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Summary of Changes in Asset Subject to Fair Value Measurement by Level (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets at fair value $ 102,744 $ 112,317
Investment securities AFS
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Recurring assets at fair value 95,461 102,867
Investment securities AFS | Purchases of investment securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Recurring assets at fair value   22,479
Investment securities AFS | Sales, calls and maturities of investment securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Recurring assets at fair value   29,987
Investment securities AFS | Amortization/accretion of premium/discount
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Recurring assets at fair value   1,234
Investment securities AFS | Increase in market value
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Recurring assets at fair value   1,336
Maryland Financial Bank stock
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-recurring assets at fair value 30 30
Impaired Loans
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-recurring assets at fair value 6,388 8,309
Impaired Loans | New impaired loans
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-recurring assets at fair value   763
Impaired Loans | Payments and other loan reductions
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-recurring assets at fair value   3,134
Impaired Loans | Change in total provision
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-recurring assets at fair value   450
OREO
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-recurring assets at fair value 865 1,111
OREO | Sales of OREO
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-recurring assets at fair value   500
Other Real Estate Owned Converted From Loans
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-recurring assets at fair value   254
Fair Value, Inputs, Level 2
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets at fair value 96,356 104,008
Fair Value, Inputs, Level 2 | Investment securities AFS
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Recurring assets at fair value 95,461 102,867
Fair Value, Inputs, Level 2 | Investment securities AFS | Purchases of investment securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Recurring assets at fair value   22,479
Fair Value, Inputs, Level 2 | Investment securities AFS | Sales, calls and maturities of investment securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Recurring assets at fair value   29,987
Fair Value, Inputs, Level 2 | Investment securities AFS | Amortization/accretion of premium/discount
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Recurring assets at fair value   1,234
Fair Value, Inputs, Level 2 | Investment securities AFS | Increase in market value
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Recurring assets at fair value   1,336
Fair Value, Inputs, Level 2 | Maryland Financial Bank stock
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-recurring assets at fair value 30 30
Fair Value, Inputs, Level 2 | OREO
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-recurring assets at fair value 865 1,111
Fair Value, Inputs, Level 2 | OREO | Sales of OREO
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-recurring assets at fair value   500
Fair Value, Inputs, Level 2 | Other Real Estate Owned Converted From Loans
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-recurring assets at fair value   254
Fair Value, Inputs, Level 3
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets at fair value 6,388 8,309
Fair Value, Inputs, Level 3 | Impaired Loans
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-recurring assets at fair value 6,388 8,309
Fair Value, Inputs, Level 3 | Impaired Loans | New impaired loans
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-recurring assets at fair value   763
Fair Value, Inputs, Level 3 | Impaired Loans | Payments and other loan reductions
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-recurring assets at fair value   3,134
Fair Value, Inputs, Level 3 | Impaired Loans | Change in total provision
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-recurring assets at fair value   $ 450