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Stock Based Compensation, Additional Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 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 $ 70,000 $ 56,000
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 68,593,000 137,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value 68,593,000 137,000,000
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Allocated Share-based Compensation Expense 70,000 56,000
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense 15,000 $ 12,000
Restricted stock compensation costs not yet recognized $ 323,000  
Compensation costs not yet recognized, period for recognition 5 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  
2015 Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares authorized for issuance (in shares) 450,000