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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance $ 311,890     $ 236,568  
Provision for loan losses (27,395) $ 6,609 $ (74,229) 236,938  
Loans charged off (9,584) (26,661) (44,793) (61,148)  
Recoveries of loans previously charged off 1,769 4,232 7,062 7,419  
Ending balance 276,680 419,777 276,680 419,777  
Provision Details [Abstract]          
Change in provision due to changes in reasonable and supportable forecasts, primarily due to COVID-19 pandemic (12,300)        
Other changes to provision (10,100)        
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance 24,287 32,919 36,921 25,137  
Provision for off-balance sheet credit risk 4,952 (4,950) (7,682) 2,832  
Ending balance 29,239 27,969 29,239 27,969  
Recorded investment [Abstract]          
Collectively measured for impairment, recorded investment 20,205,989   20,205,989   $ 22,772,827
Individually measured for impairment, recorded investment 141,947   141,947   234,693
Total 20,347,936   20,347,936   23,007,520
Related allowance [Abstract]          
Collectively measured for impairment, related allowance 266,496   266,496   366,199
Individually measured for impairment, related allowance 10,184   10,184   22,441
Total 276,680   276,680   388,640
Commercial [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance 198,303     151,868  
Provision for loan losses (15,996) 2,108 (44,331) 190,984  
Loans charged off (6,979) (25,319) (38,826) (56,421)  
Recoveries of loans previously charged off 832 3,066 4,383 3,846  
Ending balance 176,160 290,277 176,160 290,277  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance 10,094 14,582 14,422 11,578  
Provision for off-balance sheet credit risk 2,772 (2,618) (1,556) 386  
Ending balance 12,866 11,964 12,866 11,964  
Recorded investment [Abstract]          
Collectively measured for impairment, recorded investment 12,094,466   12,094,466   12,910,376
Individually measured for impairment, recorded investment 80,674   80,674   167,159
Total 12,175,140   12,175,140   13,077,535
Related allowance [Abstract]          
Collectively measured for impairment, related allowance 168,325   168,325   235,882
Individually measured for impairment, related allowance 7,835   7,835   19,052
Total 176,160   176,160   254,934
Commercial real estate [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance 70,540     47,185  
Provision for loan losses (9,418) 3,118 (24,579) 25,454  
Loans charged off (1,422) (413) (2,485) (1,300)  
Recoveries of loans previously charged off 228 114 434 236  
Ending balance 59,928 71,575 59,928 71,575  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance 12,348 16,419 20,571 11,767  
Provision for off-balance sheet credit risk 2,294 (2,426) (5,929) 2,226  
Ending balance 14,642 13,993 14,642 13,993  
Recorded investment [Abstract]          
Collectively measured for impairment, recorded investment 4,095,669   4,095,669   4,671,292
Individually measured for impairment, recorded investment 21,223   21,223   27,246
Total 4,116,892   4,116,892   4,698,538
Related allowance [Abstract]          
Collectively measured for impairment, related allowance 57,579   57,579   83,169
Individually measured for impairment, related allowance 2,349   2,349   3,389
Total 59,928   59,928   86,558
Paycheck Protection Program [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance 0     0  
Provision for loan losses 0 0 0 0  
Loans charged off 0 0 0 0  
Recoveries of loans previously charged off 0 0 0 0  
Ending balance 0 0 0 0  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance 0 0 0 0  
Provision for off-balance sheet credit risk 0 0 0 0  
Ending balance 0 0 0 0  
Recorded investment [Abstract]          
Collectively measured for impairment, recorded investment 536,052   536,052   1,682,310
Individually measured for impairment, recorded investment 0   0   0
Total 536,052   536,052   1,682,310
Related allowance [Abstract]          
Collectively measured for impairment, related allowance 0   0   0
Individually measured for impairment, related allowance 0   0   0
Total 0   0   0
Loans to individuals [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance 43,047     37,515  
Provision for loan losses (1,981) 1,383 (5,319) 20,500  
Loans charged off (1,183) (929) (3,482) (3,427)  
Recoveries of loans previously charged off 709 1,052 2,245 3,337  
Ending balance 40,592 57,925 40,592 57,925  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance 1,845 1,918 1,928 1,792  
Provision for off-balance sheet credit risk (114) 94 (197) 220  
Ending balance 1,731 2,012 1,731 2,012  
Recorded investment [Abstract]          
Collectively measured for impairment, recorded investment 3,479,802   3,479,802   3,508,849
Individually measured for impairment, recorded investment 40,050   40,050   40,288
Total 3,519,852   3,519,852   3,549,137
Related allowance [Abstract]          
Collectively measured for impairment, related allowance 40,592   40,592   47,148
Individually measured for impairment, related allowance 0   0   0
Total 40,592   40,592   $ 47,148
Nonspecific Allowance [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance 0     0  
Provision for loan losses 0 0 0 0  
Loans charged off 0 0 0 0  
Recoveries of loans previously charged off 0 0 0 0  
Ending balance 0 0 0 0  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance 0 0 0 0  
Provision for off-balance sheet credit risk 0 0 0 0  
Ending balance $ 0 0 0 0  
Previously Reported [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance   435,597 388,640 210,759  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance   32,919 36,921 1,585  
Previously Reported [Member] | Commercial [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance   310,422 254,934 118,187  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance   14,582 14,422 1,434  
Previously Reported [Member] | Commercial real estate [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance   68,756 86,558 51,805  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance   16,419 20,571 107  
Previously Reported [Member] | Paycheck Protection Program [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance   0 0 0  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance   0 0 0  
Previously Reported [Member] | Loans to individuals [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance   56,419 47,148 23,572  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance   1,918 1,928 44  
Previously Reported [Member] | Nonspecific Allowance [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance   0 0 17,195  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance   0 0 0  
Transition Adjustment [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance       25,809  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance   0 0 23,552  
Transition Adjustment [Member] | Commercial [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance       33,681  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance   0 0 10,144  
Transition Adjustment [Member] | Commercial real estate [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance       (4,620)  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance   0 0 11,660  
Transition Adjustment [Member] | Paycheck Protection Program [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance       0  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance   0 0 0  
Transition Adjustment [Member] | Loans to individuals [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance       13,943  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance   0 0 1,748  
Transition Adjustment [Member] | Nonspecific Allowance [Member]          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning balance       (17,195)  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance   $ 0 $ 0 $ 0