The amount of fulfilment fee payable or due to affiliates.

No definition available.

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

- Definition

Gain Loss On Sales Of Loans From Affiliates.

+ References

No definition available.

+ Details

Name:	pfsi_GainLossOnSalesOfLoansFromAffiliates
Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represent fees for services the company performs on behalf of PMT in connection with the acquisition, packaging and sale of mortgage loans.

+ References

No definition available.

+ Details

Name:	pfsi_LoanFulfillmentFeesReceivableFromAffiliate
Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of maximum multiplier factor for each pull through adjusted loan commitment.

+ References

No definition available.

+ Details

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

- Definition

Represents the recapture expense incurred relating to mortgage loans subject to either MSRs or ESS owned by a related party that were refinanced by the Company.

+ References

No definition available.

+ Details

Name:	pfsi_MortgageServicingRightsMSRsRecaptureRecognized
Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Multiplying factor for each pull through adjusted loan commitment in excess of threshold limit per quarter.

+ References

No definition available.

+ Details

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

- Definition

Multiplying factor for number of purchased loans.

+ References

No definition available.

+ Details

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

- Definition

The amount of Multiplying factor for number of purchased loans in excess of threshold limit per quarter.

+ References

No definition available.

+ Details

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

- Definition

Represents the net gains from sale of mortgage loans to related party.

+ References

No definition available.

+ Details

Name:	pfsi_NetGainsFromSaleOfMortgageLoansToRelatedParty
Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage of fair market value.

+ References

No definition available.

+ Details

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

- Definition

Percentage of recapture rate.

+ References

No definition available.

+ Details

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

- Definition

Pull through factor as a percentage.

+ References

No definition available.

+ Details

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

- Definition

the administrative fee plus accrued interest and sourcing fee percent.

+ References

No definition available.

+ Details

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

- Definition

The renewal period in accordance with the terms of the agreement, for the related party agreement.

+ References

No definition available.

+ Details

Name:	pfsi_RelatedPartyTransactionAgreementTermRenewalPeriod
Namespace Prefix:	pfsi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Fulfillment fee as a percentage of unpaid principal balance of all other mortgage loans, excluding Ginnie Mae.

+ References

No definition available.

+ Details

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

- Definition

Represents the the minimum unpaid principal balance of mortgage loans refinanced by the Company, for which a related party previously held the mortgage servicing rights, requiring the Company to transfer the mortgage servicing rights of the new loan to related party.

+ References

No definition available.

+ Details

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

- References

No definition available.

+ Details

Name:	pfsi_RelatedPartyTransactionsLendingActivityAbstract
Namespace Prefix:	pfsi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents a fee paid to a related party relating to mortgage loans purchased from the related party through its correspondent lending activities.

+ References

No definition available.

+ Details

Name:	pfsi_RelatedPartyTransactionsSourcingFeesPaid
Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents a percentage of related party fees relating to mortgage loans purchased from the related party through its correspondent lending activities.

+ References

No definition available.

+ Details

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

- Definition

Represents the tax service fee receivable from transactions with related parties.

+ References

No definition available.

+ Details

Name:	pfsi_RelatedPartyTransactionsTaxServiceFeeReceivable
Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents unpaid principal balance of loans purchased.

+ References

No definition available.

+ Details

Name:	pfsi_RelatedPartyTransactionsUnpaidPrincipalBalanceOfLoansPurchased
Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage of target recapture date

+ References

No definition available.

+ Details

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

- Definition

The amount of threshold limit for loan commitment per quarter.

+ References

No definition available.

+ Details

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

- Definition

The cash inflow resulting from the sale of loans classified as held-for-sale, including proceeds from loans sold through mortgage securitization.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 16
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3337-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 21
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3461-108585

+ Details

Name:	us-gaap_ProceedsFromSaleOfLoansHeldForSale
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

No definition available.

