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Servicing Assets - Activity for Servicing Assets and Related Changes in Fair Value (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Transfers And Servicing [Abstract]      
Beginning balance $ 19,693 $ 21,400 $ 21,091
Additions, net 6,417 7,562 6,250
Changes in fair value (6,639) (9,269) (5,941)
Ending balance $ 19,471 $ 19,693 $ 21,400