Related Party Transactions - Amounts due from Affiliate (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Amounts due from affiliate
Total due from affiliate	$ 32,603	$ 29,262
Payable to affiliate
Other Liabilities, Total	81,040	208,210
Related Party | PennyMac Mortgage Investment Trust
Amounts due from affiliate
Servicing fees	8,670	6,809
Correspondent production fees	7,986	8,288
Management fees	7,153	7,252
Allocated expenses and expenses incurred on PMT's behalf	4,788	5,612
Fulfillment fees	4,006	1,301
Payable to affiliate
Amounts advanced by PMT	72,502	208,154
Other expenses	8,538	56
Affiliated entities | PennyMac Mortgage Investment Trust
Amounts due from affiliate
Total due from affiliate	32,603	29,262
Payable to affiliate
Other Liabilities, Total	$ 81,040	$ 208,210