Related Party Transactions - Mortgage Loan Servicing (Details) - USD ($)		3 Months Ended		9 Months Ended
	Sep. 12, 2016	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
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	7.50
Base servicing fees per month for adjustable rate non-distressed loans subserviced	8.50
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
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
Additional servicing fee amount per month for delinquent loans	$ 55
PennyMac Mortgage Investment Trust
Summary of mortgage loan servicing fees earned
Loan servicing fees		$ 20,247,000	$ 20,703,000	$ 61,670,000	$ 59,811,000
PennyMac Mortgage Investment Trust | Loans acquired for sale at fair value
Summary of mortgage loan servicing fees earned
Loan servicing fees		258,000	698,000	780,000	1,871,000
PennyMac Mortgage Investment Trust | Loans at fair value
Summary of mortgage loan servicing fees earned
Loan servicing fees		111,000	89,000	427,000	306,000
PennyMac Mortgage Investment Trust | Mortgage servicing rights
Summary of mortgage loan servicing fees earned
Loan servicing fees		$ 19,878,000	$ 19,916,000	$ 60,463,000	$ 57,634,000