Related Party Transactions - Mortgage Loan Servicing (Details) - USD ($)			3 Months Ended		6 Months Ended
	Jan. 01, 2025	Sep. 12, 2016	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Summary of mortgage loan servicing fees earned
Servicing fees			$ 506,667,000	$ 440,696,000	$ 995,135,000	$ 864,880,000
Loan Servicing Agreement
Transactions with Affiliates
Base servicing fees per month for REO		$ 75
Base servicing fees per month for fixed-rate non-distressed loans subserviced		7.5
Base servicing fees per month for adjustable rate non-distressed loans subserviced		8.5
Supplemental fee per month for each distressed whole loan		25
Minimum | Loan Servicing Agreement
Transactions with Affiliates
Servicing fees amount per month for current loans		30
Servicing fees amount per month for severely delinquent loans	$ 18
Additional servicing fee amount per month for delinquent loans		10
Maximum | Loan Servicing Agreement
Transactions with Affiliates
Servicing fees amount per month for current loans		95
Servicing fees amount per month for severely delinquent loans	$ 80
Additional servicing fee amount per month for delinquent loans		$ 55
Related Party | PennyMac Mortgage Investment Trust
Summary of mortgage loan servicing fees earned
Servicing fees			21,645,000	20,264,000	43,374,000	40,526,000
Related Party | Loans acquired for sale at fair value | PennyMac Mortgage Investment Trust
Summary of mortgage loan servicing fees earned
Base and supplemental			19,151,000	19,181,000	38,354,000	38,378,000
Activity-based			2,494,000	1,083,000	5,020,000	2,148,000
Servicing fees			$ 21,645,000	$ 20,264,000	$ 43,374,000	$ 40,526,000