Related Party Transactions - Investing Activities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Activity during the period:
Interest income	$ 172,952	$ 49,864	$ 301,430	$ 103,746
Interest	172,952	49,864	301,430	103,746
Activity during the period:
Balance at end of period	116	(194)	142	(192)
Fair value of PennyMac Mortgage Investment Trust shares	$ 1,011		$ 1,011		$ 929
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	$ 1,011		$ 1,011		$ 929
Activity during the period:
Common shares of beneficial interest owned	75,000		75,000		75,000
Related Party | PennyMac Holdings, L L C Repurchase Agreement | PennyMac Mortgage Investment Trust
Activity during the period:
Change in fair value of investment in Common shares of PennyMac Mortgage Investment Trust	$ 116	$ (194)	$ 142	$ (192)