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Stock Based Compensation, Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Period options granted to date vest ratably     5 years  
Period options granted expires after date of grant     10 years  
Compensation expense relating to restricted stock     $ 71,000 $ 63,000
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Aggregate intrinsic value for option outstanding $ 149,000 $ 174,000 149,000 174,000
Aggregate intrinsic value of options exercisable 149,000 174,000 149,000 174,000
Total expense related to options included in salaries and wages       1,000
Tax benefit from compensation expense       0
Restricted Stock Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense relating to restricted stock 15,000 7,000 71,000 63,000
Tax benefit from compensation expense 3,000 $ 3,000 15,000 $ 22,000
Restricted stock compensation costs not yet recognized $ 217,000   $ 217,000  
Compensation costs not yet recognized, period for recognition     4 years  
Ownership Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized for issuance (in shares) 200,000   200,000  
2015 Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized for issuance (in shares) 450,000   450,000