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Stock-Based Compensation Plans (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
1 Months Ended 12 Months Ended
May 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized for issuance under the Plan   600,000    
Compensation cost   $ 172 $ 164 $ 101
Service period   3 years    
Grant date fair value of shares granted, amount per share   $ 26.33 $ 25.00  
Stock options granted at percentage of fair value   100.00%    
Options granted 52,475 0 0 52,000
Grant date fair value of options granted, amount per share       $ 3.06
Intrinsic value of options outstanding   372    
Options outstanding, weighted average remaining term   6 years 4 months 21 days    
Intrinsic value of options exercised   73 8 6
Intrinsic value of options exercisable   163    
Options exercisable, weighted average remaining term   5 years 6 months 7 days    
Cash received from exercise of stock options   280 0 59
Tax benefit from exercises of stock options   20 1 2
2008 Stock Incentive Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized for issuance under the Plan   600,000    
Shares available for future grants under the plan   461,310    
2008 Compensation Plan For Non-Employee Directors And Trustees [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized for issuance under the Plan   150,000    
Shares available for future grants under the plan   113,878    
Restricted Stock [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted   6,680 11,054  
Service period   3 years    
Stock Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost   27    
Service period   3 years    
Current Outstanding Restricted Stock Awards [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost   228    
Exercise Price Range $22.07 to $22.93 [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise price range, options outstanding   85,000    
Options exercise price range, lower range limit   $ 22.07    
Options exercise price range, upper range limit   $ 22.93    
Exercise price range $26.63 [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise price range, options outstanding   10,000    
Options exercise price   $ 26.63    
Restricted Stock [Member] | Stock Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost   $ 172 $ 164 $ 101