Represents the interest expense related to mortgage loans participation and sale agreement.

No definition available.

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

- Definition

Participation certificates in mortgage loans that have been pooled with Fannie Mae, Freddie Mac or Ginnie Mae, are issued to a lender pending the securitization of the mortgage loans and sale of the resulting securities.

+ References

No definition available.

+ Details

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

- Definition

Amount of unpaid principal balance of mortgage loan participation and sale agreement

+ References

No definition available.

+ Details

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

- Definition

+ References

No definition available.

+ Details

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

- References

No definition available.

+ Details

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

- References

No definition available.

+ Details

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

- Definition

The number of existing variable funding note repurchase agreements.

+ References

No definition available.

+ Details

Name:	pfsi_NumberOfExistingVariableFundingNoteRepurchaseAgreements
Namespace Prefix:	pfsi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of indirect wholly owned subsidiaries entered into agreements.

+ References

No definition available.

+ Details

Name:	pfsi_NumberOfIndirectWhollyOwnedSubsidiaries
Namespace Prefix:	pfsi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The sum of the carrying amounts, as of the date of the latest financial statement presented, of loans receivable which are owned but transferred to serve as collateral for the payment of related debt obligations, and for which the transferees are not permitted to sell or re-pledge them to an unrelated party.

+ References

No definition available.

+ Details

Name:	pfsi_PledgedFinancialInstrumentsNotSeparatelyReportedLoansReceivablePledgedAsCollateralForParticipatingAndSaleAgreement
Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the maximum aggregate purchase price per the amended repurchase agreement.

+ References

No definition available.

+ Details

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

- Definition

Represents the previous maximum aggregate purchase price per the amended repurchase agreement.

+ References

No definition available.

+ Details

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

- Definition

Amount of amortization expense attributable to debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(8))
-URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1F
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495355-112611

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399

+ Details

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

- Definition

Weighted average interest rate of short-term debt outstanding calculated at point in time.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_ShortTermDebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Weighted average interest rate of short-term debt outstanding calculated over time.

+ References

No definition available.

+ Details

Name:	us-gaap_ShortTermDebtWeightedAverageInterestRateOverTime
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1402
-Paragraph (a)

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1402
-Paragraph (b)
-Subparagraph (1)

+ Details

Name:	us-gaap_ShorttermDebtAverageOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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

- Details

Name:	us-gaap_DebtInstrumentAxis=pfsi_MortgageLoanParticipationAndSaleAgreementMember
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:	us-gaap_DebtInstrumentAxis=us-gaap_NotesPayableOtherPayablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TransactionTypeAxis=pfsi_SyndicatedRepurchaseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TransactionTypeAxis=pfsi_SyndicatedRepurchaseAgreementServicingAdvanceReceivablesMember
Namespace Prefix:
Data Type:	na
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Period Type:

Short-Term Debt - Mortgage Loan Participation and Sale Agreement (Details)	3 Months Ended
	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)	Jul. 30, 2021 USD ($) item
Carrying value:
Mortgage loan participation and sale agreement secured by mortgage loan participation certificates	$ 494,396,000		$ 479,845,000
Fair value of loans pledged to secure	523,742,000		505,716,000
Mortgage Loan Participation and Sale Agreement member
During the period:
Average balance	$ 223,347,000	$ 276,561,000
Weighted-average interest rate (as a percent)	1.72%	1.34%
Total interest expense	$ 1,120,000	$ 1,095,000
Carrying value:
Unpaid principal balance of mortgage loan participation and sale agreement secured by mortgage loan participation certificates	494,539,000		479,845,000
Unamortized debt issuance costs	(143,000)
Mortgage loan participation and sale agreement secured by mortgage loan participation certificates	$ 494,396,000		$ 479,845,000
Weighted average interest rate (as a percent)	1.83%		1.48%
Fair value of loans pledged to secure	$ 523,742,000		$ 505,716,000
Amortization of debt issuance costs	172,000	172,000
Mortgage Loan Participation and Sale Agreement member \| Maximum
Carrying value:
Mortgage loan participation and sale agreement secured by mortgage loan participation certificates	515,043,000	528,844,000
Note Payable
Carrying value:
Unamortized debt issuance costs	(1,933,000)		$ (2,378,000)
Amortization of debt issuance costs	$ 459,000	$ 544,000
Syndicated Repurchase Agreement
Short-term Debt [Line Items]
Number of indirect wholly owned subsidiaries entered into agreements \| item				2
The number of existing variable funding note repurchase agreements \| item				2
Previous maximum aggregate purchase price				$ 400,000,000
Maximum aggregate purchase price				500,000,000
Syndicated Repurchase Agreement SAR
Short-term Debt [Line Items]
Maximum aggregate purchase price				$ 600,000,000