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Loans and Allowance for Loan Losses (Schedule of Loan Portfolio by Category) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Loan Portfolio            
Gross loans prior to deferred fees $ 626,792   $ 596,310      
Less: Deferred loan costs, net 1,426   1,243      
Allowance for loan losses (8,171) $ (8,083) (8,240) $ (7,802) $ (7,672) $ (7,562)
Total net loans 620,047   589,313 570,309    
Home Equity Loan [Member]            
Loan Portfolio            
Gross loans prior to deferred fees 10,184   11,181      
Home Equity Lines of Credit [Member]            
Loan Portfolio            
Gross loans prior to deferred fees 62,936   61,104      
Commercial Real Estate [Member]            
Loan Portfolio            
Gross loans prior to deferred fees 262,807   260,792      
Allowance for loan losses (4,004) (4,047) (3,863) (3,728) (3,520) (3,795)
Commercial Real Estate [Member] | Mortgages [Member]            
Loan Portfolio            
Gross loans prior to deferred fees 91,556   90,072      
Commercial Real Estate [Member] | Agricultural Sector [Member]            
Loan Portfolio            
Gross loans prior to deferred fees 153,034   152,050      
Commercial Real Estate [Member] | Construction [Member]            
Loan Portfolio            
Gross loans prior to deferred fees 18,217   18,670      
Consumer Real Estate [Member]            
Loan Portfolio            
Gross loans prior to deferred fees [1] 266,274   249,256      
Allowance for loan losses (2,182) (2,189) (2,052) (1,918) (1,835) (1,652)
Consumer Real Estate [Member] | 1-4 Family Residential Mortgages [Member]            
Loan Portfolio            
Gross loans prior to deferred fees [1] 193,154   176,971      
Consumer Real Estate [Member] | Home Equity Loan [Member]            
Loan Portfolio            
Gross loans prior to deferred fees [1] 10,184   11,181      
Consumer Real Estate [Member] | Home Equity Lines of Credit [Member]            
Loan Portfolio            
Gross loans prior to deferred fees [1] 62,936   61,104      
Commercial and Industrial [Member]            
Loan Portfolio            
Gross loans prior to deferred fees 87,496   80,942      
Allowance for loan losses (1,282) (1,301) (1,829)      
Commercial and Industrial [Member] | Agricultural Sector [Member]            
Loan Portfolio            
Gross loans prior to deferred fees 18,209   18,794      
Commercial and Industrial [Member] | Commercial and Industrial Sector [Member]            
Loan Portfolio            
Gross loans prior to deferred fees 47,517   41,426      
Commercial and Industrial [Member] | Tax-free loans [Member]            
Loan Portfolio            
Gross loans prior to deferred fees 21,770   20,722      
Consumer Portfolio Segment [Member]            
Loan Portfolio            
Gross loans prior to deferred fees 10,215   5,320      
Allowance for loan losses $ (131) $ (72) $ (98) $ (119) $ (83) $ (82)
[1] Real estate loans serviced for others, which are not included in the Consolidated Balance Sheets, totaled $108,907,000 and $98,262,000 as of June 30, 2018, and December 31, 2017, respectively.