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Loans and Allowance for Loan Losses (Composition of Nonaccrual Loans by Portfolio Class) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | $ 201,646 | $ 252,800
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 3,941 | 14,574
Total Commercial [Member] | Construction and Land Development [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 3,249 | 3,807
Residential Mortgages [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 31,732 | 40,480
Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 15,576 | 15,087
Total Commercial And Industrial [Member] | Total Commercial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 147,148 | 178,852
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 126,429 | 152,863
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | $ 20,719 | $ 25,989

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