Related Party Transactions - Investing Activities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Activity during the period:
Change in fair value of investment in and dividends received from PennyMac Mortgage Investment Trust	$ 68	$ (51)	$ 38	$ 91
Related Party | PennyMac Mortgage Investment Trust
Transactions with Affiliates
Common shares of beneficial interest owned	75,000		75,000		75,000
Common shares of beneficial interest owned	$ 1,070		$ 1,070		$ 1,121
Activity during the period:
Change in fair value of investment in and dividends received from PennyMac Mortgage Investment Trust	$ 68	$ (51)	$ 38	$ 91