The amount of fulfilment fee payable or due to affiliates.

No definition available.

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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

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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

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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

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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:	dtr-types: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:	dtr-types: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:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The renewal period that automatically renews at expiration, unless terminated earlier in accordance with the terms of the agreement, for the related party agreement.

+ References

No definition available.

+ Details

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

- Definition

Mortgage loan servicing fee per loan as per arrangements between the reporting entity and related parties.

+ References

No definition available.

+ Details

Name:	pfsi_RelatedPartyTransactionMortgageLoanServicingFeePerLoan
Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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:	dtr-types: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 the unpaid principal balance of loans fulfilled.

+ References

No definition available.

+ Details

Name:	pfsi_RelatedPartyTransactionsUnpaidPrincipalBalanceOfLoansFulfilled
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

Represents unpaid principal balance of loans purchased conventional conforming.

+ References

No definition available.

+ Details

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

- Definition

Represents unpaid principal balance of loans purchased government guaranteed or insured.

+ References

No definition available.

+ Details

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

- Definition

The amount of unpaid principal balance of recaptured from related party.

+ References

No definition available.

+ Details

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

- Definition

The amount of unpaid principal balance of loans sold with related party.

+ References

No definition available.

+ Details

Name:	pfsi_RelatedPartyTransactionsUnpaidPrincipalBalanceOfLoansSold
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:	dtr-types: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 amount of threshold limit for loan per quarter.

+ References

No definition available.

+ Details

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

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(i))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(ii))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(g)(3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

+ Details

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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:
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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

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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

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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Balance Type:
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- Details

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Related Party Transactions - Correspondent Production (Details) - USD ($)			1 Months Ended	3 Months Ended
	Jan. 01, 2025	Jul. 01, 2020	Dec. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Lending activity between the entity and affiliate
Fulfillment fee revenue				$ 5,290,000	$ 4,016,000
Ginnie Mae Mortgage Backed Securities Guide Loan
Transactions with Affiliates
Threshold limit of loan commitment		$ 16,500	$ 16,500
Threshold limit of loan			16,500
Maximum Multiplier factor for each pull through adjusted loan commitment		585	585
Multiplying factor for each pull through adjusted loan commitment in excess of threshold limit per quarter		355	355
Multiplying factor for number of purchased loans		315	500
Multiplying factor for number of purchased loans in excess of threshold limit per quarter		$ 195	$ 195
Ginnie Mae Mortgage Backed Securities Guide Loan \| Minimum
Transactions with Affiliates
Pull through factor as a percentage		80.00%	80.00%
Ginnie Mae Mortgage Backed Securities Guide Loan \| Maximum
Transactions with Affiliates
Pull through factor as a percentage		99.00%	99.00%
Other mortgage loans
Transactions with Affiliates
Multiplying factor for number of purchased loans		$ 750	$ 315
MSR Recapture Agreement
Transactions with Affiliates
Related party transaction, automatic renewal period				18 months
Mortgage loan servicing fee per loan (in dollars)	$ 900
MSR Recapture Agreement \| Minimum
Transactions with Affiliates
Target recapture rate	30.00%
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 15% and upto 30% \| Minimum
Transactions with Affiliates
Percentage of recapture rate.		15.00%
MSR Recapture Agreement \| In excess of 15% and upto 30% \| Maximum
Transactions with Affiliates
Percentage of recapture rate.		30.00%
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 \| First 30%
Transactions with Affiliates
Percentage of fair market value.	70.00%
Percentage of recapture rate.	30.00%
MSR Recapture Agreement \| In excess of 30% and upto 50%
Transactions with Affiliates
Percentage of fair market value.	50.00%
MSR Recapture Agreement \| In excess of 30% and upto 50% \| Minimum
Transactions with Affiliates
Percentage of recapture rate.	30.00%
MSR Recapture Agreement \| In excess of 30% and upto 50% \| Maximum
Transactions with Affiliates
Percentage of recapture rate.	50.00%
MSR Recapture Agreement \| In excess of 50%
Transactions with Affiliates
Percentage of fair market value.	40.00%
Percentage of recapture rate.	50.00%
Related Party \| Mortgage Lending \| PennyMac Mortgage Investment Trust
Lending activity between the entity and affiliate
Net gains on loans sold to PMT (primarily cash)				$ 6,046,000
Mortgage servicing rights recapture incurred				(1,208,000)	(353,000)
Total of gain on sale of loans and MSR recapture				4,838,000	(353,000)
Sale of loans held for sale to PMT				654,808,000
UPB of loans recaptured				159,472,000	62,073,000
Tax service fees earned from PMT included in Loan origination fees				477,000	359,000
Fulfillment fee revenue				5,290,000	4,016,000
Unpaid principal balance of loans fulfilled for PMT subject to fulfillment fees				2,781,722,000	1,771,681,000
Sourcing fees included in cost of loans purchased from PMT				2,015,000	1,605,000
Government guaranteed or insured				11,191,880,000	7,856,925,000
Conventional conforming				8,960,796,000	8,189,930,000
Unpaid principal balance of loans purchased from PMT				$ 20,152,676,000	$ 16,046,855,000
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
PennyMac Mortgage Investment Trust \| Ginnie Mae Mortgage Backed Securities Guide Loan
Transactions with Affiliates
Fulfilment fee payable	$ 0