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Earnings Per Common Share And Share Awards (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Earnings Per Common Share And Share Awards [Line Items]          
Anti-dilutive shares excluded from computation of diluted earnings per share 14,000 9,000 14,000 4,000  
Number of SARs granted where exercise price was less than market price on date of grant     0    
Share-based Payment Arrangement, Expense     $ 205 $ 239  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 117   $ 117    
SARs          
Earnings Per Common Share And Share Awards [Line Items]          
SARs expiration period     7 years    
SARs vesting period     1 year    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures     4,000 4,000 4,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 51.88 $ 78.61  
Maximum | SARs          
Earnings Per Common Share And Share Awards [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Shares Purchased for Award     250,000