N/A

No definition available.

Name:	pfsi_LateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssetsAbstract
Namespace Prefix:	pfsi_
Data Type:	xbrli:stringItemType
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- Definition

Amount of revenue from servicing real estate mortgages, and other financial assets held by others. Includes premiums received in lieu of regular servicing fee and fair value changes and hedging results relating to mortgage servicing rights and excess servicing spread payable to PMT.

+ References

No definition available.

+ Details

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

- Definition

All amounts that are due to the servicer of a financial asset, excluding contractually specified servicing fees and late fees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122596-111746

+ Details

Name:	us-gaap_AncillaryFeeIncomeGeneratedByServicingFinancialAssetsAmount
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

All amounts that, per contract, are due to the servicer in exchange for servicing the financial asset and would no longer be received by a servicer if the beneficial owners of the serviced assets (or their trustees or agents) were to exercise their actual or potential authority under the contract to shift the servicing to another servicer. Depending on the servicing contract, those fees may include some or all of the difference between the interest rate collected on the asset being serviced and the rate to be paid to the beneficial owners of the asset.

+ References

+ Details

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

- Definition

All amounts that are due to the servicer of a financial asset as a result of the debt holder not meeting the monthly payment terms.

+ References

+ Details

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

- Details

Name:	us-gaap_FinancialInstrumentAxis=pfsi_MortgageServicingRightsMember
Namespace Prefix:
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Balance Type:
Period Type:

Mortgage Servicing Rights and Mortgage Servicing Liabilities - Servicing, Late, Ancillary and Other Fees Relating to MSRs (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Contractual servicing fees									$ 585,101	$ 475,848	$ 385,633
Ancillary and other fees
Other									64,133	58,924	46,910
Bank Servicing Fees	$ 105,212	$ 109,703	$ 113,689	$ 116,789	$ 106,902	$ 78,081	$ 46,913	$ 74,163	445,393	306,059	185,466
Mortgage servicing rights
Contractual servicing fees									585,101	475,848	385,633
Ancillary and other fees
Late charges									27,940	25,097	19,341
Other									6,276	4,603	4,706
Bank Servicing Fees									$ 619,317	$ 505,548	$ 409,680