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Loans and Allowances for Credit Losses, Activity in Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance $ 277,123 $ 235,704 $ 235,704
Provision for loan losses 9,960 14,525  
Loans charged off (7,060) (3,667)  
Recoveries of loans previously charged off 1,600 2,898  
Ending balance 281,623 249,460 277,123
Provision Details [Abstract]      
Provision for credit losses 8,000 16,000  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Beginning balance 48,977 60,919 60,919
Provision for off-balance sheet credit risk (1,658) 2,024  
Ending balance 47,319 62,943 48,977
Recorded investment [Abstract]      
Collectively measured for impairment, recorded investment 24,053,045   23,759,499
Individually measured for impairment, recorded investment 119,515   145,469
Total 24,172,560   23,904,968
Related allowance [Abstract]      
Collectively measured for impairment, related allowance 278,663   274,431
Individually measured for impairment, related allowance 2,960   2,692
Total 281,623   277,123
Commercial [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 141,232 131,586 131,586
Provision for loan losses 8,311 6,330  
Loans charged off (4,240) (12)  
Recoveries of loans previously charged off 964 1,994  
Ending balance 146,267 139,898 141,232
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Beginning balance 19,762 18,246 18,246
Provision for off-balance sheet credit risk (1,972) 2,362  
Ending balance 17,790 20,608 19,762
Recorded investment [Abstract]      
Collectively measured for impairment, recorded investment 15,058,247   14,693,638
Individually measured for impairment, recorded investment 74,620   110,131
Total 15,132,867   14,803,769
Related allowance [Abstract]      
Collectively measured for impairment, related allowance 143,307   138,540
Individually measured for impairment, related allowance 2,960   2,692
Total 146,267   141,232
Commercial real estate [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 94,718 57,648 57,648
Provision for loan losses 3,995 10,426  
Loans charged off (1,250) (2,208) (8,446)
Recoveries of loans previously charged off 16 137  
Ending balance 97,479 66,003 94,718
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Beginning balance 27,439 40,490 40,490
Provision for off-balance sheet credit risk 426 (279)  
Ending balance 27,865 40,211 27,439
Recorded investment [Abstract]      
Collectively measured for impairment, recorded investment 5,214,590   5,330,327
Individually measured for impairment, recorded investment 22,087   7,320
Total 5,236,677   5,337,647
Related allowance [Abstract]      
Collectively measured for impairment, related allowance 97,479   94,718
Individually measured for impairment, related allowance 0   0
Total 97,479   94,718
Loans to individuals [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 41,173 46,470 46,470
Provision for loan losses (2,346) (2,231)  
Loans charged off (1,570) (1,447)  
Recoveries of loans previously charged off 620 767  
Ending balance 37,877 43,559 41,173
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Beginning balance 1,776 2,183 2,183
Provision for off-balance sheet credit risk (112) (59)  
Ending balance 1,664 $ 2,124 1,776
Recorded investment [Abstract]      
Collectively measured for impairment, recorded investment 3,780,208   3,735,534
Individually measured for impairment, recorded investment 22,808   28,018
Total 3,803,016   3,763,552
Related allowance [Abstract]      
Collectively measured for impairment, related allowance 37,877   41,173
Individually measured for impairment, related allowance 0   0
Total $ 37,877   $ 41,173