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Loans and Allowance for Loan Losses - Narrative (Details) - USD ($)
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total loans $ 42,648,738,000   $ 42,609,028,000  
Land held for future development, period 1 year      
Financing receivable, allowance for credit loss $ 478,207,000 $ 492,661,000 486,845,000 $ 479,385,000
Reserve for unfunded commitments 50,700,000   52,500,000  
All financing receivable, allowance for credit loss 528,900,000   $ 539,300,000  
Increase (decrease) in allowance for credit loss $ (10,400,000)      
ACL to loans ratio (as percent) 1.24%   1.27%  
Allowance for credit loss, reasonable and supportable forecast period (in year) 2 years      
Allowance for credit loss, straight-line basis historical period (in year) 1 year      
Allowance for credit loss, measurement input, estimated peak weighted average unemployment rate 4.90%   4.60%  
Financing receivable, modified, subsequent default $ 0 $ 71,600,000    
Commitments to land additional funds to TDRs $ 0   $ 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]        
Total loans $ 24,900,000,000   $ 24,660,000,000