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Investment Securities (Details Textual) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Security
Sep. 30, 2011
Sep. 30, 2012
Security
Sep. 30, 2011
Dec. 31, 2011
Security
Investment Securities (Textual) [Abstract]          
Carrying value of securities pledged $ 303,620,000   $ 303,620,000   $ 288,800,000
Number of securities in an unrealized loss position 25   25   28
Percentage of combined depreciation of the combined reported value of the aggregate securities portfolio 3.16%   3.16%   4.51%
OTTI charges incurred 942,000 0 942,000 0  
Reduced severity rate 15.00%   15.00%    
Severity rate reduction period 7 years   7 years    
Number of held-to-maturity securities in a continuous unrealized loss position 0   0   0
Federal Home Loan Bank [Member]
          
Investment Securities (Textual) [Abstract]          
Investment owned at fair value 11,530,000   11,530,000   10,820,000
Federal Reserve Bank Richmond Stock [Member]
          
Investment Securities (Textual) [Abstract]          
Investment owned at fair value 5,690,000   5,690,000   4,780,000
Mortgage-backed securities Non-Agency Alt-A residential [Member]
          
Investment Securities (Textual) [Abstract]          
OTTI charges incurred 0 210,000 0 737,000  
Voluntary constant prepayment rate 5.00%   5.00%    
Constant default rate scenario 21.00%   21.00%    
Remaining underlying mortgages default period 3 years   3 years    
Severity rate 75.00%   75.00%    
Equity Securities [Member]
          
Investment Securities (Textual) [Abstract]          
OTTI charges incurred $ 0 $ 0 $ 0 $ 0