Related Party Transactions - Other Transactions, Reimbursement of Common Overhead Expenses (Details) - Related Party - PennyMac Mortgage Investment Trust - USD ($)		3 Months Ended		9 Months Ended
	Sep. 12, 2016	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Transactions with Affiliates
Expense reimbursement amount, per quarter, relating to personnel	$ 165,000
Reimbursement of common overhead and expenses incurred on behalf of affiliates
Reimbursement of common overhead and expenses incurred by the Company		$ 8,350,000	$ 7,547,000	$ 21,817,000	$ 21,477,000
Payments and settlements during the period		31,752,000	9,190,000	91,100,000	72,446,000
Common overhead incurred
Reimbursement of common overhead and expenses incurred on behalf of affiliates
Reimbursement of common overhead and expenses incurred by the Company		1,867,000	1,489,000	5,811,000	5,450,000
Compensation
Reimbursement of common overhead and expenses incurred on behalf of affiliates
Reimbursement of common overhead and expenses incurred by the Company		165,000	165,000	495,000	495,000
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		$ 6,318,000	$ 5,893,000	$ 15,511,000	$ 15,532,000