v3.26.3
Transactions with Related Parties - Summary of Loan Servicing Fees Earned and Mortgage Servicing Rights Recaptured Income Earned (Detail) - PennyMac Loan Services, LLC [Member] - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Related Party Transaction [Line Items]        
Loan servicing fees $ 20,449 $ 21,012 $ 59,812 $ 64,386
Average MSR portfolio unpaid principal balance 200,144,607 220,178,747 207,765,234 222,854,243
Mortgage servicing rights recapture fees 2,948 3,345 13,612 6,027
Unpaid principal balance of loans recaptured 226,618 205,055 1,258,774 547,577
Loans held for sale [Member]        
Related Party Transaction [Line Items]        
Loan servicing fees 144 383 444 891
Average investment in loans acquired for sale at fair value 2,963,582 2,058,167 2,749,705 2,087,048
Loans held for investment [Member]        
Related Party Transaction [Line Items]        
Loan servicing fees 1,803 (233) 3,437 161
Loans at fair value 13,511,698 5,235,047 11,627,812 3,885,345
Mortgage servicing rights [Member]        
Related Party Transaction [Line Items]        
Loan servicing fees $ 18,502 $ 20,862 $ 55,931 $ 63,334