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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