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

No definition available.

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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

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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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Data Type:	xbrli:monetaryItemType
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- Definition

+ References

No definition available.

+ Details

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- References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
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- References

No definition available.

+ Details

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- 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

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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

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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

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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

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Data Type:	xbrli:stringItemType
Balance Type:	na
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- 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

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- Definition

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

+ References

No definition available.

+ Details

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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

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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

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- Details

Name:	us-gaap_DebtInstrumentAxis=us-gaap_NotesPayableOtherPayablesMember
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- Details

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

- Details

Name:	us-gaap_TransactionTypeAxis=pfsi_SyndicatedRepurchaseAgreementServicingAdvanceReceivablesMember
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Short-Term Debt - Mortgage Loan Participation and Sale Agreement (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	Jul. 30, 2021
Carrying value:
Mortgage loan participation and sale agreement secured by mortgage loan participation certificates	$ 367,473,000		$ 367,473,000		$ 479,845,000
Fair value of loans pledged to secure	385,944,000		385,944,000		505,716,000
Mortgage Loan Participation and Sale Agreement member
During the period:
Average balance	$ 210,639,000	$ 237,849,000	$ 216,167,000	$ 256,109,000
Weighted-average interest rate (as a percent)	3.65%	1.44%	2.53%	1.38%
Total interest expense	$ 2,073,000	$ 1,026,000	$ 4,570,000	$ 3,160,000
Carrying value:
Unpaid principal balance of mortgage loan participation and sale agreement secured by mortgage loan participation certificates	367,997,000		367,997,000		479,845,000
Unamortized debt issuance costs	(524,000)		(524,000)
Mortgage loan participation and sale agreement secured by mortgage loan participation certificates	$ 367,473,000		$ 367,473,000		$ 479,845,000
Weighted average interest rate (as a percent)	4.48%		4.48%		1.48%
Fair value of loans pledged to secure	$ 385,944,000		$ 385,944,000		$ 505,716,000
Amortization of debt issuance costs	135,000	172,000	479,000	516,000
Mortgage Loan Participation and Sale Agreement member \| Maximum
Carrying value:
Mortgage loan participation and sale agreement secured by mortgage loan participation certificates	507,297,000	532,819,000	515,043,000	532,819,000
Note Payable
Carrying value:
Unamortized debt issuance costs	(6,028,000)		(6,028,000)		$ (2,378,000)
Amortization of debt issuance costs	$ 726,000	$ 570,000	$ 1,700,000	$ 1,700,000
Syndicated Repurchase Agreement
Short-term Debt [Line Items]
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