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Securitizations and Variable Interests Entities - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Servicing Assets at Fair Value [Line Items]      
Average period to securitization 30 days    
Financing Receivable, Threshold Period Past Due 60 days 60 days  
Mortgages Held-for-sale, Fair Value Disclosure $ 674.2 $ 617.8  
Variable Interest Entity, Primary Beneficiary | Warehouse Mortgage Loan Financing Facility      
Servicing Assets at Fair Value [Line Items]      
Deposit Liabilities, Collateral Issued, Financial Instruments 150.0    
Mortgages Held-for-sale, Fair Value Disclosure 119.5    
Variable Interest Entity, Primary Beneficiary | Mortgage Warehouse Agreement [Member]      
Servicing Assets at Fair Value [Line Items]      
Mortgages Held-for-sale, Fair Value Disclosure $ 150.1    
Ginnie Mae      
Servicing Assets at Fair Value [Line Items]      
Percentage of transferred residential loans serviced 60 days or more past due 8.00% 8.30%  
Financing Receivable, Threshold Period Past Due 60 days    
Forward Loans      
Servicing Assets at Fair Value [Line Items]      
MSRs retained $ 183.0 $ 234.7 $ 222.7
Percentage of transferred residential loans serviced 60 days or more past due 2.80% 2.50%