Related Party Transactions - Mortgage Loan Servicing (Details) - USD ($)		3 Months Ended		9 Months Ended
	Sep. 12, 2016	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Summary of mortgage loan servicing fees earned
Loan servicing fees		$ 462,037,000	$ 387,934,000	$ 1,326,917,000	$ 1,082,462,000
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	7.50
Base servicing fees per month for adjustable rate non-distressed loans subserviced	8.50
Supplemental fee per month for each distressed whole loan	25
Related party transaction, automatic renewal period				18 months
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
Related Party | PennyMac Mortgage Investment Trust
Summary of mortgage loan servicing fees earned
Loan servicing fees		22,240,000	20,257,000	$ 62,766,000	61,023,000
Related Party | Loans acquired for sale at fair value | PennyMac Mortgage Investment Trust
Summary of mortgage loan servicing fees earned
Loan servicing fees		22,180,000	20,224,000	62,581,000	60,839,000
Related Party | Loans at fair value | PennyMac Mortgage Investment Trust
Summary of mortgage loan servicing fees earned
Loan servicing fees		$ 60,000	$ 33,000	$ 185,000	$ 184,000