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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

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- Definition Percentage of loan transferred through securitization 60 days or more past due. + References No definition available. + Details
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