Related Party Transactions - Amounts due from Affiliate (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Amounts due from affiliate
Total due from affiliate	$ 27,613	$ 36,372
Payable to affiliate
Other Liabilities, Total	97,975	205,011
Related Party | PennyMac Mortgage Investment Trust
Amounts due from affiliate
Correspondent production fees	9,183	6,835
Allocated expenses and expenses incurred on PMT's behalf	2,672	11,447
Management fees	7,175	7,307
Servicing fees	6,760	6,740
Fulfillment fees	1,823	4,043
Payable to affiliate
Amounts advanced by PMT	95,723	201,451
Other expenses	2,252	3,560
Affiliated entities | PennyMac Mortgage Investment Trust
Amounts due from affiliate
Total due from affiliate	27,613	36,372
Payable to affiliate
Other Liabilities, Total	$ 97,975	$ 205,011