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Loans and Allowance for Loan Losses - Narrative (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans $ 43,093,397,000   $ 43,093,397,000   $ 43,404,490,000      
Land held for future development, period     1 year          
Financing receivable, allowance for credit loss 485,101,000 $ 471,238,000 $ 485,101,000 $ 471,238,000 479,385,000 $ 492,661,000 $ 457,010,000 $ 443,424,000
Reserve for unfunded commitments 53,100,000   53,100,000   57,200,000      
All financing receivable, allowance for credit loss 538,200,000   $ 538,200,000   $ 536,600,000      
Increase (decrease) in allowance for credit loss $ 1,500,000              
ACL to loans ratio (as percent) 1.25%   1.25%   1.24%      
Increase in ACL to loans ratio     0.0001          
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 4.40%   4.40%   4.50%      
Financing receivable, modified, subsequent default $ 3,100,000 0 $ 74,700,000 0        
Commitments to land additional funds to TDRs 0   0   $ 0      
Total 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   1,300,000   7,900,000 31,300,000      
Reclassification to held-for-sale   3,800,000   427,900,000        
Financing receivable, allowance for credit loss 122,691,000 $ 141,525,000 $ 122,691,000 $ 141,525,000 126,657,000 $ 126,552,000 $ 137,930,000 $ 138,299,000
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 $ 25,090,000,000.00   $ 25,090,000,000.00   $ 24,310,000,000