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Investment Securities - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Investment Securities [Line Items]        
Proceeds from sales of available for sale securities   18,656,622 21,796,185 $ 9,073,406
Realized gain on sale   282,069 434,113 176,046
Realized loss on sale   119,475 25,467 882
Income tax expense relating to net gains on sales of investment securities   64,135 161,190 69,674
Write-down of investment   0 91,928 262,208
Maryland Financial Bank stock
        
Investment Securities [Line Items]        
Write-down of investment     70,000  
Securities
        
Investment Securities [Line Items]        
Impairment Of Investments Net Present Value 635,228      
Corporate Trust Preferred
        
Investment Securities [Line Items]        
Write-down of investment 21,928     110,208
Impairment Of Investments Net Present Value       838,136
Assumed Future Inputs Net Default Basis Points Rate This testing assumed future defaults on the currently performing financial institutions of 75 basis points applied annually with a 15% recovery after a two year lag on both current and future defaulting financial institutions. This testing assumed future defaults on the currently performing financial institutions of 150 basis points applied annually with a 0% recovery on both current and future defaulting financial institutions. At year-end, the Company retested for possible OTTI by using a more stringent test by recalculating the net present value using a default rate of 150 basis points applied annually with a 0% recovery.  
Freddie Mac and Fannie Mae securities
        
Investment Securities [Line Items]        
Write-down of investment       $ 152,000