Related Party Transactions - Investing Activities (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Activity during the period:
Change in fair value of investment in and dividends received from PennyMac Mortgage Investment Trust	$ (15)	$ 68	$ 65	$ 38
Fair value of PennyMac Mortgage Investment Trust shares	920		920		$ 944
Related Party | PennyMac Mortgage Investment Trust
Transactions with Affiliates
Common shares of beneficial interest owned	920		920		$ 944
Activity during the period:
Change in fair value of investment in and dividends received from PennyMac Mortgage Investment Trust	(15)	68	65	38
Sale of MSRs at fair value to PMT	$ 1,895		$ 1,895
Common shares of beneficial interest owned	75		75		75
Related Party | Mortgage Lending | PennyMac Mortgage Investment Trust
Activity during the period:
Sale of loans held for sale to PMT	$ 3,983,322	$ 191,250	$ 5,673,014	$ 191,250