Name:	pfsi_ExcessServicingSpreadFinancingAtFairValue
Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Average excess servicing spread on financial assets of a securitization, asset-backed financing arrangement, or similar transfer regardless of when the transfer occurred.

No definition available.

Name:	pfsi_ExcessServicingSpreadFinancingAverageExcessServicingSpreadRate
Namespace Prefix:	pfsi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Excess servicing spread on average servicing fee rate of underlying mortgage loans.

No definition available.

Name:	pfsi_ExcessServicingSpreadFinancingAverageServicingFeeRateOfUnderlyingMortgageLoans
Namespace Prefix:	pfsi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Value of input used to measure investment in excess servicing spread financing measured at fair value.

No definition available.

Name:	pfsi_ExcessServicingSpreadFinancingMeasurementInput
Namespace Prefix:	pfsi_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

Represents the excess servicing spread financing unpaid principal balance of underlying mortgage loans.

No definition available.

Name:	pfsi_ExcessServicingSpreadFinancingUnpaidPrincipalBalanceOfUnderlyingMortgageLoans
Namespace Prefix:	pfsi_
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.

Name:	us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Name:	us-gaap_FinancialInstrumentAxis=pfsi_ExcessServicingSpreadFinancingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_MeasurementInputTypeAxis=pfsi_MeasurementInputPricingSpreadMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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

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

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

Name:	us-gaap_MeasurementInputTypeAxis=pfsi_MeasurementInputAnnualTotalPrepaymentSpeedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: