The stated interest percentage for notes receivable.

No definition available.

Name:	pfsi_LoansReceivableFixedInterestRatePercent
Namespace Prefix:	pfsi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the amount of loans receivable maximum commitment amount.

+ References

No definition available.

+ Details

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

- Definition

Represents amounts payable to PennyMac's exchanged unitholders pursuant to an agreement under which an agreed-upon portion of the amount of the benefits, if any, that PFSI is deemed to realize as a result of (i) increases in tax basis of PennyMac's assets resulting from such unitholders' exchanges and (ii) certain other tax benefits related to entering into the tax receivable agreement, including tax benefits attributable to payments under the tax receivable agreement.

+ References

No definition available.

+ Details

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

- Definition

Represent the information pertaining to cash outflow relating to tax liability under the tax receivable agreement.

+ References

No definition available.

+ Details

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

- Definition

Percentage of tax benefits under the tax sharing agreement attributable to exchanged PennyMac unit holders.

+ References

No definition available.

+ Details

Name:	pfsi_PercentageOfAmountOfTaxBenefits
Namespace Prefix:	pfsi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of operating interest income, including, but not limited to, amortization and accretion of premiums and discounts on securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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+ Details

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

- Definition

Description of reference rate used for variable rate of loan receivable.

+ References

No definition available.

+ Details

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

- Definition

The cash outflow for a loan, supported by a promissory note, granted to related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section 45
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
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Period Type:	duration

- Details

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Namespace Prefix:
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- Details

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- Details

Name:	srt_CounterpartyNameAxis=pfsi_TownsgateClosingServicesLlcMember
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Related Party Transactions - Exchanged Private National Mortgage Acceptance Company, LLC Unitholders (Details) - USD ($)		3 Months Ended
	Dec. 27, 2022	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Transactions with Affiliates
Amount of tax benefits under the tax sharing agreement (as a percent)		85.00%
Payable to exchanged PNMAC unitholders under tax receivable agreement		$ 26,100,000		$ 26,100,000
Interest income		156,426,000	$ 128,478,000
Related Party \| Private National Mortgage Acceptance Company
Transactions with Affiliates
Payment of tax liability under the tax receivable agreement to Private National Mortgage Acceptance Company, LLC unitholders		$ 0	0
Related Party \| Townsgate Closing Services, LLC
Transactions with Affiliates
Advances to related party	$ 801,000
Maximum commitment amount	$ 1,500,000
Advances stated percentage		9.75%
Advances variable rate	10+ year USD High Yield Corporate Bond Index
Interest income		$ 20,000	$ 21,000