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Earnings Per Common Share And Share Awards (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Earnings Per Common Share And Share Awards [Line Items]        
Anti-dilutive shares excluded from computation of diluted earnings per share 0 7,500 0 4,500
SARs and options vesting period     1 year  
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period     4,500 4,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 28.75 $ 31.16
Compensation expense relating to SARs or options vesting     $ 100,000 $ 103,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 65,000   $ 65,000  
Number of stock options or SARs granted where exercise price was less than market price on date of grant     0 0
Minimum        
Earnings Per Common Share And Share Awards [Line Items]        
SARs and options expiration period     5 years  
Maximum        
Earnings Per Common Share And Share Awards [Line Items]        
Maximum shares of Company stock to be granted to key employees or directors     250,000  
SARs and options expiration period     7 years