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Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Allowance for credit losses      
Balance at Beginning of Period $ 5,000 $ 5,000 $ 5,000
Balance at End of Period $ 5,000 5,000 5,000
Cumulative Effect of Adoption Adjustment | ASU 2016-13      
Allowance for credit losses      
Balance at Beginning of Period   $ 5,000 5,000
Balance at End of Period     $ 5,000