Related Party Transactions - Management Fees (Details) - USD ($)		3 Months Ended		9 Months Ended
	Sep. 12, 2016	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Management fees, net:
Management fees		$ 6,912,000	$ 7,153,000	$ 20,793,000	$ 21,474,000
Related Party \| Management Fees \| PennyMac Mortgage Investment Trust
Transactions with Affiliates
Percentage of change in net income due to quarterly adjustments	8.00%
Management fees, net:
Base management fees		6,912,000	7,153,000	20,793,000	21,474,000
Management fees		6,912,000	7,153,000	20,793,000	21,474,000
Average PMT's shareholders' equity used to calculate base management fees		$ 1,828,365,000	$ 1,897,006,000	$ 1,853,613,000	$ 1,912,310,000
Related Party \| Management Fees \| Maximum \| PennyMac Mortgage Investment Trust
Transactions with Affiliates
Percentage of performance incentive fee payable by issuance of common shares	50.00%
Related Party \| Management Fees \| Minimum \| PennyMac Mortgage Investment Trust
Transactions with Affiliates
High watermark	$ 0
Related Party \| Shareholders Equity Up To 2 Billion Dollars \| Maximum \| PennyMac Mortgage Investment Trust
Transactions with Affiliates
Base management fee annual rate (as a percent)	1.50%
Base management fee shareholders' equity limit	$ 2,000,000,000
Related Party \| Shareholders Equity In Excess Of 2 Billion Dollars And Upto 5 Billion Dollars \| PennyMac Mortgage Investment Trust
Transactions with Affiliates
Base management fee annual rate (as a percent)	1.375%
Related Party \| Shareholders Equity In Excess Of 2 Billion Dollars And Upto 5 Billion Dollars \| Maximum \| PennyMac Mortgage Investment Trust
Transactions with Affiliates
Base management fee shareholders' equity limit	$ 5,000,000,000
Related Party \| Shareholders Equity In Excess Of 2 Billion Dollars And Upto 5 Billion Dollars \| Minimum \| PennyMac Mortgage Investment Trust
Transactions with Affiliates
Base management fee shareholders' equity limit	$ 2,000,000,000
Related Party \| Shareholders Equity In Excess Of 5 Billion Dollars \| PennyMac Mortgage Investment Trust
Transactions with Affiliates
Base management fee annual rate (as a percent)	1.25%
Related Party \| Shareholders Equity In Excess Of 5 Billion Dollars \| Maximum \| PennyMac Mortgage Investment Trust
Transactions with Affiliates
Base management fee shareholders' equity limit	$ 5,000,000,000
Related Party \| Return on Shareholders Equity 8 Percent \| PennyMac Mortgage Investment Trust
Transactions with Affiliates
Percentage of net income for calculation of performance incentive fees	10.00%
Related Party \| Return on Shareholders Equity 8 Percent \| Maximum \| PennyMac Mortgage Investment Trust
Transactions with Affiliates
Percentage of return on affiliate's equity	12.00%
Related Party \| Return on Shareholders Equity 8 Percent \| Minimum \| PennyMac Mortgage Investment Trust
Transactions with Affiliates
Percentage of return on affiliate's equity	8.00%
Related Party \| Return on Shareholders Equity 12 Percent \| PennyMac Mortgage Investment Trust
Transactions with Affiliates
Percentage of net income for calculation of performance incentive fees	15.00%
Related Party \| Return on Shareholders Equity 12 Percent \| Maximum \| PennyMac Mortgage Investment Trust
Transactions with Affiliates
Percentage of return on affiliate's equity	16.00%
Related Party \| Return on Shareholders Equity 12 Percent \| Minimum \| PennyMac Mortgage Investment Trust
Transactions with Affiliates
Percentage of return on affiliate's equity	12.00%
Related Party \| Return on Shareholders Equity in Excess of 16 Percent \| PennyMac Mortgage Investment Trust
Transactions with Affiliates
Percentage of net income for calculation of performance incentive fees	20.00%
Percentage of return on affiliate's equity	16.00%

PennyMac Financial Services, Inc. 10-Q