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Share Based Compensation Share Based Compensation (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Payment Arrangement, Expense $ 80,000     $ 149,000 $ 402,000 $ 430,000  
Share-based Payment Arrangement, Expense, Tax Benefit 19,000     $ 36,000 $ 96,000 $ 103,000  
Stock Issued During Period, Shares, Restricted Stock Award, Gross   10,995 1,846       2,892
Years for Unrecognized Compensation Expense Expected to be Recognized on Nonvested Awards         1 year 10 months 13 days    
Unrecognized Compensation Expense Nonvested Awards $ 1,370,000       $ 1,370,000    
Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   4 years 2 years       3 years
Minimum [Member] | Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         3 years    
Maximum [Member] | Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         5 years