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Servicing Assets - Activity for Servicing Assets and Related Changes in Fair Value (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Transfers And Servicing [Abstract]        
Beginning balance $ 24,683 $ 18,351 $ 22,042 $ 19,471
Additions, net 1,564 1,794 5,703 4,449
Changes in fair value (2,650) 1,122 (4,148) (2,653)
Ending balance $ 23,597 $ 21,267 $ 23,597 $ 21,267