Transactions with Related Parties - Financing Activities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 19, 2016
Financing activities:
Issuance pursuant to recapture agreement		$ 557,000	$ 2,093,000
Interest Expense	$ 335,427,000	390,699,000	271,551,000
Repayments		134,624,000	32,377,000
Change in fair value		(1,037,000)	24,970,000
PennyMac Mortgage Investment Trust
Financing activities:
Interest Expense		1,280,000	8,418,000
PennyMac Mortgage Investment Trust | 2/1/13 Spread Acquisition Agreement
Financing activities:
Maximum ESS recapture obligation				$ 200,000
Excess servicing spread financing | PennyMac Mortgage Investment Trust
Financing activities:
Balance at the beginning of the year		131,750,000	178,586,000
Issuance pursuant to recapture agreement		557,000	2,093,000
Repayments		(134,624,000)	(32,377,000)
Change in fair value		1,037,000	(24,970,000)
Balance at the end of the year			131,750,000
interest expense		1,280,000	8,418,000
Excess servicing spread recapture recognized		$ 614,000	$ 2,241,000