Mortgage-Backed Securities (Details) $ in Thousands	6 Months Ended
Jun. 30, 2024 USD ($)
Mortgage-backed securities
Fair Value	$ 914,223
Principal-Only-Strip MBS
Mortgage-backed securities
Contractual maturities term	10 years
Principal Balance	$ 1,144,548
Unearned discounts	(213,554)
Cumulative valuation changes	(16,771)
Fair Value	$ 914,223

Amount of mortgage-backed asset securities measured at fair value pledged to creditors.

No definition available.

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

- Definition

Contractual term of mortgage backed asset securities.

+ References

No definition available.

+ Details

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

- Definition

Amount of gain (loss) from change in value of mortgage-backed asset securities.

+ References

No definition available.

+ Details

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

- Definition

Principal amount of investment mortgage-backed asset securities.

+ References

No definition available.

+ Details

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

- Definition

An unearned discount is interest or a charge that a lending institution has received on a mortgage but has not yet been counted as profits (or earnings).

+ References

No definition available.

+ Details

Name:	pfsi_MortgageBackedAssetSecuritiesUnearnedDiscounts
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/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

+ Details

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

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_PrincipalOnlyStripMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: