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Stock Based Compensation (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares authorized         3,000,000  
Tax benefit recorded to additional paid in capital     $ 136,000 $ 16,000    
Weighted Average Grant Date Fair Value of Restricted Stock            
Shares Paid for Tax Withholding for Share Based Compensation     19,533 10,590    
Forfeiture Rate, Minimum     3.50%      
Forfeiture Rate, Maximum     6.50%      
Restricted Stock [Member]            
Restricted Stock Rollforward, Shares            
Unvested balance at December 31, 2016     158,261      
Granted     84,643      
Vested     (95,717)      
Forfeited     0      
Unvested balance at Period End 147,187   147,187      
Weighted Average Grant Date Fair Value of Restricted Stock            
Unvested balance at December 31, 2016, USD per share $ 16.84   $ 16.84   $ 16.84 $ 14.55
Granted, USD per share     19.17      
Vested, USD per share     15.12      
Forfeited, USD per share     0.00      
Unvested balance at Period End, USD per share $ 16.84   $ 16.84      
Unrecognized compensation expense   $ 2,090,000   $ 2,090,000 $ 2,142,000  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 1 year 8 months          
Restricted Stock [Member] | Selling, General and Administrative Expenses [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Compensation costs $ 526,000 $ 407,000 $ 791,000 $ 582,000