,692
Total 152,361   152,361   141,232
Commercial real estate [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance 96,256 76,347 94,718 57,648 57,648
Provision for loan losses (4,944) 11,152 (1,991) 35,878  
Loans charged off 0 (2,238) (1,455) (8,446) (8,446)
Recoveries of loans previously charged off 226 3,167 266 3,348  
Ending balance 91,538 88,428 91,538 88,428 94,718
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance 23,314 37,681 27,439 40,490 40,490
Provision for off-balance sheet credit risk 5,058 (5,076) 933 (7,885)  
Ending balance 28,372 32,605 28,372 32,605 27,439
Recorded investment [Abstract]          
Collectively measured for impairment, recorded investment 5,176,291   5,176,291   5,330,327
Individually measured for impairment, recorded investment 12,364   12,364   7,320
Total 5,188,655   5,188,655   5,337,647
Related allowance [Abstract]          
Collectively measured for impairment, related allowance 91,538   91,538   94,718
Individually measured for impairment, related allowance 0   0   0
Total 91,538   91,538   94,718
Loans to individuals [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance 40,833 43,098 41,173 46,470 46,470
Provision for loan losses 602 3,621 2,005 1,627  
Loans charged off (1,640) (1,586) (4,554) (4,285)  
Recoveries of loans previously charged off 762 622 1,933 1,943  
Ending balance 40,557 45,755 40,557 45,755 41,173
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance 1,706 1,965 1,776 2,183 2,183
Provision for off-balance sheet credit risk 15 (81) (55) (299)  
Ending balance 1,721 $ 1,884 1,721 $ 1,884 1,776
Recorded investment [Abstract]          
Collectively measured for impairment, recorded investment 3,898,205   3,898,205   3,735,534
Individually measured for impairment, recorded investment 20,279   20,279   28,018
Total 3,918,484   3,918,484   3,763,552
Related allowance [Abstract]          
Collectively measured for impairment, related allowance 40,557   40,557   41,173
Individually measured for impairment, related allowance 0   0   0
Total $ 40,557   $ 40,557   $ 41,173