| Business Combinations (Details Textual) (USD $) | 3 Months Ended | 9 Months Ended | 
|---|---|---|
| Sep. 30, 2012 | Sep. 30, 2012 | |
| Harrisonburg branch acquisition [Member] | ||
| Business Combinations (Textual) [Abstract] | ||
| Amount of loans purchased | $ 72,500,000 | |
| Deposit liabilities | 48,900,000 | 48,900,000 | 
| Company recorded goodwill amount | 1,800,000 | 1,800,000 | 
| Core deposit intangible | 9,500 | 9,500 | 
| Fair value inputs discount value | 1,700,000 | |
| Fair value estimate loan portfolio | 70,500,000 | 70,500,000 | 
| Impaired loan portfolio fair value estimate | 276,000 | 276,000 | 
| Interest income | 640,000 | |
| First Market Bank Acquisition [Member] | ||
| Business Combinations (Textual) [Abstract] | ||
| Interest income | $ 6,500,000 | 
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- Details 
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- Definition Deposits purchased in acquisition. No definition available. 
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- Definition Fair value discount of loans purchased in acquisition. No definition available. 
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- Definition Fair value of loans purchased in acquisition non performing. No definition available. 
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- Definition Fair value of loans purchased in acquisition performing. No definition available. 
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- Definition Interest and fee income loans purchased in acquisition. No definition available. 
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- Definition Loans purchased in acquisition. No definition available. 
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- Definition Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount of acquisition cost of a business combination allocated to assets, excluding financial assets and goodwill, lacking physical substance. No definition available. 
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