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

No definition available.

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

- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

+ Details

Name:	us-gaap_DividendsPayableAmountPerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ 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),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

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

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

- Details

Name:	dei_LegalEntityAxis=pfsi_PennyMacLoanServicesLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=pfsi_CreditSuisseFirstBostonMortgageCapitalLLCMember
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_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=pfsi_FannieMaeFreddieMacMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=pfsi_GovernmentNationalMortgageAssociationIssuerPLSMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions	May 07, 2020	Apr. 24, 2020	Mar. 31, 2020
PLS \| Credit Suisse First Boston Mortgage Capital LLC
Securities Sold under Agreements to Repurchase [Abstract]
Maximum aggregate purchase price			$ 2,000
PLS \| Credit Suisse First Boston Mortgage Capital LLC \| Note Payable
Subsequent Event
Maximum loan amount			$ 400
Subsequent Event
Subsequent Event
Dividends declared (in dollars per share)	$ 0.12
Subsequent Event \| Credit Suisse First Boston Mortgage Capital LLC \| Fannie Mae / Freddie Mac - PLS
Securities Sold under Agreements to Repurchase [Abstract]
Maximum aggregate purchase price		$ 400
Subsequent Event \| PLS \| Credit Suisse First Boston Mortgage Capital LLC
Securities Sold under Agreements to Repurchase [Abstract]
Maximum aggregate purchase price		2,250
Subsequent Event \| PLS \| Credit Suisse First Boston Mortgage Capital LLC \| Note Payable
Subsequent Event
Maximum loan amount		600
Subsequent Event \| PLS \| Ginnie Mae - PLS \| Credit Suisse First Boston Mortgage Capital LLC
Securities Sold under Agreements to Repurchase [Abstract]
Maximum aggregate purchase price		$ 1,500