Transactions with Affiliates - Other Transactions, Conditional Reimbursement (Details) - PMT - Conditional Reimbursement - USD ($)	3 Months Ended
Mar. 31, 2019	Aug. 04, 2009
Conditional reimbursement
Payments received	$ 75,000
Maximum
Conditional reimbursement
Conditional reimbursement		$ 2,900,000

Amount of contingent reimbursement based upon satisfaction of certain performance measures over a specified period of time as per arrangements between the reporting entity and related parties.

No definition available.

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