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Nature of Operations and Summary of Significant Accounting Policies (Share-based Compensation) (Details) - Executive Plan - Performance Shares - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restriction period from retirement date, participant's death or permanent disability 3 years      
Number of shares issued during the period   118,688 5,512 0
Share-based compensation expense   $ 1.6 $ 2.7  
Restriction Period One        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restriction period from award date 3 years      
Restriction Period Two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restriction period from award date 5 years      
Restriction Period Three        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restriction period from award date 10 years