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Securitizations and Variable Interest Entities - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Jun. 30, 2023 | Mar. 04, 2024 | Dec. 31, 2023
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items] |  |  |  |  |
Average period to securitization | 30 days |  |  |  |
MSRs retained | $ 34.7 | $ 31.1 |  |  |
Percentage of loan transferred through securitization 60 days or more past due | 2.70% |  | 2.80% |  |
Threshold period past due | 60 days |  |  |  | 60 days
Assets Sold under Agreements to Repurchase, Carrying Amount |  |  |  | $ 34.0 |
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 | $ 150.1 |  |  |  | $ 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 | 150.0 |  |  |  | 150.0
Mortgages Held-for-sale, Fair Value Disclosure | $ 241.5 |  |  |  | $ 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 | 7.60% |  | 8.00% |  |
Threshold period past due | 60 days |  |  |  | 60 days

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- Definition Carrying amount of assets sold under agreements to repurchase when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under repurchase agreements exceeds 10 percent of total assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(m)(1)(i)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(m)(1)(ii)(A)(i)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 + Details
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