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Investment Securities (Details Textual) (USD $) | 3 Months Ended | 6 Months Ended |  |  |  |  |  | 6 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2012 Security | Jun. 30, 2011 | Jun. 30, 2012 Security | Dec. 31, 2011 Security | Jun. 30, 2012 Federal Home Loan Bank [Member] | Dec. 31, 2011 Federal Home Loan Bank [Member] | Jun. 30, 2012 Federal Reserve Bank Richmond Stock [Member] | Dec. 31, 2011 Federal Reserve Bank Richmond Stock [Member] | Jun. 30, 2012 Mortgage-Backed Securities Non-Agency Alt-A Residential [Member] | Jun. 30, 2011 Mortgage-Backed Securities Non-Agency Alt-A Residential [Member] | Jun. 30, 2012 Equity Securities [Member] | Jun. 30, 2011 Equity Securities [Member] | Jun. 30, 2012 Equity Securities [Member] | Jun. 30, 2011 Equity Securities [Member]
Investment Securities (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of securities pledged | $ 295,370,000 |  | $ 295,370,000 | $ 288,800,000 |  |  |  |  |  |  |  |  |  |
Number of securities in an unrealized loss position | 58 |  | 58 | 28 |  |  |  |  |  |  |  |  |  |
Percentage of combined depreciation of the combined reported value of the aggregate securities portfolio | 3.31% |  | 3.31% | 4.51% |  |  |  |  |  |  |  |  |  |
OTTI charges incurred | 0 | 0 | 0 |  |  |  |  |  | 0 | 527,000 | 0 | 0 | 0 | 0
Voluntary constant prepayment rate |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |
Constant default rate scenario |  |  |  |  |  |  |  |  | 18.00% |  |  |  |  |
Remaining underlying mortgages default period |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Severity rate |  |  |  |  |  |  |  |  | 60.00% |  |  |  |  |
Reduced severity rate | 15.00% |  | 15.00% |  |  |  |  |  |  |  |  |  |  |
Severity rate reduction period | 5 years |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Investment owned at fair value |  |  |  |  | $ 12,780,000 | $ 10,820,000 | $ 5,690,000 | $ 4,780,000 |  |  |  |  |  |
Number of held-to-maturity securities in a continuous unrealized loss position | 0 |  | 0 | 0 |  |  |  |  |  |  |  |  |  |

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