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Securitizations and Variable Interest Entities - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]          
Average period to securitization     30 days    
MSRs retained $ 71.4 $ 70.2 $ 134.0 $ 176.2  
Percentage of loan transferred through securitization 60 days or more past due     2.40%   2.50%
Threshold period past due 60 days   60 days   60 days
Mortgages Held-for-sale, Fair Value Disclosure $ 944.7 $ 725.2 $ 944.7 $ 725.2  
Mortgage Warehouse Agreement | Variable Interest Entity, Primary Beneficiary          
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]          
Mortgages Held-for-sale, Fair Value Disclosure 150.0   150.0    
Warehouse Mortgage Loan Financing Facility | Variable Interest Entity, Primary Beneficiary          
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]          
Loans held for sale pledged as a collateral 150.0   150.0    
Mortgages Held-for-sale, Fair Value Disclosure $ 127.4   $ 127.4    
Ginnie Mae Loans          
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]          
Percentage of loan transferred through securitization 60 days or more past due     7.20%   8.30%
Threshold period past due 60 days   60 days   60 days