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Fair Value - Additional Information (Detail) (USD $)
 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2011
Sep. 30, 2012
Securities
Jun. 30, 2011
Maryland Financial Bank stock
Mar. 31, 2011
Corporate Trust Preferred
Sep. 30, 2012
Corporate Trust Preferred
Securities
Sep. 30, 2012
Fair Value, Inputs, Level 3
Loan
Sep. 30, 2012
Fair Value, Inputs, Level 2
Property
Fair Value [Line Items]              
Number of impaired assets           25  
Number of other real estate owned assets             3
Number of pooled trust preferred securities         1    
Financial institutions default basis points         1.50%    
Financial institutions recovery rate         0.00%    
Write-down of investment $ 92,000   $ 70,000 $ 22,000      
Number of investment securities continuous unrealized loss positions for more than 12 months   3