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Stock Incentive Plan And Employee Stock Purchase Plan(Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 81 Months Ended
Dec. 31, 2016
shares
Jan. 31, 2014
shares
Feb. 28, 2013
shares
Feb. 29, 2012
shares
Jun. 30, 2017
USD ($)
shares
Jun. 30, 2016
USD ($)
shares
Jun. 30, 2017
USD ($)
item
shares
Jun. 30, 2016
USD ($)
shares
Dec. 31, 2016
$ / shares
Dec. 31, 2015
shares
Dec. 31, 2014
$ / shares
Dec. 31, 2013
$ / shares
Dec. 31, 2012
$ / shares
Jun. 30, 2017
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Stock option compensation expense | $             $ 51 $ 37            
Shares issued under employee stock purchase plan, shares             1,830              
Stock Options [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Stock options granted 4,227 29,663 29,742 52,611           0        
Stock compensation expense | $         $ 1 $ 6 $ 3 $ 15            
Unrecognized compensation cost | $         $ 11   $ 11             $ 11
Unrecognized compensation cost, recognition period             2 years 5 months 19 days              
Dividend yield                 1.03%   0.00% 0.00% 0.00%  
Risk free interest rate                 2.35%   2.30% 1.34% 1.43%  
Expected life, in years                 6 years   6 years 6 years 7 years 6 months  
Expected volatility                 25.58%   28.93% 28.79% 31.10%  
Weighted average fair value of options granted, per share | $ / shares                 $ 3.28   $ 2.46 $ 2.14 $ 2.56  
Restricted Stock [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Awards granted         0 0 5,156 5,934           90,135
Restricted stock awards compensation expense | $         $ 24 $ 10 $ 48 $ 22            
Minimum [Member] | Restricted Stock [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Award vesting period             3 years              
Maximum [Member] | Restricted Stock [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Award vesting period             9 years              
Stock Incentive Plan [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Award vesting period             10 years              
Number of shares authorized         500,000   500,000             500,000
Shares available for issuance         293,622   293,622             293,622
Employee Stock Purchase Plan [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Number of shares authorized         350,000   350,000             350,000
Minimum work hours per week | item             20              
Minimum months to be eligible to participate             5 months              
Purchase price for share percentage equal to fair value of such shares             95.00%              
Maximum discount to fair value percentage             15.00%              
Shares issued under employee stock purchase plan, shares             1,830