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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
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance $ 262,714 $ 241,114 $ 235,704 $ 256,421  
Provision for loan losses 15,931 1,111 50,413 (9,014)  
Loans charged off (10,593) (1,766) (22,309) (10,939)  
Recoveries of loans previously charged off 4,062 1,309 8,306 5,300  
Ending balance 272,114 241,768 272,114 241,768  
Provision Details [Abstract]          
Provision for credit losses 7,000 15,000 40,000 15,000  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance 59,940 42,250 60,919 32,977  
Provision for off-balance sheet credit risk (7,336) 14,060 (8,315) 23,333  
Ending balance 52,604 56,310 52,604 56,310  
Recorded investment [Abstract]          
Collectively measured for impairment, recorded investment 23,604,433   23,604,433   $ 22,435,353
Individually measured for impairment, recorded investment 119,585   119,585   121,797
Total 23,724,018   23,724,018   22,557,150
Related allowance [Abstract]          
Collectively measured for impairment, related allowance 270,468   270,468   230,134
Individually measured for impairment, related allowance 1,646   1,646   5,570
Total 272,114   272,114   235,704
Commercial [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance 143,269 137,562 131,586 162,056  
Provision for loan losses 1,158 3,158 12,908 (17,428)  
Loans charged off (6,769) (75) (9,578) (6,162)  
Recoveries of loans previously charged off 273 721 3,015 2,900  
Ending balance 137,931 141,366 137,931 141,366  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance 20,294 15,839 18,246 13,812  
Provision for off-balance sheet credit risk (2,179) 939 (131) 2,966  
Ending balance 18,115 16,778 18,115 16,778  
Recorded investment [Abstract]          
Collectively measured for impairment, recorded investment 14,649,141   14,649,141   14,152,202
Individually measured for impairment, recorded investment 70,698   70,698   60,297
Total 14,719,839   14,719,839   14,212,499
Related allowance [Abstract]          
Collectively measured for impairment, related allowance 136,285   136,285   127,566
Individually measured for impairment, related allowance 1,646   1,646   4,020
Total 137,931   137,931   131,586
Commercial real estate [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance 76,347 62,997 57,648 58,553  
Provision for loan losses 11,152 (4,415) 35,878 138  
Loans charged off (2,238) 0 (8,446) (269)  
Recoveries of loans previously charged off 3,167 7 3,348 167  
Ending balance 88,428 58,589 88,428 58,589  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance 37,681 24,670 40,490 17,442  
Provision for off-balance sheet credit risk (5,076) 12,826 (7,885) 20,054  
Ending balance 32,605 37,496 32,605 37,496  
Recorded investment [Abstract]          
Collectively measured for impairment, recorded investment 5,233,882   5,233,882   4,590,207
Individually measured for impairment, recorded investment 7,418   7,418   16,570
Total 5,241,300   5,241,300   4,606,777
Related allowance [Abstract]          
Collectively measured for impairment, related allowance 88,428   88,428   56,098
Individually measured for impairment, related allowance 0   0   1,550
Total 88,428   88,428   57,648
Loans to individuals [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance 43,098 40,555 46,470 35,812  
Provision for loan losses 3,621 2,368 1,627 8,276  
Loans charged off (1,586) (1,691) (4,285) (4,508)  
Recoveries of loans previously charged off 622 581 1,943 2,233  
Ending balance 45,755 41,813 45,755 41,813  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance 1,965 1,741 2,183 1,723  
Provision for off-balance sheet credit risk (81) 295 (299) 313  
Ending balance 1,884 $ 2,036 1,884 $ 2,036  
Recorded investment [Abstract]          
Collectively measured for impairment, recorded investment 3,721,410   3,721,410   3,692,944
Individually measured for impairment, recorded investment 41,469   41,469   44,930
Total 3,762,879   3,762,879   3,737,874
Related allowance [Abstract]          
Collectively measured for impairment, related allowance 45,755   45,755   46,470
Individually measured for impairment, related allowance 0   0   0
Total $ 45,755   $ 45,755   $ 46,470