Mortgage loan servicing fees payable.

No definition available.

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

- Definition

Mortgage loans on real estate adjusted loan commitments.

+ References

No definition available.

+ Details

Name:	pmt_MortgageLoansOnRealEstateAdjustedLoanCommitments
Namespace Prefix:	pmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Mortgage loans on real estate loans commitments multiplier.

+ References

No definition available.

+ Details

Name:	pmt_MortgageLoansOnRealEstateLoansCommitmentsMultiplier
Namespace Prefix:	pmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Mortgage loans on real estate number of loans purchased.

+ References

No definition available.

+ Details

Name:	pmt_MortgageLoansOnRealEstateNumberOfLoansPurchased
Namespace Prefix:	pmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Mortgage loans on real estate number of loans purchased multiplier.

+ References

No definition available.

+ Details

Name:	pmt_MortgageLoansOnRealEstateNumberOfLoansPurchasedMultiplier
Namespace Prefix:	pmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage of right to purchase non-government insured or guaranteed loans.

+ References

No definition available.

+ Details

Name:	pmt_PercentageOfRightToPurchaseNongovernmentInsuredOrGuaranteedLoans
Namespace Prefix:	pmt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Service Agreement Maturity Renewal Term

+ References

No definition available.

+ Details

Name:	pmt_ServiceAgreementMaturityRenewalTerm
Namespace Prefix:	pmt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Services Agreement Expiration Date

+ References

No definition available.

+ Details

Name:	pmt_ServicesAgreementExpirationDate
Namespace Prefix:	pmt_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Fee expressed in basis points of the unpaid principal balance earned by the Company relating to transfers of government-insured or guaranteed mortgage loans that it purchases from correspondent lenders to an affiliate.

+ References

No definition available.

+ Details

Name:	pmt_SourcingFeeOnUnpaidPrincipalBalance
Namespace Prefix:	pmt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Subsection 29
-Publisher SEC

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 948
-SubTopic 310
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479628/948-310-S99-1

+ Details

Name:	srt_MortgageLoansOnRealEstateLineItems
Namespace Prefix:	srt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=pmt_TwentyTwentyMBSAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateLoanTypeAxis=pmt_FannieMaeOrFreddieMacMortgageLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateLoanTypeAxis=pmt_GinnieMaeMortgageLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=pmt_TwentyTwentyMBSAgreementRenewedAndAmendedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Transactions with Related Parties - Mortgage Banking Servicing Agreement - Additional Information (Detail) - USD ($)	1 Months Ended	6 Months Ended	12 Months Ended
	Dec. 31, 2024	Jun. 30, 2025	Dec. 31, 2024
2020 MBS Agreement [Member]
Mortgage Loans On Real Estate [Line Items]
Servicing agreement expiration date		Dec. 31, 2029
Service agreement maturity renewal term		18 months
2020 MBS Agreement [Member] \| Fannie Mae Or Freddie Mac Mortgage Loans [Member]
Mortgage Loans On Real Estate [Line Items]
Number of mortgage loans purchased multiplier	$ 750	$ 500
2020 MBS Agreement [Member] \| Ginnie Mae Mortgage Loans [Member]
Mortgage Loans On Real Estate [Line Items]
Mortgage loan servicing fees payable		0
2020 MBS Agreement [Member] \| Maximum [Member]
Mortgage Loans On Real Estate [Line Items]
Mortgage loans commitments multiplier	585	585
Mortgage adjusted loan commitments	16,500	16,500
Number of mortgage loans purchased multiplier	315	315
Number of mortgage loans purchased	16,500	$ 16,500
Interest income and sourcing fee		2.00%
2020 MBS Agreement [Member] \| Minimum [Member]
Mortgage Loans On Real Estate [Line Items]
Mortgage loans commitments multiplier	355	$ 355
Mortgage adjusted loan commitments	16,500	16,500
Number of mortgage loans purchased multiplier	195	195
Number of mortgage loans purchased	$ 16,500	$ 16,500
Interest income and sourcing fee		1.00%
2020 MBS Agreement Renewed and Amended [Member]
Mortgage Loans On Real Estate [Line Items]
Percentage of right to purchase non-government insured or guaranteed loans			100.00%