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Related Party Transactions - Management Fees (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 12, 2016
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Management Fee Revenue Abstract          
Management fees   $ 7,153,000 $ 7,175,000 $ 21,474,000 $ 21,510,000
Related Party | Management Fees | PennyMac Mortgage Investment Trust          
Transactions with Affiliates          
Percentage of change in net income due to quarterly adjustments 8.00%        
Management Fee Revenue Abstract          
Base management fee   7,153,000 7,175,000 21,474,000 21,510,000
Management fees   $ 7,153,000 $ 7,175,000 $ 21,474,000 $ 21,510,000
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%