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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 |

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