Related Party Transactions - Mortgage Loan Servicing (Details) - USD ($)			3 Months Ended
	Jan. 01, 2025	Sep. 12, 2016	Mar. 31, 2025	Mar. 31, 2024
Summary of mortgage loan servicing fees earned
Servicing fees			$ 488,468,000	$ 424,184,000
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			21,729,000	20,262,000
Related Party | Loans acquired for sale at fair value | PennyMac Mortgage Investment Trust
Summary of mortgage loan servicing fees earned
Servicing fees			$ 21,729,000	$ 20,262,000