Related Party Transactions - Amounts due from Affiliate (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Amounts due from affiliate
Total due from affiliate	$ 27,722	$ 40,091
Payable to affiliate
Payable to affiliates	159,468	228,019
PennyMac Mortgage Investment Trust
Amounts due from affiliate
Management fees	8,117	8,918
Servicing fees	7,136	6,848
Correspondent production fees	6,633	8,894
Fulfillment fees	2,472
Allocated expenses	3,364	15,431
Total due from affiliate	27,722	40,091
Payable to affiliate
Amounts advanced by PMT	138,906	212,066
Other expenses	20,562	15,953
Payable to affiliates	$ 159,468	$ 228,019