Related Party Transactions - Correspondent Production (Details) - USD ($)		3 Months Ended		9 Months Ended
	Jul. 01, 2020	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Lending activity between the entity and affiliate
Net gains on loans held for sale at fair value		$ (151,374,000)	$ (168,694,000)	$ (397,178,000)	$ (689,720,000)
Sales of loans held for sale to PMT					298,862,000
Fulfillment fee revenue		5,531,000	18,407,000	22,895,000	55,807,000
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
MSR Recapture Agreement
Transactions with Affiliates
Target recapture rate	15.00%
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 15% and upto 30% | Minimum
Transactions with Affiliates
Percentage of recapture rate.	15.00%
MSR Recapture Agreement | In excess of 15% and upto 30% | Maximum
Transactions with Affiliates
Percentage of recapture rate.	30.00%
MSR Recapture Agreement | In excess of 30%
Transactions with Affiliates
Percentage of fair market value.	30.00%
Percentage of recapture rate.	30.00%
Related Party
Lending activity between the entity and affiliate
Net gains on loans held for sale at fair value		500,000	1,648,000	1,494,000	16,052,000
Related Party | PennyMac Mortgage Investment Trust
Lending activity between the entity and affiliate
Net gains on loans held for sale at fair value		500,000	1,648,000	1,494,000	16,052,000
Related Party | Mortgage Lending | PennyMac Mortgage Investment Trust
Lending activity between the entity and affiliate
Net losses on loans sold to PMT (primarily cash)					(2,820,000)
Mortgage servicing rights and excess servicing spread recapture incurred		(500,000)	(1,648,000)	(1,494,000)	(13,232,000)
Net gains on loans held for sale at fair value		500,000	1,648,000	1,494,000	16,052,000
Sales of loans held for sale to PMT					298,862,000
Tax service fee		579,000	2,192,000	2,690,000	6,938,000
Fulfillment fee revenue		5,531,000	18,407,000	22,895,000	55,807,000
Unpaid principal balance of loans fulfilled for PMT		2,760,000,000	10,226,513,000	12,418,084,000	30,319,475,000
Sourcing fees paid		1,854,000	1,203,000	5,014,000	3,562,000
Government guaranteed or insured		8,606,835,000	12,261,222,000	29,127,889,000	35,643,210,000
Conventional conforming		9,932,593,000		21,013,357,000
Unpaid principal balance of loans purchased from PMT		$ 18,539,428,000	$ 12,261,222,000	$ 50,141,246,000	$ 35,643,210,000
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