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Stock Based Compensation - Additional Information (Details) - USD ($)
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
May 15, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum number of common stock authorizes for issuance (in shares)     675,000  
Unrecognized compensation expense $ 0      
Regular quarterly board retainer if restricted stock vested 7,500      
Monthly meeting fees a director could receive in cash 725      
Monthly meeting fees a director could receive if restricted stock vested $ 900      
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum vesting period of granted restricted stock 36 months      
Unrecognized compensation expense $ 820,000     $ 538,000
Weighted average period for recognition of unrecognized compensation cost 1 year 2 months 26 days      
Share based compensation expense $ 437,000 $ 418,000    
Number of shares issued (in shares) 10,865 9,891    
Recognized share based compensation expense $ 422,000 $ 357,000    
Restricted Stock | Vesting 2018        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of remainder of restricted stock vesting each year 33.33%      
Restricted Stock | Vesting 2019        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of remainder of restricted stock vesting each year 33.33%      
Restricted Stock | Vesting 2020        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of remainder of restricted stock vesting each year 33.33%