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 | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Related Party Transaction [Line Items] | ||||
| Loan servicing fees | $ 21,645 | $ 20,264 | $ 43,374 | $ 40,526 |
| Average MSR portfolio unpaid principal balance | 222,991,951 | 229,124,554 | 224,208,538 | 229,767,433 |
| Mortgage servicing rights recapture fees | 1,474 | 473 | 2,682 | 826 |
| Unpaid principal balance of loans recaptured | 183,050 | 74,208 | 342,522 | 136,281 |
| Loans acquired for sale [Member] | ||||
| Related Party Transaction [Line Items] | ||||
| Loan servicing fees | 285 | 94 | 508 | 184 |
| Average investment in loans acquired for sale at fair value | 2,204,825 | 854,406 | 2,101,729 | 779,997 |
| Loans held for investment [Member] | ||||
| Related Party Transaction [Line Items] | ||||
| Loan servicing fees | 226 | 63 | 394 | 125 |
| Loans at fair value | 3,766,027 | 1,380,857 | 3,199,308 | 1,403,094 |
| Mortgage servicing rights [Member] | ||||
| Related Party Transaction [Line Items] | ||||
| Loan servicing fees | $ 21,134 | $ 20,107 | $ 42,472 | $ 40,217 |