Related Party Transactions - Correspondent Production (Details) - USD ($)				3 Months Ended
	Jul. 01, 2020	Jun. 30, 2020	Sep. 12, 2016	Mar. 31, 2021	Mar. 31, 2020
Ginnie Mae Mortgage Backed Securities Guide Loan
Transactions with Affiliates
Threshold limit of loan commitment	$ 16,500
Maximum Multiplier factor for each pull through adjusted loan commitment	585
Multiplying factor for each pull through adjusted loan commitment in excess of threshold limit per quarter	355
Multiplying factor for number of purchased loans	315
Multiplying factor for number of purchased loans in excess of threshold limit per quarter	$ 195
Ginnie Mae Mortgage Backed Securities Guide Loan | Minimum
Transactions with Affiliates
Pull through factor as a percentage	80.00%
Ginnie Mae Mortgage Backed Securities Guide Loan | Maximum
Transactions with Affiliates
Pull through factor as a percentage	99.00%
Other mortgage loans
Transactions with Affiliates
Multiplying factor for number of purchased loans	$ 750
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
Target recapture rate	15.00%
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%
Related party transaction, renewal period		5 years
MSR Recapture Agreement | First 15%
Transactions with Affiliates
Percentage of fair market value.	40.00%
Percentage of recapture rate.	15.00%
MSR Recapture Agreement | In excess of 15% and upto 30%
Transactions with Affiliates
Percentage of fair market value.	35.00%
MSR Recapture Agreement | In excess of 30%
Transactions with Affiliates
Percentage of fair market value.	30.00%
Percentage of recapture rate.	30.00%
MSR Recapture Agreement | Minimum | In excess of 15% and upto 30%
Transactions with Affiliates
Percentage of recapture rate.	15.00%
MSR Recapture Agreement | Maximum | In excess of 15% and upto 30%
Transactions with Affiliates
Percentage of recapture rate.	30.00%
PMT
Lending activity between the entity and affiliate
Total of gain on sale of loans and MSR recapture				$ (14,248,000)	$ 77,916,000
Sale of loans held for sale to PMT					2,246,127,000
Fulfillment fee revenue				60,835,000	41,940,000
Proceeds from sale of mortgage loans held for sale to PennyMac Mortgage Investment Trust					2,246,127,000
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					81,224,000
Mortgage servicing rights and excess servicing spread recapture incurred				(14,248,000)	(3,308,000)
Total of gain on sale of loans and MSR recapture				(14,248,000)	77,916,000
Sale of loans held for sale to PMT					2,246,127,000
Tax service fee				8,192,000	3,980,000
Fulfillment fee revenue				60,835,000	41,940,000
Sourcing fees paid				1,738,000	4,161,000
Unpaid principal balance of loans purchased from PMT				$ 17,559,575,000	13,870,280,000
Proceeds from sale of mortgage loans held for sale to PennyMac Mortgage Investment Trust					$ 2,246,127,000
PLS | Minimum
Transactions with Affiliates
Sourcing fees (as a percent)	0.01%
PLS | Maximum
Transactions with Affiliates
Sourcing fees (as a percent)	0.02%
PLS | Ginnie Mae Mortgage Backed Securities Guide Loan
Transactions with Affiliates
Fulfilment fee payable	$ 0