Transactions with Related Parties - Summary of Correspondent Production Activity (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Related Party Transaction [Line Items]
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure	$ 694,391		$ 694,391		$ 669,018
PennyMac Loan Services, LLC [Member]
Related Party Transaction [Line Items]
Loan fulfillment fees earned by PLS	4,427	$ 5,441	8,443	$ 17,364
UPB of loans fulfilled by PLS	2,229,397	3,029,274	4,001,078	9,658,084
Sourcing fees received from PLS included in Net gains on loans acquired for sale	2,050	1,832	3,655	3,160
UPB of loans sold to PLS	20,507,121	18,325,232	36,553,976	31,601,818
Tax service fees paid to PLS	431	701	790	2,111
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure	281,020		281,020		$ 168,303
PennyMac Loan Services, LLC [Member] | Government Guaranteed Or Insured [Member]
Related Party Transaction [Line Items]
UPB of loans sold to PLS	10,500,415	11,307,342	18,357,340	20,521,054
PennyMac Loan Services, LLC [Member] | Conventional Conforming [Member]
Related Party Transaction [Line Items]
UPB of loans sold to PLS	$ 10,006,706	$ 7,017,890	$ 18,196,636	$ 11,080,764