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Employee Benefit Plans - Changes in Deferred Compensation Plan (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Retirement Benefits [Abstract]      
Balance outstanding at the beginning of the year $ 4,244 $ 3,654 $ 2,844
Employer contributions 207 443 713
Interest credited 128 147 97
Deferred Compensation Arrangement with Individual, Distribution Paid (478) 0 0
Balance outstanding at the end of the year $ 4,101 $ 4,244 $ 3,654