Represents the average shareholders equity used to calculate base management fees.

No definition available.

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

- Definition

Base revenues, as contractually stipulated, for operating and managing another entity's business during the reporting period.

+ References

No definition available.

+ Details

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

- Definition

Revenues, comprised of base and incentive revenue derived from the management of joint ventures, managing third-party properties, or another entity's operations.

+ References

No definition available.

+ Details

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

- Definition

Not available.

+ References

No definition available.

+ Details

Name:	pfsi_ManagementFeeRevenueAbstract
Namespace Prefix:	pfsi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Related Party Transaction High Watermark for Performance Incentive Fee Computation

+ References

No definition available.

+ Details

Name:	pfsi_RelatedPartyTransactionHighWatermarkForPerformanceIncentiveFeeComputation
Namespace Prefix:	pfsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Related Party Transaction, Percentage of Affiliate Equity Considered to Calculate Base Management Fee

+ References

No definition available.

+ Details

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

- Definition

Related Party Transaction Percentage of Change in Net Income (Loss) for Performance Incentive Fee Computation

+ References

No definition available.

+ Details

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

- Definition

Related Party Transaction, Percentage of Performance Incentive Fee Payable by Issuance of Common Shares

+ References

No definition available.

+ Details

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

- Definition

Related Party Transaction, Percentage of Return on Affiliate Equity Considered to Calculate Performance Incentive Fee

+ References

No definition available.

+ Details

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

- Definition

Related Party Transaction, Specified Percentage Applied on Excess of Core Earnings on Rolling Quarter Basis before Incentive Fee over Hurdle Rate for Performance Incentive Fee Computation

+ References

No definition available.

+ Details

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

- Definition

Related Party Transaction, Threshold Shareholders Equity Considered to Calculate Base Management Fee

+ References

No definition available.

+ Details

Name:	pfsi_RelatedPartyTransactionThresholdShareholdersEquityConsideredToCalculateBaseManagementFee
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/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-3

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(k)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(k)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-13

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(i))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(ii))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(g)(3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

+ Details

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

- Details

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

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=pfsi_ManagementFeesAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=pfsi_PennyMacMortgageInvestmentTrustMember
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_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=pfsi_BaseManagementFeeCalculationTrancheOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=pfsi_BaseManagementFeeCalculationTrancheTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=pfsi_BaseManagementFeeCalculationTrancheThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=pfsi_PerformanceIncentiveFeeCalculationTrancheOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=pfsi_PerformanceIncentiveFeeCalculationTrancheTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=pfsi_PerformanceIncentiveFeeCalculationTrancheThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Related Party Transactions - Management Fees (Details) - USD ($)		3 Months Ended		6 Months Ended
	Sep. 12, 2016	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Management fees, net:
Management fees		$ 6,869,000	$ 7,133,000	$ 13,881,000	$ 14,321,000
Related Party \| Management Fees \| PennyMac Mortgage Investment Trust
Transactions with Affiliates
Percentage of change in net income due to quarterly adjustments	8.00%
Management fees, net:
Base management fees		6,869,000	7,133,000	13,881,000	14,321,000
Management fees		6,869,000	7,133,000	13,881,000	14,321,000
Average PMT's shareholders' equity used to calculate base management fees		$ 1,836,690,000	$ 1,912,522,000	$ 1,866,238,000	$ 1,919,962,000
Related Party \| Management Fees \| Maximum \| PennyMac Mortgage Investment Trust
Transactions with Affiliates
Percentage of performance incentive fee payable by issuance of common shares	50.00%
Related Party \| Management Fees \| Minimum \| PennyMac Mortgage Investment Trust
Transactions with Affiliates
High watermark	$ 0
Related Party \| Shareholders Equity Up To 2 Billion Dollars \| Maximum \| PennyMac Mortgage Investment Trust
Transactions with Affiliates
Base management fee annual rate (as a percent)	1.50%
Base management fee shareholders' equity limit	$ 2,000,000,000
Related Party \| Shareholders Equity In Excess Of 2 Billion Dollars And Upto 5 Billion Dollars \| PennyMac Mortgage Investment Trust
Transactions with Affiliates
Base management fee annual rate (as a percent)	1.375%
Related Party \| Shareholders Equity In Excess Of 2 Billion Dollars And Upto 5 Billion Dollars \| Maximum \| PennyMac Mortgage Investment Trust
Transactions with Affiliates
Base management fee shareholders' equity limit	$ 5,000,000,000
Related Party \| Shareholders Equity In Excess Of 2 Billion Dollars And Upto 5 Billion Dollars \| Minimum \| PennyMac Mortgage Investment Trust
Transactions with Affiliates
Base management fee shareholders' equity limit	$ 2,000,000,000
Related Party \| Shareholders Equity In Excess Of 5 Billion Dollars \| PennyMac Mortgage Investment Trust
Transactions with Affiliates
Base management fee annual rate (as a percent)	1.25%
Related Party \| Shareholders Equity In Excess Of 5 Billion Dollars \| Maximum \| PennyMac Mortgage Investment Trust
Transactions with Affiliates
Base management fee shareholders' equity limit	$ 5,000,000,000
Related Party \| Return on Shareholders Equity 8 Percent \| PennyMac Mortgage Investment Trust
Transactions with Affiliates
Percentage of net income for calculation of performance incentive fees	10.00%
Related Party \| Return on Shareholders Equity 8 Percent \| Maximum \| PennyMac Mortgage Investment Trust
Transactions with Affiliates
Percentage of return on affiliate's equity	12.00%
Related Party \| Return on Shareholders Equity 8 Percent \| Minimum \| PennyMac Mortgage Investment Trust
Transactions with Affiliates
Percentage of return on affiliate's equity	8.00%
Related Party \| Return on Shareholders Equity 12 Percent \| PennyMac Mortgage Investment Trust
Transactions with Affiliates
Percentage of net income for calculation of performance incentive fees	15.00%
Related Party \| Return on Shareholders Equity 12 Percent \| Maximum \| PennyMac Mortgage Investment Trust
Transactions with Affiliates
Percentage of return on affiliate's equity	16.00%
Related Party \| Return on Shareholders Equity 12 Percent \| Minimum \| PennyMac Mortgage Investment Trust
Transactions with Affiliates
Percentage of return on affiliate's equity	12.00%
Related Party \| Return on Shareholders Equity in Excess of 16 Percent \| PennyMac Mortgage Investment Trust
Transactions with Affiliates
Percentage of net income for calculation of performance incentive fees	20.00%
Percentage of return on affiliate's equity	16.00%