Transactions with Affiliates - Correspondent Production (Details) - USD ($) $ in Thousands		3 Months Ended
	Sep. 12, 2016	Mar. 31, 2020	Mar. 31, 2019
MBS Agreement
Transactions with Affiliates
The administrative fee plus accrued interest and sourcing fee percent	0.35%
Fulfillment fee as a percent of UPB of all other mortgage loans, excluding Ginnie Mae mortgage loans	0.50%
MSR Recapture Agreement
Transactions with Affiliates
Related party transaction, automatic renewal period	18 months
Lending activity between the entity and affiliate
Minimum percent of total UPB of loans originated from refinancing of loans which a related party previously held the MSR required to be transferred	30.00%
PMT
Lending activity between the entity and affiliate
Total of gain on sale of loans and MSR recapture		$ 77,916	$ 26,023
Sale of loans held for sale to PMT		2,246,127	884,510
Fulfillment fee revenue		41,940	27,574
Proceeds from sale of mortgage loans held for sale to PennyMac Mortgage Investment Trust		2,246,127	884,510
PMT | MBS Agreement | Minimum
Transactions with Affiliates
The administrative fee plus accrued interest and sourcing fee percent	0.02%
PMT | MBS Agreement | Maximum
Transactions with Affiliates
The administrative fee plus accrued interest and sourcing fee percent	0.035%
PMT | Loan Lending
Lending activity between the entity and affiliate
Net gain on loans held for sale to PMT		81,224	27,146
Mortgage servicing rights and excess servicing spread recapture incurred		(3,308)	(1,123)
Total of gain on sale of loans and MSR recapture		77,916	26,023
Sale of loans held for sale to PMT		2,246,127	884,510
Tax service fee		3,980	2,243
Fulfillment fee revenue		41,940	27,574
Unpaid principal balance of loans fulfilled for PMT		16,152,543	8,135,552
Sourcing fees paid		4,161	1,994
Unpaid principal balance of loans purchased from PMT		13,870,280	6,647,338
Proceeds from sale of mortgage loans held for sale to PennyMac Mortgage Investment Trust		$ 2,246,127	$ 884,510