Name:	pmt_LoanFulfillmentFeesPayableToAffiliate
Namespace Prefix:	pmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the unpaid principal balance of mortgage loans fulfilled for the company by an affiliate in exchange for fulfillment fees.

No definition available.

Name:	pmt_LoansFulfilledByAffiliateUnpaidPrincipalBalance
Namespace Prefix:	pmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Mortgage banking and warehouse services fees paid to affiliates.

No definition available.

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

Represents fees received by the company from an affiliate for mortgage loans that it purchases from correspondent lenders to but is not licensed as a seller/servicer to sell such loans into the secondary market.

No definition available.

Name:	pmt_MortgageLoanSourcingFeesFromAffiliate
Namespace Prefix:	pmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Unpaid principal balance of mortgage loans sold to affiliates during the period.

No definition available.

Name:	pmt_MortgageLoansSoldToAffiliatesUnpaidPrincipalBalance
Namespace Prefix:	pmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents payments to purchase mortgage loans held for sale from an affiliate.

No definition available.

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

Represents tax service fees paid to an affiliate relating to mortgage loans fulfilled for the company by the affiliate.

No definition available.

Name:	pmt_TaxServiceFeesPaid
Namespace Prefix:	pmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Fair value portion of mortgage loans held-for-sale.

No definition available.

Name:	us-gaap_MortgagesHeldForSaleFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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.

No definition available.