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Transactions with Related Parties - Mortgage Loan Servicing (Details) - USD ($)
1 Months Ended 12 Months Ended
Sep. 12, 2016
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Summary of mortgage loan servicing fees earned          
Loan servicing fees     $ 1,799,480,000 $ 1,484,946,000 $ 1,228,637,000
Loan Servicing Agreement          
Transactions with Affiliates          
Base servicing fees per month for REO $ 75        
Base servicing fees per month for fixed-rate non-distressed loans subserviced 7.5        
Base servicing fees per month for adjustable rate non-distressed loans subserviced 8.5        
Supplemental fee per month for each distressed whole loan 25        
Minimum | Loan Servicing Agreement          
Transactions with Affiliates          
Servicing fees amount per month for current loans 30        
Servicing fees amount per month for severely delinquent loans   $ 18      
Additional servicing fee amount per month for delinquent loans 10        
Maximum | Loan Servicing Agreement          
Transactions with Affiliates          
Servicing fees amount per month for current loans 95        
Servicing fees amount per month for severely delinquent loans   $ 80      
Additional servicing fee amount per month for delinquent loans $ 55        
Related Party | PennyMac Mortgage Investment Trust          
Summary of mortgage loan servicing fees earned          
Loan servicing fees     83,252,000 81,347,000 81,915,000
Related Party | Loans acquired for sale at fair value | PennyMac Mortgage Investment Trust          
Summary of mortgage loan servicing fees earned          
Loan servicing fees     83,173,000 81,139,000 81,386,000
Related Party | Distressed loans | PennyMac Mortgage Investment Trust          
Summary of mortgage loan servicing fees earned          
Loan servicing fees     $ 79,000 $ 208,000 $ 529,000