Long-Term Debt - Obligations Under Capital Lease (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Leases
Average balance	$ 2,791	$ 11,340
Weighted average interest rate	2.15%	2.13%
Total interest expense	$ 15	$ 59
Unpaid principal balance	$ 1,396		$ 3,489
Weighted average interest rate	2.43%		2.11%
Capitalized software pledged to creditors	$ 3,922		$ 4,546
Furniture, fixtures, equipment and building improvements pledged to creditors	3,775		$ 4,116
Maximum
Leases
Maximum daily amount outstanding	$ 3,489	$ 11,864

The average carrying amount of obligations under capital lease.

No definition available.

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

- Definition

The maximum daily amount outstanding under capital lease.

+ References

No definition available.

+ Details

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

- Definition

Amount equal to the present value (the principal) at the beginning of the leases term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

+ References

No definition available.

+ Details

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

- Definition

Aggregate amount of capitalized computer software pledged to creditors.

+ References

No definition available.

+ Details

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

- Definition

Aggregate amount of property, plant, and equipment pledged to creditors.

+ References

No definition available.

+ Details

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

- Definition

Weighted average interest rate of obligations under capital lease.

+ References

No definition available.

+ Details

Name:	pfsi_WeightedAverageInterestRateOfObligationsUnderCapitalLease
Namespace Prefix:	pfsi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Weighted average interest rate of obligations under capital lease, during the period.

+ References

No definition available.

+ Details

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

- Definition

Amount of interest expense on finance lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918638-209977

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
-URI http://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971

+ Details

Name:	us-gaap_FinanceLeaseInterestExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

No definition available.

+ Details

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

- Details

Name:	srt_RangeAxis=srt_MaximumMember
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Balance Type:
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