Name:	pfsi_AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPerLoanCostOfServicing
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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

Servicing fee rate relating to mortgage loans underlying servicing liability.

No definition available.

Name:	pfsi_ServicingLiabilityServicingFeeRateOfUnderlyingLoans
Namespace Prefix:	pfsi_
Data Type:	dtr-types:percentItemType
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Unpaid principal balance of mortgage loans underlying fair value of servicing liability.

No definition available.

Name:	pfsi_ServicingLiabilityUnpaidPrincipalBalanceOfUnderlyingLoans
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Data Type:	xbrli:monetaryItemType
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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.

Name:	us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionLineItems
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Aggregate amount of servicing liabilities that are subsequently measured at fair value and servicing liabilities that are subsequently measured using the amortization method.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745

Name:	us-gaap_ServicingLiability
Namespace Prefix:	us-gaap_
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Value of input used to measure servicing liability.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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Data Type:	xbrli:decimalItemType
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