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Loans And Allowance For Loan Losses (Narrative) (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
loan
Sep. 30, 2015
USD ($)
loan
Dec. 31, 2015
USD ($)
loan
Dec. 31, 2014
USD ($)
Loans And Allowance For Loan Losses [Line Items]        
Period of delinquency after which a loan is placed on non-accruals status 90 days      
Loans charge off period 120 days      
Loan returned to accrual status, performance required, months 6 months      
Number of TDRs classified as non-accrual | loan 14   6  
Number of defaulted loans that had been modified as TDRs | loan 1 0    
Modified troubled debt restructurings resulting in default $ 40 $ 0    
Number of relationships to loans classified as troubled debt restructurings | loan 26   17  
Loans $ 533,750   $ 506,842  
Loans to relationships classified as TDRs, Total 4,323   3,162  
Accruing loans contractually past due 30 days or more, total amount 0   0  
Default amounts on loans that had been modified as TDRs 1,403   826  
Total other real estate owned $ 189 $ 818 $ 256 $ 523
Minimum [Member] | Commercial Real Estate Mortgages [Member]        
Loans And Allowance For Loan Losses [Line Items]        
Number of years for which principally collateralized loans are amortized 15 years      
Minimum [Member] | Residential Real Estate Mortgages [Member]        
Loans And Allowance For Loan Losses [Line Items]        
Number of years for which principally collateralized loans are amortized 10 years      
Maximum [Member]        
Loans And Allowance For Loan Losses [Line Items]        
Percentage of appraised value of residential real estate loans 80.00%      
Maximum [Member] | Commercial Real Estate Mortgages [Member]        
Loans And Allowance For Loan Losses [Line Items]        
Number of years for which principally collateralized loans are amortized 20 years      
Maximum [Member] | Residential Real Estate Mortgages [Member]        
Loans And Allowance For Loan Losses [Line Items]        
Number of years for which principally collateralized loans are amortized 30 years      
Home Equity Loans [Member] | Maximum [Member]        
Loans And Allowance For Loan Losses [Line Items]        
Combined loan-to-value ratio 85.00%      
Commercial Real Estate [Member]        
Loans And Allowance For Loan Losses [Line Items]        
Number of loans, classified as TDRs, to relationships | loan 12   7  
Real Estate Secured [Member]        
Loans And Allowance For Loan Losses [Line Items]        
Number of loans, classified as TDRs, to relationships | loan 8   8  
Commercial And Industrial [Member]        
Loans And Allowance For Loan Losses [Line Items]        
Number of loans, classified as TDRs, to relationships | loan 5   4  
Loans $ 97,608   $ 79,911  
Commercial And Industrial [Member] | Maximum [Member]        
Loans And Allowance For Loan Losses [Line Items]        
Number of years for which principally collateralized loans are amortized 10 years      
Commercial Construction And Land Development [Member]        
Loans And Allowance For Loan Losses [Line Items]        
Loans $ 15,869   $ 24,926  
Commercial Construction And Land Development [Member] | Minimum [Member]        
Loans And Allowance For Loan Losses [Line Items]        
Number of months for which principally collateralized loans are amortized 6 months      
Commercial Construction And Land Development [Member] | Maximum [Member]        
Loans And Allowance For Loan Losses [Line Items]        
Number of months for which principally collateralized loans are amortized 24 months      
Agricultural And Other Loans To Farmers [Member]        
Loans And Allowance For Loan Losses [Line Items]        
Number of loans, classified as TDRs, to relationships | loan 4   2  
Other Consumer Loans [Member]        
Loans And Allowance For Loan Losses [Line Items]        
Number of loans, classified as TDRs, to relationships | loan 2   1  
Lodging And Hospitality Industry [Member]        
Loans And Allowance For Loan Losses [Line Items]        
Percentage of commercial real estate mortgage portfolio 32.00%      
Loans $ 123,946   $ 98,231