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Stock Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Nov. 13, 2018
Feb. 08, 2017
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Summary of stock Issuances [Abstract]            
Stock based compensation expense     $ 140 $ 475 $ 1,154 $ 1,343
Class B [Member]            
Share-based Compensation [Abstract]            
Shares distribution period from grant date       1 year    
Summary of stock Issuances [Abstract]            
Vesting period       3 years    
Class B [Member] | 5/10/2016 [Member]            
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    
Grant date fair value per share (in dollars per share)       $ 24.89    
Class B [Member] | 5/9/2017 [Member]            
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    
Grant date fair value per share (in dollars per share)       $ 24.20    
Class B [Member] | 8/31/2017 [Member]            
Summary of stock Issuances [Abstract]            
Number of shares issued (in shares)       1,257    
Vesting date       May 09, 2018    
Service period       8/31/2017 - 6/30/2018    
Grant date fair value per share (in dollars per share)       $ 21.90    
Class B [Member] | 2/9/2018 [Member]            
Summary of stock Issuances [Abstract]            
Number of shares issued (in shares)       408    
Vesting date       May 09, 2018    
Service period       2/9/2018 - 6/30/2018    
Grant date fair value per share (in dollars per share)       $ 24.20    
Class B [Member] | 5/8/2018 [Member]            
Summary of stock Issuances [Abstract]            
Number of shares issued (in shares)       19,085    
Vesting date       May 08, 2019    
Service period       7/1/2018 - 6/30/2019    
Grant date fair value per share (in dollars per share)       $ 23.05    
Class B [Member] | Outside Director [Member]            
Summary of stock Issuances [Abstract]            
Compensation cost charged against income       $ 464 $ 454 $ 460
Class B [Member] | Executives [Member]            
Summary of stock Issuances [Abstract]            
Grant date fair value per share (in dollars per share)   $ 23.80        
Shares awarded (in shares)   20,181        
Total value of shares issued   $ 480        
Restricted [Member] | Class B [Member] | Chief Executive Officer [Member]            
Summary of stock Issuances [Abstract]            
Number of shares issued (in shares) 85,000          
Restricted [Member] | Class B [Member] | Chief Executive Officer [Member] | 10/17/2019 [Member]            
Summary of stock Issuances [Abstract]            
Number of shares vested (in shares) 42,500          
Restricted [Member] | Class B [Member] | Chief Executive Officer [Member] | 10/17/2020 [Member]            
Summary of stock Issuances [Abstract]            
Number of shares vested (in shares) 21,250          
Restricted [Member] | Class B [Member] | Chief Executive Officer [Member] | 10/17/2021 [Member]            
Summary of stock Issuances [Abstract]            
Number of shares vested (in shares) 21,250          
1981 Stock Purchase Plan [Member]            
Share-based Compensation [Abstract]            
Purchase price of shares obligated to be repurchased, percentage of book value       90.00%    
1981 Stock Purchase Plan [Member] | Class A [Member]            
Share-based Compensation [Abstract]            
Number of outstanding shares eligible for repurchase (in shares)     46,875 46,875    
1981 Stock Purchase Plan [Member] | Class B [Member]            
Share-based Compensation [Abstract]            
Number of outstanding shares eligible for repurchase (in shares)     187,500 187,500    
2017 LTIP Awards [Member] | Performance Based Equity Award [Member] | Class B [Member]            
Summary of stock Issuances [Abstract]            
Number of shares issued (in shares)       0    
2017 VCIP Awards [Member] | Performance Based Equity Award [Member] | Class B [Member]            
Summary of stock Issuances [Abstract]            
Number of shares issued (in shares)       0    
Performance period       3 years    
2018 LTIP Awards [Member] | Performance Based Equity Award [Member] | Class B [Member]            
Summary of stock Issuances [Abstract]            
Number of shares issued (in shares)       0    
2018 VCIP Awards [Member] | Performance Based Equity Award [Member] | Class B [Member]            
Summary of stock Issuances [Abstract]            
Number of shares issued (in shares)       0    
Performance period       3 years