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Employee Benefit Plans (Narrative) (Details) - USD ($)
12 Months Ended
Sep. 18, 2018
Aug. 16, 2018
Dec. 31, 2019
Dec. 31, 2018
Aug. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum percentage of employee compensation as participant's contribution     4.00%    
Contributions to the plan     $ 49,000 $ 44,000  
Deferred compensation expenses     45,000 22,000  
Deferred compensation accrued liability     $ 727,000 $ 704,000  
Total number of common stock shares acquired in the conversion under ESOP     132,250    
Number of common stock shares allocated under ESOP     5,290 5,290  
Number of common stock shares unallocated under ESOP     116,380 121,670  
Compensation expense related to the ESOP     $ 72,000 $ 66,000  
Stock price at the formation date     $ 10.00    
Aggregate fair value of the unallocated shares     $ 1,490,000    
Closing price of the common stock     $ 12.80    
Number of shares authorized under equity incentive plan         231,437
Exercise price of each option        
Fair value of number of share granted $ 3.75 $ 3.69      
Number of stock options granted        
Management and staff          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Term of expiration period 10 years        
Exercise price of each option $ 12.45        
Management and staff | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Term of award vesting period 7 years        
Management and staff | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Term of award vesting period 5 years        
Members of Board of Directors          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Term of award vesting period   5 years      
Term of expiration period   10 years      
Exercise price of each option   $ 12.48      
Restricted Stock Awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation expense under restricted stock award     $ 621,000    
Amount of recognized of share based compensation expense     $ 155,000    
Restricted Stock Awards | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Term of award vesting period     7 years    
Restricted Stock Awards | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Term of award vesting period     5 years    
Restricted Stock Awards | Management and staff          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of restricted shares granted 49,581        
Restricted Stock Awards | Members of Board of Directors          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of restricted shares granted   16,530      
Stock option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized under equity incentive plan         165,312
Unrecognized compensation expense under stock options     $ 409,000    
Amount of recognized of share based compensation expense     103,000    
Amount of granted fair value     $ 544,000    
Number of stock options exercisable     27,537    
Stock option | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Term of award vesting period     7 years    
Stock option | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Term of award vesting period     5 years    
Stock option | Management and staff          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of stock options granted 104,500        
Stock option | Members of Board of Directors          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of stock options granted   41,325      
Restricted stock awards, restricted stock units and unrestricted share awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized under equity incentive plan         66,125