+ Details

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

- Details

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

- Details

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

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=pfsi_MortgageBankingServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=pfsi_MortgageServicingRightsRecaptureAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=pfsi_RecaptureRateUpto15PercentageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=pfsi_RecaptureRateInExcessOf15PercentageAndUpto30PercentageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=pfsi_RecaptureRateInExcessOf30PercentageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=pfsi_MortgageLendingAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=pfsi_PennyMacLoanServicesLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Related Party Transactions - Correspondent Production (Details) - USD ($)				3 Months Ended		6 Months Ended
	Jul. 01, 2020	Jun. 30, 2020	Sep. 12, 2016	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Lending activity between the entity and affiliate
Fulfillment fee revenue						$ 114,855,000	$ 94,755,000
Ginnie Mae Mortgage Backed Securities Guide Loan
Transactions with Affiliates
Threshold limit of loan commitment	$ 16,500
Maximum Multiplier factor for each pull through adjusted loan commitment	585
Multiplying factor for each pull through adjusted loan commitment in excess of threshold limit per quarter	355
Multiplying factor for number of purchased loans	315
Multiplying factor for number of purchased loans in excess of threshold limit per quarter	$ 195
Ginnie Mae Mortgage Backed Securities Guide Loan \| Minimum
Transactions with Affiliates
Pull through factor as a percentage	80.00%
Ginnie Mae Mortgage Backed Securities Guide Loan \| Maximum
Transactions with Affiliates
Pull through factor as a percentage	99.00%
Other mortgage loans
Transactions with Affiliates
Multiplying factor for number of purchased loans	$ 750
MBS Agreement
Transactions with Affiliates
The administrative fee plus accrued interest and sourcing fee percent			0.35%
Fulfillment fee as a percent of UPB of all other mortgage loans, excluding Ginnie Mae mortgage loans			0.50%
MSR Recapture Agreement
Transactions with Affiliates
Target recapture rate	15.00%
Lending activity between the entity and affiliate
Minimum percent of total UPB of loans originated from refinancing of loans which a related party previously held the MSR required to be transferred			30.00%
Related party transaction, renewal period		5 years
MSR Recapture Agreement \| First 15%
Transactions with Affiliates
Percentage of fair market value.	40.00%
Percentage of recapture rate.	15.00%
MSR Recapture Agreement \| In excess of 15% and upto 30%
Transactions with Affiliates
Percentage of fair market value.	35.00%
MSR Recapture Agreement \| In excess of 30%
Transactions with Affiliates
Percentage of fair market value.	30.00%
Percentage of recapture rate.	30.00%
MSR Recapture Agreement \| Minimum \| In excess of 15% and upto 30%
Transactions with Affiliates
Percentage of recapture rate.	15.00%
MSR Recapture Agreement \| Maximum \| In excess of 15% and upto 30%
Transactions with Affiliates
Percentage of recapture rate.	30.00%
PMT
Lending activity between the entity and affiliate
Total of gain on sale of loans and MSR recapture				$ (11,548,000)	$ (5,592,000)	(25,796,000)	72,324,000
Sale of loans held for sale to PMT							2,248,869,000
Fulfillment fee revenue				54,020,000	52,815,000	114,855,000	94,755,000
Proceeds from sale of mortgage loans held for sale to PennyMac Mortgage Investment Trust							2,248,869,000
PMT \| MBS Agreement \| Minimum
Transactions with Affiliates
The administrative fee plus accrued interest and sourcing fee percent			0.02%
PMT \| MBS Agreement \| Maximum
Transactions with Affiliates
The administrative fee plus accrued interest and sourcing fee percent			0.035%
PMT \| Loan Lending
Lending activity between the entity and affiliate
Net gain on loans held for sale to PMT					70,000		81,294,000
Mortgage servicing rights and excess servicing spread recapture incurred				(11,548,000)	(5,662,000)	(25,796,000)	(8,970,000)
Total of gain on sale of loans and MSR recapture				(11,548,000)	(5,592,000)	(25,796,000)	72,324,000
Sale of loans held for sale to PMT					2,742,000		2,248,869,000
Tax service fee				7,128,000	4,288,000	15,320,000	8,268,000
Fulfillment fee revenue				54,020,000	52,815,000	114,855,000	94,755,000
Sourcing fees paid				1,630,000	3,324,000	3,368,000	7,485,000
Unpaid principal balance of loans purchased from PMT				$ 16,297,216,000	11,080,565,000	$ 33,856,791,000	24,950,845,000
Proceeds from sale of mortgage loans held for sale to PennyMac Mortgage Investment Trust					$ 2,742,000		$ 2,248,869,000
PLS \| Minimum
Transactions with Affiliates
Sourcing fees (as a percent)	0.01%
PLS \| Maximum
Transactions with Affiliates
Sourcing fees (as a percent)	0.02%
PLS \| Ginnie Mae Mortgage Backed Securities Guide Loan
Transactions with Affiliates
Fulfilment fee payable	$ 0