Commitments and Contingencies - Company's Outstanding Contractual Commitments (Detail) $ in Thousands	Mar. 31, 2026 USD ($)
Commitments to purchase mortgage loans:
Commitments to purchase loans held for sale from PLS	$ 1,338,161

Represents disclosure of amount of the company's contractual commitments to purchase recently originated mortgage loans.

No definition available.

Name:	pmt_MortgageLoansHeldForSaleOutstandingContractualPurchaseCommitments
Namespace Prefix:	pmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant