Transactions with Related Parties - Servicing Agreement - Additional Information (Detail) - PennyMac Loan Services, LLC [Member] - USD ($)		3 Months Ended
Oct. 01, 2025	Mar. 31, 2026
Mortgage Loans On Real Estate [Line Items]
Servicing agreement expiration date		Dec. 31, 2029
Service agreement maturity renewal term		18 months
Servicing Agreement [Member]
Mortgage Loans On Real Estate [Line Items]
Base servicing fees for REO per month		$ 75
Servicing Agreement [Member] \| Minimum [Member]
Mortgage Loans On Real Estate [Line Items]
Additional servicing fees per loan per month		18,000
Servicing Agreement [Member] \| Maximum [Member]
Mortgage Loans On Real Estate [Line Items]
Additional servicing fees per loan per month		80,000
Servicing Agreement [Member] \| Fixed-Rate Mortgage Loans [Member]
Mortgage Loans On Real Estate [Line Items]
Base servicing fees per month	$ 7	7.5
Servicing Agreement [Member] \| Adjustable rate mortgage loans [Member]
Mortgage Loans On Real Estate [Line Items]
Base servicing fees per month	$ 8	$ 8.5

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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