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Related Party Transactions - Investing Activities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Activity during the period:          
Interest income $ 82,994 $ 68,312 $ 186,740 $ 231,190  
Activity during the period:          
Balance at end of period (119) (67) (311) 478  
Fair value of PennyMac Mortgage Investment Trust shares $ 884   $ 884   $ 1,300
PennyMac Mortgage Investment Trust          
Transactions with Affiliates          
Common shares of beneficial interest owned 75,000   75,000   75,000
Common shares of beneficial interest owned $ 884   $ 884   $ 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 $ (119) $ (67) $ (311) $ 478