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Loans and Allowance for Loan Losses - Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Total loans $ 43,753,234,000   $ 43,753,234,000     $ 42,609,028,000    
Land held for future development, period     1 year          
Financing receivable, allowance for credit loss 469,521,000 $ 484,985,000 $ 469,521,000 $ 484,985,000 $ 464,831,000 486,845,000 $ 485,101,000 $ 479,385,000
Reserve for unfunded commitments 50,700,000   50,700,000     52,500,000    
All financing receivable, allowance for credit loss $ 520,300,000   520,300,000     $ 539,300,000    
Increase (decrease) in allowance for credit loss     $ (19,000,000)          
ACL to loans ratio (as percent) 1.19%   1.19%     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 4.70%   4.70%     4.60%    
Financing receivable, modified, subsequent default $ 0 $ 0 $ 0 $ 74,700,000        
Commitments to land additional funds to TDRs 0   $ 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 $ 23,280,000,000   $ 23,280,000,000     $ 24,660,000,000