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Fair Value Measurements - Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Allowance for Loan and Lease Losses [Roll Forward]    
Beginning balance $ 757  
Cumulative effect adjustment upon adoption of ASU 2016-13, Credit Losses   $ 575
Provision for credit loss expense 46 228
Ending balance $ 803 $ 803