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Loans And Allowance For Loan Losses (Narrative) (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
item
loan
Mar. 31, 2015
USD ($)
item
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 past due and classified as non-performing     6  
Number of TDRs classified as non-accrual 4      
Number of TDRs past due 30 days or more and still accruing 1      
Defaults on loans that had been modified as TDRs | item 0 0    
Number of relationships to loans classified as troubled debt restructurings 20   17  
Loans | $ $ 529,441   $ 506,842  
Loans to relationships classified as TDRs, Total | $ 3,480   3,162  
Accruing loans contractually past due 30 days or more, total amount | $ 221   0  
Default amounts on loans that had been modified as TDRs | $ 705   826  
Total other real estate owned | $ $ 256 $ 413 $ 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 9   7  
Real Estate Secured [Member]        
Loans And Allowance For Loan Losses [Line Items]        
Number of loans, classified as TDRs, to relationships 8   8  
Commercial And Industrial [Member]        
Loans And Allowance For Loan Losses [Line Items]        
Number of loans, classified as TDRs, to relationships 4   4  
Loans | $ $ 78,640   $ 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 | $ $ 25,195   $ 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 4   2  
Other Consumer Loans [Member]        
Loans And Allowance For Loan Losses [Line Items]        
Number of loans, classified as TDRs, to relationships 1   1  
Lodging And Hospitality Industry [Member]        
Loans And Allowance For Loan Losses [Line Items]        
Percentage of commercial real estate mortgage portfolio 30.00%      
Loans | $ $ 121,589   $ 98,231