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Stock-Based Compensation (Narrative) (Details)
12 Months Ended
May. 27, 2015
director
shares
Jul. 29, 2014
USD ($)
shares
Jun. 26, 2013
USD ($)
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock options outstanding       495,832 743,015 608,905
Stock-based compensation expense applicable to the Plans | $       $ 63,932 $ 415,560  
Unrecognized stock-based compensation expense | $       $ 118,272    
Period for recognition of stock-option compensation expense       3 years 6 months 15 days    
Shares of common stock granted to certain directors and officers       15,296 16,256  
2015 Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Aggregate number of shares authorized       100,000    
Grants of shares authorized       0    
2015 Plan [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Aggregate number of shares that may be issued to any participant in a calendar year       20,000    
2015 Plan [Member] | Incentive Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Aggregate number of shares authorized       100,000    
2015 Plan [Member] | Performance-based Compensation [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Aggregate number of shares that may be issued to any participant in a calendar year       20,000    
Jefferson Bancorp, Inc. 2010 Stock Option Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Aggregate number of shares authorized       577,642    
Ratio of common stock shares to be received per share of acquiree       2.2217    
Term of plan, in years       10 years    
Purchase price of common stock as percentage of fair market value       100.00%    
Stock options outstanding       259,940    
2007 Equity Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Aggregate number of shares authorized       500,000    
Stock options outstanding       235,892    
Revised Director Compensation Policy [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense applicable to the Plans | $       $ 79,989 $ 84,153  
Unrecognized stock-based compensation expense | $       $ 33,333    
Fair market value of annual grant of restricted stock | $     $ 10,000      
Vesting period     1 year      
Cumulative number of shares granted       48,997    
Shares of common stock granted to certain directors and officers 15,296          
Number of directors | director 8          
Other Stock Awards [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense applicable to the Plans | $   $ 1,007,000        
Shares of common stock granted to certain directors and officers   212,000   0