Related Party Transactions - Other Transactions, Reimbursement of Common Overhead Expenses (Details) - Related Party - PennyMac Mortgage Investment Trust - USD ($)		3 Months Ended		6 Months Ended
	Sep. 12, 2016	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
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		$ 7,573,000	$ 4,944,000	$ 14,784,000	$ 13,467,000
Payments and settlements during the period		32,628,000	29,263,000	60,676,000	59,348,000
Common overhead incurred
Reimbursement of common overhead and expenses incurred on behalf of affiliates
Reimbursement of common overhead and expenses incurred by the Company		982,000	2,000,000	1,963,000	3,944,000
Compensation
Reimbursement of common overhead and expenses incurred on behalf of affiliates
Reimbursement of common overhead and expenses incurred by the Company		1,628,000	165,000	3,257,000	330,000
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		$ 4,963,000	$ 2,779,000	$ 9,564,000	$ 9,193,000