Related Party Transactions - Amounts due from Affiliate (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Amounts due from affiliate
Total due from affiliate	$ 30,835	$ 29,262
Payable to affiliate
Other Liabilities, Total	127,993	208,210
Related Party | PennyMac Mortgage Investment Trust
Amounts due from affiliate
Correspondent production fees	7,368	8,288
Allocated expenses and expenses incurred on PMT's behalf	8,194	5,612
Management fees	7,188	7,252
Servicing fees	6,730	6,809
Fulfillment fees	1,355	1,301
Payable to affiliate
Amounts advanced by PMT	127,992	208,154
Other expenses	1	56
Affiliated entities | PennyMac Mortgage Investment Trust
Amounts due from affiliate
Total due from affiliate	30,835	29,262
Payable to affiliate
Other Liabilities, Total	$ 127,993	$ 208,210