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Stock Plans (Narrative) (Details)
1 Months Ended 9 Months Ended
Feb. 02, 2016
$ / shares
shares
Feb. 29, 2016
$ / shares
Sep. 30, 2016
USD ($)
$ / shares
item
shares
Sep. 30, 2015
shares
Dec. 31, 2015
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of active share-based compensation plans | item     2    
Common stock, no par value | $ / shares      
Shares granted        
Options exercised     500 0  
Options exercised, price per share | $ / shares     $ 27.75    
Options exercised, intrinsic value | $     $ 2,585    
Options exercised, tax benefit | $     $ 808    
Stock-Based Compensation Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted     8,805 7,950  
Stock-Settled Stock Appreciation Rights (SSARs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted     19,341    
Vesting period     3 years    
Options exercised        
Options exercised, price per share | $ / shares        
Omnibus Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized     500,000    
Omnibus Plan [Member] | Stock-Settled Stock Appreciation Rights (SSARs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Grant date stock price | $ / shares   $ 5.21      
Interest rate   1.861%      
Expected term   10 years      
Volatility rate   23.402%      
Dividend rate   3.577%      
Director Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized     500,000    
Director Plan [Member] | Stock-Based Compensation Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted     5,600 3,200  
Vesting period     1 year 1 year  
Long-Term Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     3 years    
Long-Term Incentive Plan [Member] | Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Holding period     2 years    
Long-Term Incentive Plan [Member] | Stock-Settled Stock Appreciation Rights (SSARs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expected term     10 years    
Employee Stock Purchase Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized     110,000.00    
Number of shares issued     42,382.00    
Award Date One [Member] | Omnibus Plan [Member] | Stock-Based Compensation Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted     3,155 3,300  
Vesting period     3 years 4 years  
Award Date One [Member] | Omnibus Plan [Member] | Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted 3,155        
Vesting period 3 years        
Holding period 2 years        
Grant date stock price | $ / shares $ 32.40        
Interest rate 1.276%        
Volatility rate 9.809%        
Dividend rate 0.00%        
Term used to determine historical volatility 5 years        
Award Date Two [Member] | Omnibus Plan [Member] | Stock-Based Compensation Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted     50 50  
Vesting period     1 year 1 year  
Award Date Three [Member] | Omnibus Plan [Member] | Stock-Based Compensation Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted       1,400  
Vesting period       4 years