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Employee Benefit Plans - 401(K) Saving And Retirement Plan (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Non Employee Director      
Non-Employee Benefit Plan Compensation      
Granted (in shares) 36,175 114,285 107,389
Compensation cost $ 228 $ 243 $ 261
Savings And Retirement Plan 401 K      
401(K) Savings & Retirement Plan      
Percent of salary employee is permitted to contribute 100.00%    
Vesting period 3 years    
Common stock, shares issued 403,474 841,539  
Total expense (including issuance of shares) $ 2,600 $ 1,900 $ 1,800