Related Party Transactions - Amounts due from Affiliate (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Amounts due from affiliate
Total due from affiliate	$ 32,306	$ 40,091
Payable to affiliate
Payable to affiliates	87,978	228,019
PennyMac Mortgage Investment Trust
Amounts due from affiliate
Management fees	7,731	8,918
Correspondent production fees	6,812	8,894
Servicing fees	6,711	6,848
Allocated expenses	5,571	15,431
Fulfillment fees	5,481
Total due from affiliate	32,306	40,091
Payable to affiliate
Amounts advanced by PMT	84,418	212,066
Other expenses	3,560	15,953
Payable to affiliates	$ 87,978	$ 228,019