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Securitizations and Variable Interest Entities - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Sep. 30, 2023
Dec. 31, 2023
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]            
Average period to securitization     30 days      
MSRs retained $ 67.7 $ 31.5 $ 102.4 $ 62.6    
Percentage of loan transferred through securitization 60 days or more past due     2.50%   2.80%  
Threshold period past due 60 days   60 days     60 days
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 $ 200.1   $ 200.1     $ 150.1
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 200.0   200.0     150.0
Mortgages Held-for-sale, Fair Value Disclosure $ 228.7   $ 228.7     $ 119.5
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     7.30%   8.00%  
Threshold period past due 60 days   60 days     60 days