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Employee Benefit Plans - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options granted (in shares) 151,500 96,000 203,000
Defined contribution plan, maximum annual contributions per employee, percent 80.00%    
Employer, contribution $ 675 $ 648 $ 601
Deferred fees 591 379 297
Interest paid on deferred fees 132 107 67
Deferred compensation arrangement with individual, distributions paid $ 14 $ 14 $ 14
Director      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Deferred compensation arrangement, option to elect to defer fees and bonuses, percentage 100.00%    
Executive Management      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Deferred compensation arrangement, option to elect to defer fees and bonuses, percentage 100.00%    
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Award expiration period 10 years    
Options granted (in shares) 151,500 96,000 203,000
Compensation cost not yet recognized $ 839    
Compensation cost not yet recognized, weighted average period 1 year 8 months 12 days    
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 4 years    
Granted (in shares) 27,250 46,050 47,550
Compensation cost not yet recognized $ 1,000    
Compensation cost not yet recognized, weighted average period 2 years 3 months 18 days    
Other Postretirement Benefits Plan | Executive Management      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting rights, percentage 100.00%    
Accrued employee benefits $ 86 $ 115 $ 88
Life settlement contracts, fair value 250    
Life settlement contracts, expense $ 5 $ 5 $ 18
2019 Equity Compensation Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized (in shares) 500,000    
Number of shares available for grant (in shares) 264,350    
2019 Equity Compensation Plan | Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options granted (in shares) 192,500    
Granted (in shares) 43,150