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Nature of Operations and Summary of Significant Accounting Policies (Share-based Compensation) (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Director | Share-based Payment Arrangement, Nonemployee        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense   $ 162 $ 155  
Board of Directors Chairman | Share-based Payment Arrangement, Nonemployee        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense   $ 250 $ 250  
Restricted Stock | Share-based Payment Arrangement, Nonemployee        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares issued during the period   74,337 50,237 33,822
Number of shares available for grant (in shares)   41,604    
Share-based compensation expense   $ 1,100 $ 1,200 $ 900
Election to receive common shares in lieu of cash, maximum percentage of annual retainer   100.00%    
Restricted Stock | Director | Share-based Payment Arrangement, Nonemployee        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense   $ 100 95  
Restricted Stock | Board of Directors Chairman | Share-based Payment Arrangement, Nonemployee        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense   $ 150 $ 150  
Restricted Stock, Voluntary Elections | Share-based Payment Arrangement, Nonemployee        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares issued during the period   2,343 0  
Executive Plan | Performance Shares        
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   94,898 118,688 5,512
Number of shares available for grant (in shares)   430,902    
Share-based compensation expense   $ 2,900 $ 1,600 $ 2,700
Restriction Period One | Restricted Stock | Share-based Payment Arrangement, Nonemployee        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restriction period from award date   10 years    
Restriction Period One | Executive Plan | Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restriction period from award date 3 years      
Restriction Period Two | Restricted Stock | Share-based Payment Arrangement, Nonemployee        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restriction period from award date   5 years    
Restriction Period Two | Executive Plan | Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restriction period from award date 5 years      
Restriction Period Three | Executive Plan | Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restriction period from award date 10 years