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Summary of Significant Accounting Policies Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Property, Plant and Equipment [Line Items]        
Days past due for nonaccrual status 90 days      
Increase in ACL $ 379,156 $ 293,404 $ 269,366 $ 249,001
Change in retained earnings 1,775,620 1,619,300    
Change in ACL for certain OBS credit exposure $ 1,200 2,700    
Financing receivable, obtaining certified third-party appraisal for impaired loans, period 12 months      
Extension term of leases 5 years      
Business Combinations [Abstract]        
Foreign currency open position $ 500      
Building and Building Improvements        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment, useful life 50 years      
Furniture and Fixtures        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment, useful life 8 years      
Equipment        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment, useful life 7 years      
Consumer Loan        
Property, Plant and Equipment [Line Items]        
Number of days closed end consumer loans are charged off when they become past due 120 days      
Number of days open end consumer loans are charged off when they become past due 180 days      
Residential mortgage        
Property, Plant and Equipment [Line Items]        
Change in ACL for certain OBS credit exposure $ 1,500 $ 1,800    
Employee Equity Plan        
Business Combinations [Abstract]        
Award vesting period 3 years      
Directors' Plan        
Business Combinations [Abstract]        
Award vesting period 1 year      
Minimum        
Property, Plant and Equipment [Line Items]        
Remaining lease term of operating leases 1 year      
Maximum        
Property, Plant and Equipment [Line Items]        
Remaining lease term of operating leases 20 years