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Loans and Allowance for Loan Losses - Narrative (Details)
 12 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
contract
Dec. 31, 2021
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans $ 42,609,028,000 $ 43,404,490,000    
Land held for future development, period 1 year      
Financing receivable, allowance for credit loss $ 486,845,000 479,385,000 $ 443,424,000 $ 427,597,000
Reserve for unfunded commitments 52,500,000 57,200,000    
All financing receivable, allowance for credit loss 539,300,000 $ 536,600,000    
ACL increase $ 2,700,000      
ACL to loans ratio 1.27%      
Increase in ACL to loans ratio 0.0003      
Allowance for credit loss, reasonable and supportable forecast period 2 years      
Allowance for credit loss, straight-line basis historical period 1 year      
Estimated unemployment rate 4.60% 4.50%    
Material FDMs subsequently defaulted $ 3,200,000 $ 0    
Commitments to lend additional funds to TDRs 0 0    
Modifications, post-modification recorded investment     131,186,000  
Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Charge-off of previously established reserves for credit losses associated with the transfer to held for sale   31,300,000    
Reclassification to held-for-sale   1,590,000,000    
Financing receivable, allowance for credit loss $ 142,299,000 126,657,000 $ 138,299,000 $ 141,473,000
Troubled Debt Restructuring Subsequently Defaulted        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Subsequent default, number of contracts | contract     5  
Modifications, post-modification recorded investment     $ 1,000,000.0  
Substandard        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Retail loan substandard period (in days) 90 days      
Loss        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Retail loan charge off (in days) 120 days      
Asset Pledged as Collateral        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans $ 24,660,000,000 $ 24,310,000,000