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Related Party Transactions - Investing Activities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Activity during the period:      
Interest income $ 53,882 $ 82,081  
Activity during the period:      
Balance at end of period 2 401  
Fair value of PennyMac Mortgage Investment Trust shares $ 1,267   $ 1,300
PennyMac Mortgage Investment Trust      
Transactions with Affiliates      
Common shares of beneficial interest owned 75,000    
Value of beneficial interest owned $ 1,300   $ 1,300
Activity during the period:      
Interest income   387  
PennyMac Mortgage Investment Trust | PennyMac Holdings, L L C Repurchase Agreement      
Activity during the period:      
Interest income   387  
Activity during the period:      
Change in fair value of investment in Common shares of PennyMac Mortgage Investment Trust $ 2 $ 401