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Stock Based Compensation, Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
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 $ 21,000 $ 18,000 $ 112,000 $ 89,000
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value 76,000 131,000 76,000 131,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value 76,000 131,000 76,000 131,000
Allocated Share-based Compensation Expense     0 0
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense 21,000 18,000 112,000 89,000
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense 5,000 $ 4,000 24,000 $ 19,000
Restricted stock compensation costs not yet recognized $ 281,000   $ 281,000  
Compensation costs not yet recognized, period for recognition     4 years 6 months  
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