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Stock Purchase and Option Plans (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 1 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
May 31, 2013
May 31, 2012
May 31, 2011
Dec. 31, 2013
Stock Options [Member]
Plan
Dec. 31, 2013
Restricted Stock Units (RSUs) [Member]
Plan
Dec. 31, 2013
Restricted Stock Units (RSUs) [Member]
Outside Director [Member]
Dec. 31, 2012
Restricted Stock Units (RSUs) [Member]
Outside Director [Member]
Dec. 31, 2011
Restricted Stock Units (RSUs) [Member]
Outside Director [Member]
Dec. 31, 2013
Restricted Stock Units (RSUs) [Member]
Class B [Member]
Outside Director [Member]
Dec. 31, 2012
Restricted Stock Units (RSUs) [Member]
Class B [Member]
Outside Director [Member]
Dec. 31, 2011
Restricted Stock Units (RSUs) [Member]
Class B [Member]
Outside Director [Member]
Feb. 04, 2013
Restricted Stock Units (RSUs) [Member]
Class B [Member]
Executives [Member]
Feb. 04, 2014
Restricted Stock Units (RSUs) [Member]
Class B [Member]
Executives [Member]
Subsequent Event [Member]
Dec. 31, 2013
Stock Purchase Plan [Member]
Dec. 31, 2013
Stock Purchase Plan [Member]
Class A [Member]
Dec. 31, 2013
Stock Purchase Plan [Member]
Class B [Member]
Dec. 31, 2013
Director Option Plan [Member]
Class B [Member]
Non-Employee Director [Member]
Dec. 31, 2013
Director Option Plan [Member]
Stock Options [Member]
Non-Employee Director [Member]
Dec. 31, 2012
Director Option Plan [Member]
Stock Options [Member]
Non-Employee Director [Member]
Dec. 31, 2011
Director Option Plan [Member]
Stock Options [Member]
Non-Employee Director [Member]
Dec. 31, 2013
Employee Option Plan [Member]
Class B [Member]
Employees [Member]
Dec. 31, 2013
Employee Option Plan [Member]
Stock Options [Member]
Employees [Member]
Dec. 31, 2012
Employee Option Plan [Member]
Stock Options [Member]
Employees [Member]
Dec. 31, 2011
Employee Option Plan [Member]
Stock Options [Member]
Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                
Purchase price of shares obligated to be repurchased, percentage of book value (in hundredths)                           90.00%                    
Number of shares repurchased under the plan (in shares)                           0                    
Number of outstanding shares eligible for repurchase (in shares)                             124,099 380,458                
Number of share based compensation plan       2 1                                      
Shares of common stock reserved for granting of discounted and market value option (in shares)                                 300,000       1,125,000      
Common stock available for future grants (in shares)                                 167,000       259,000      
Options granted (in shares)                                   0 0 0   0 0 0
Discounted options outstanding (in shares)                                   0 0 0   0 0 0
Discounted option exercised (in shares)                                   0 0 0   0 0 0
Compensation cost charged against income           $ 440 $ 440 $ 440                   $ 0 $ 0 $ 0   $ 0 $ 0 $ 0
Shares issued (in shares)                       52,389 45,678                      
Value of each share issued (in dollars per share) $ 24.30 $ 21.87 $ 22.50                 $ 23.69 $ 23.81                      
Total value of shares issued                 $ 440 $ 440 $ 440 $ 1,241 $ 1,088                      
Summary of stock Issuances [Abstract]                                                
Shares granted (in shares) 18,106 20,119 19,558                                          
Vesting Date May 07, 2014 May 08, 2013 May 10, 2012                                          
Period 7/1/2013 - 6/30/2014 7/1/2012 - 6/30/2013 7/1/2011 - 6/30/2012                                          
Period restricted stocks will vest ratably from date of grant         3 years