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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, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Sep. 30, 2024	May 31, 2025	Feb. 28, 2025	Dec. 31, 2024
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Average period to securitization			30 days
MSRs retained	$ 82.4	$ 67.7	$ 142.9	$ 102.4
Percentage of loan transferred through securitization 60 days or more past due			2.00%		2.70%
Threshold period past due	60 days		60 days					60 days
Maximum borrowing capacity						$ 350.0
Percentage Of The Limited Liability Company Interest	100.00%		100.00%				100.00%
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	$ 200.0		$ 200.0					$ 200.0
Warehouse Mortgage Loan Financing Facility | Variable Interest Entity, Primary Beneficiary
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	335.7		335.7					375.4
Loans held for sale pledged as a collateral	200.0		200.0					$ 200.0
Mortgage Warehouse Agreement Two | Variable Interest Entity, Primary Beneficiary
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	286.2		286.2
Loans held for sale pledged as a collateral	310.5		310.5
Maximum borrowing capacity	$ 350.0		$ 350.0
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			5.10%		7.00%
Threshold period past due	60 days		60 days					60 days

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Time period in which securitization takes place after loan closing or purchase.

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Percentage of loan transferred through securitization 60 days or more past due.

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The amount of mortgage servicing rights (MSRs) retained in connection with transfer of securitized loans accounted for as sales.

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Amount of securities, mortgage loans, or other financial instruments pledged as collateral for deposits.

+ References

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Threshold period for when financing receivable is considered past due, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Excludes threshold period past due to write off as uncollectible.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Fair value portion of mortgage loans held-for-sale.

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