Related Party Transactions - Other Transactions, Reimbursement of Common Overhead Expenses (Details) - Related Party - PennyMac Mortgage Investment Trust - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Reimbursement of common overhead and expenses incurred on behalf of affiliates
Reimbursement of common overhead and expenses incurred by the Company	$ 9,878	$ 7,573	$ 18,567	$ 14,784
Payments and settlements during the period	13,014	32,628	31,344	60,676
Common overhead incurred
Reimbursement of common overhead and expenses incurred on behalf of affiliates
Reimbursement of common overhead and expenses incurred by the Company	4,022	982	4,971	1,963
Compensation
Reimbursement of common overhead and expenses incurred on behalf of affiliates
Reimbursement of common overhead and expenses incurred by the Company	1,599	1,628	3,198	3,257
Expenses incurred by related party (reporting entity), net
Reimbursement of common overhead and expenses incurred on behalf of affiliates
Reimbursement of common overhead and expenses incurred by the Company	$ 4,257	$ 4,963	$ 10,398	$ 9,564