Transactions with Affiliates - Amounts due from Affiliate (Details) - PennyMac Mortgage Investment Trust - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Amounts due from affiliate
Allocated expenses	$ 15,431	$ 38,142
Correspondent production fees	8,894	13,065
Fulfillment fees		20,873
Management fees	8,918	8,686
Servicing fees	6,848	6,213
Interest on assets purchased under agreements to resell		26
Total due from affiliate	40,091	87,005
Payable to affiliate
Amounts advanced by PMT	212,066	132,154
Other expenses	15,953	8,152
Payable to affiliates	$ 228,019	$ 140,306