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Loans and Allowances for Credit Losses, Activity in Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance $ 388,640 $ 236,568  
Provision for loan losses (21,770) 95,964  
Loans charged off (16,905) (18,917)  
Recoveries of loans previously charged off 2,437 1,696  
Ending balance 352,402 315,311  
Provision Details [Abstract]      
Change in provision due to changes in reasonable and supportable forecasts, primarily due to COVID-19 pandemic (31,100)    
Other changes to provision 5,200    
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Beginning balance 36,921 25,137  
Provision for off-balance sheet credit risk (4,044) 3,377  
Ending balance 32,877 28,514  
Recorded investment [Abstract]      
Collectively measured for impairment, recorded investment 22,317,828   $ 22,772,827
Individually measured for impairment, recorded investment 216,019   234,693
Total 22,533,847   23,007,520
Related allowance [Abstract]      
Collectively measured for impairment, related allowance 332,351   366,199
Individually measured for impairment, related allowance 20,051   22,441
Total 352,402   388,640
Commercial [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 254,934 151,868  
Provision for loan losses (9,893) 77,723  
Loans charged off (15,345) (16,615)  
Recoveries of loans previously charged off 1,676 462  
Ending balance 231,372 213,438  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Beginning balance 14,422 11,578  
Provision for off-balance sheet credit risk (1,686) 2,462  
Ending balance 12,736 14,040  
Recorded investment [Abstract]      
Collectively measured for impairment, recorded investment 12,510,711   12,910,376
Individually measured for impairment, recorded investment 147,073   167,159
Total 12,657,784   13,077,535
Related allowance [Abstract]      
Collectively measured for impairment, related allowance 214,711   235,882
Individually measured for impairment, related allowance 16,661   19,052
Total 231,372   254,934
Commercial real estate [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 86,558 47,185  
Provision for loan losses (4,579) 5,115  
Loans charged off (263) (886)  
Recoveries of loans previously charged off 30 47  
Ending balance 81,746 51,461  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Beginning balance 20,571 11,767  
Provision for off-balance sheet credit risk (2,273) 808  
Ending balance 18,298 12,575  
Recorded investment [Abstract]      
Collectively measured for impairment, recorded investment 4,476,104   4,671,292
Individually measured for impairment, recorded investment 27,243   27,246
Total 4,503,347   4,698,538
Related allowance [Abstract]      
Collectively measured for impairment, related allowance 78,356   83,169
Individually measured for impairment, related allowance 3,390   3,389
Total 81,746   86,558
Paycheck Protection Program [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 0 0  
Provision for loan losses 0 0  
Loans charged off 0 0  
Recoveries of loans previously charged off 0 0  
Ending balance 0 0  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Beginning balance 0 0  
Provision for off-balance sheet credit risk 0 0  
Ending balance 0 0  
Recorded investment [Abstract]      
Collectively measured for impairment, recorded investment 1,848,550   1,682,310
Individually measured for impairment, recorded investment 0   0
Total 1,848,550   1,682,310
Related allowance [Abstract]      
Collectively measured for impairment, related allowance 0   0
Individually measured for impairment, related allowance 0   0
Total 0   0
Loans to individuals [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 47,148 37,515  
Provision for loan losses (7,298) 13,126  
Loans charged off (1,297) (1,416)  
Recoveries of loans previously charged off 731 1,187  
Ending balance 39,284 50,412  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Beginning balance 1,928 1,792  
Provision for off-balance sheet credit risk (85) 107  
Ending balance 1,843 1,899  
Recorded investment [Abstract]      
Collectively measured for impairment, recorded investment 3,482,463   3,508,849
Individually measured for impairment, recorded investment 41,703   40,288
Total 3,524,166   3,549,137
Related allowance [Abstract]      
Collectively measured for impairment, related allowance 39,284   47,148
Individually measured for impairment, related allowance 0   0
Total 39,284   $ 47,148
Nonspecific Allowance [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 0 0  
Provision for loan losses 0 0  
Loans charged off 0 0  
Recoveries of loans previously charged off 0 0  
Ending balance 0 0  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Beginning balance 0 0  
Provision for off-balance sheet credit risk 0 0  
Ending balance $ 0 0  
Previously Reported [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance   210,759  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Beginning balance   1,585  
Previously Reported [Member] | Commercial [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance   118,187  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Beginning balance   1,434  
Previously Reported [Member] | Commercial real estate [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance   51,805  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Beginning balance   107  
Previously Reported [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  
Previously Reported [Member] | Loans to individuals [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance   23,572  
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Beginning balance   44  
Previously Reported [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  
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   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   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   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  
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   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