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Related Party Transactions - Investing Activities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Activity during the period:      
Interest income $ 128,478 $ 53,882  
Activity during the period:      
Balance at end of period 26 2  
Fair value of PennyMac Mortgage Investment Trust shares $ 925   $ 929
PennyMac Mortgage Investment Trust      
Transactions with Affiliates      
Common shares of beneficial interest owned 75,000   75,000
Common shares of beneficial interest owned $ 925   $ 929
Activity during the period:      
Interest income 21    
PennyMac Mortgage Investment Trust | PennyMac Holdings, L L C Repurchase Agreement      
Activity during the period:      
Change in fair value of investment in Common shares of PennyMac Mortgage Investment Trust $ 26 $ 2