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Restricted Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Feb. 08, 2017
Jun. 30, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares distribution period from grant date   1 year  
5/10/2016 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Value per share on grant date (in dollars per share)   $ 24.89  
Summary of stock Issuances [Abstract]      
Number of shares issued (in shares)   17,677  
Vesting date   May 10, 2017  
Service Period   7/1/2016 - 6/30/2017  
5/09/2017 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Value per share on grant date (in dollars per share)   $ 24.20  
Summary of stock Issuances [Abstract]      
Number of shares issued (in shares)   18,183  
Vesting date   May 09, 2018  
Service Period   7/1/2017 - 6/30/2018  
Restricted Stock Units (RSUs) [Member]      
Summary of stock Issuances [Abstract]      
Period restricted stocks will vest ratably from date of grant   3 years  
Restricted Stock Units (RSUs) [Member] | Class B [Member] | Outside Director [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total value of shares issued   $ 440 $ 440
Restricted Stock Units (RSUs) [Member] | Class B [Member] | Executives [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total value of shares issued $ 480    
Shares awarded (in shares) 20,181    
Value per share on grant date (in dollars per share) $ 23.80