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Loans And Allowance For Loan Losses (Narrative) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) loan contract item | Dec. 31, 2015 USD ($) loan contract item | Dec. 31, 2014 contract
Loans And Allowance For Loan Losses [Line Items] |  |  |
Number of loans, classified as TDRs, to relationships | item | 27 | 17 |
Number of defaulted loans that had been modified as TDRs | contract | 0 | 0 | 0
Loans | $ 553,683 | $ 506,842 |
Loans to relationships classified as TDRs, Total | $ 4,236 | $ 3,162 |
Loans past due or non-performing to related parties | loan | 0 | 0 |
Real estate loans under foreclosure | $ 2,394 | $ 4,757 |
Residential Real Estate Mortgages [Member] |  |  |
Loans And Allowance For Loan Losses [Line Items] |  |  |
Purchased loans, consisting of residential real estate mortgages | 230,995 | $ 137,907 |
Collateral Pledged [Member] |  |  |
Loans And Allowance For Loan Losses [Line Items] |  |  |
Total pledged loans | $ 95,852 |  |
Non-Accrual [Member] |  |  |
Loans And Allowance For Loan Losses [Line Items] |  |  |
Number of TDRs classified as non-accrual | contract | 17 | 6 |
Total amount of loans classified as non-accrual | $ 1,523 | $ 826 |
Past Due 30 Days Or More And Still Accruing [Member] |  |  |
Loans And Allowance For Loan Losses [Line Items] |  |  |
Accruing loans contractually past due 30 days or more, total amount | $ 0 | $ 0 |
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] | 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 |  |
Percentage of appraised value of residential real estate loans | 80.00% |  |
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 | contract | 12 | 7 |
Commercial Real Estate [Member] | Minimum [Member] |  |  |
Loans And Allowance For Loan Losses [Line Items] |  |  |
Number of years for which principally collateralized loans are amortized | 15 years |  |
Commercial Real Estate [Member] | Maximum [Member] |  |  |
Loans And Allowance For Loan Losses [Line Items] |  |  |
Number of years for which principally collateralized loans are amortized | 20 years |  |
Real Estate Secured [Member] |  |  |
Loans And Allowance For Loan Losses [Line Items] |  |  |
Number of loans, classified as TDRs, to relationships | contract | 8 | 8 |
Commercial And Industrial [Member] |  |  |
Loans And Allowance For Loan Losses [Line Items] |  |  |
Number of loans, classified as TDRs, to relationships | contract | 5 | 4 |
Loans | $ 103,586 | $ 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 | $ 14,695 | $ 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 [Member] |  |  |
Loans And Allowance For Loan Losses [Line Items] |  |  |
Number of loans, classified as TDRs, to relationships | contract | 4 | 2 |
Other Consumer [Member] |  |  |
Loans And Allowance For Loan Losses [Line Items] |  |  |
Number of loans, classified as TDRs, to relationships | contract | 3 | 1 |
Lodging And Hospitality Industry [Member] |  |  |
Loans And Allowance For Loan Losses [Line Items] |  |  |
Loans | $ 128,680 | $ 98,231 |
Lodging And Hospitality Industry [Member] | Commercial Real Estate [Member] |  |  |
Loans And Allowance For Loan Losses [Line Items] |  |  |
Percentage of commercial real estate mortgage portfolio | 31.60% |  |

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