Fair Value - Level 3 Unobservable Inputs, Mortgage Loans and IRLC (Details) $ in Thousands	Jun. 30, 2024 USD ($) item	Dec. 31, 2023 USD ($) item
Excess servicing spread financing
Loans held for sale	$ 6,238,959	$ 4,420,691
Mortgage loans held for sale \| Level 3
Excess servicing spread financing
Loans held for sale	$ 400,076	$ 478,564
Mortgage loans held for sale \| Discount rate \| Level 3 \| Minimum
Excess servicing spread financing
Input	0.068	0.071
Mortgage loans held for sale \| Discount rate \| Level 3 \| Maximum
Excess servicing spread financing
Input	0.102	0.102
Mortgage loans held for sale \| Discount rate \| Level 3 \| Weighted average
Excess servicing spread financing
Input	0.075	0.072
Mortgage loans held for sale \| Twelve-month projected housing price index Change \| Level 3 \| Minimum
Excess servicing spread financing
Input	0.036	0.003
Mortgage loans held for sale \| Twelve-month projected housing price index Change \| Level 3 \| Maximum
Excess servicing spread financing
Input	0.040	0.005
Mortgage loans held for sale \| Twelve-month projected housing price index Change \| Level 3 \| Weighted average
Excess servicing spread financing
Input	0.037	0.005
Mortgage loans held for sale \| Prepayment/resale speed \| Level 3 \| Minimum
Excess servicing spread financing
Input	0.062	0.040
Mortgage loans held for sale \| Prepayment/resale speed \| Level 3 \| Maximum
Excess servicing spread financing
Input	0.396	0.369
Mortgage loans held for sale \| Prepayment/resale speed \| Level 3 \| Weighted average
Excess servicing spread financing
Input	0.227	0.248
Mortgage loans held for sale \| Total prepayment speed \| Level 3 \| Minimum
Excess servicing spread financing
Input	0.063	0.040
Mortgage loans held for sale \| Total prepayment speed \| Level 3 \| Maximum
Excess servicing spread financing
Input	0.449	0.503
Mortgage loans held for sale \| Total prepayment speed \| Level 3 \| Weighted average
Excess servicing spread financing
Input	0.250	0.322
Interest rate lock commitments \| Level 3
Excess servicing spread financing
Fair Value	$ 68,752	$ 89,593
Committed amount	$ 7,596,114	$ 6,349,628
Interest rate lock commitments \| Pull-through rate \| Level 3 \| Minimum
Excess servicing spread financing
Input	0.148	0.102
Interest rate lock commitments \| Pull-through rate \| Level 3 \| Maximum
Excess servicing spread financing
Input	1	1
Interest rate lock commitments \| Pull-through rate \| Level 3 \| Weighted average
Excess servicing spread financing
Input	0.853	0.811
Interest rate lock commitments \| Mortgage servicing rights value expressed as servicing fee multiple \| Level 3 \| Minimum
Excess servicing spread financing
Input \| item	1.0	1.1
Interest rate lock commitments \| Mortgage servicing rights value expressed as servicing fee multiple \| Level 3 \| Maximum
Excess servicing spread financing
Input \| item	8.2	7.3
Interest rate lock commitments \| Mortgage servicing rights value expressed as servicing fee multiple \| Level 3 \| Weighted average
Excess servicing spread financing
Input \| item	4.9	4.2
Interest rate lock commitments \| Percentage of unpaid principal balance \| Level 3 \| Minimum
Excess servicing spread financing
Input	0.003	0.003
Interest rate lock commitments \| Percentage of unpaid principal balance \| Level 3 \| Maximum
Excess servicing spread financing
Input	0.046	0.043
Interest rate lock commitments \| Percentage of unpaid principal balance \| Level 3 \| Weighted average
Excess servicing spread financing
Input	0.023	0.019

The net fair value portion of mortgage loans held-for-sale.

No definition available.

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

- Definition

Value of input used to measure investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleMeasurementInput
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-1B

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-1A

+ Details

Name:	us-gaap_DerivativeNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
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

No definition available.

+ Details

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

- Definition

Value of input used to measure loan, held for sale.

+ References

+ Details

Name:	us-gaap_LoansHeldForSaleMeasurementInput
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Fair value portion of mortgage loans held-for-sale.

+ References

No definition available.

+ Details

Name:	us-gaap_MortgagesHeldForSaleFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

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

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_WeightedAverageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MeasurementInputTypeAxis=pfsi_MeasurementInputTwelveMonthProjectedHousingPriceIndexChangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MeasurementInputTypeAxis=pfsi_MeasurementInputConstantPrepaymentAndResaleRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputConstantPrepaymentRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_MeasurementInputTypeAxis=pfsi_MeasurementInputPullThroughRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MeasurementInputTypeAxis=pfsi_MeasurementInputMortgageServicingRightsValueExpressedAsServicingFeeMultipleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MeasurementInputTypeAxis=pfsi_MeasurementInputPercentageOfUnpaidPrincipalBalanceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: