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Assets Measured at Fair Value on Recurring and Nonrecurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale $ 113,664 $ 122,973
Fair Value, Measurements, Recurring
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 113,664 122,973
Fair Value, Measurements, Recurring | Agency mortgage-backed securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 19,704 23,206
Fair Value, Measurements, Recurring | Agency CMO
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 23,790 22,660
Fair Value, Measurements, Recurring | Agency notes and bonds
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 33,583 38,553
Fair Value, Measurements, Recurring | Municipal Obligations
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 34,013 34,317
Fair Value, Measurements, Recurring | Mutual funds
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 2,574 4,237
Fair Value, Measurements, Nonrecurring
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 4,032 5,931
Loans held for sale 1,166 3,609
Foreclosed real estate 403 295
Fair Value, Measurements, Nonrecurring | Residential
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 1,728 2,157
Foreclosed real estate 366 258
Fair Value, Measurements, Nonrecurring | Land
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 127 125
Foreclosed real estate 37 37
Fair Value, Measurements, Nonrecurring | Construction
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 203 403
Fair Value, Measurements, Nonrecurring | Commercial Real Estate
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 963 2,561
Fair Value, Measurements, Nonrecurring | Real Estate Construction
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 711 678
Fair Value, Measurements, Nonrecurring | Home Equity and Second Mortgage
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 300 7
Level 1
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 2,574 4,237
Loans held for sale 0 0
Level 1 | Fair Value, Measurements, Recurring
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 2,574 4,237
Level 1 | Fair Value, Measurements, Recurring | Agency mortgage-backed securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Level 1 | Fair Value, Measurements, Recurring | Agency CMO
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Level 1 | Fair Value, Measurements, Recurring | Agency notes and bonds
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Level 1 | Fair Value, Measurements, Recurring | Municipal Obligations
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Level 1 | Fair Value, Measurements, Recurring | Mutual funds
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 2,574 4,237
Level 1 | Fair Value, Measurements, Nonrecurring
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 0 0
Loans held for sale 0 0
Foreclosed real estate 0 0
Level 1 | Fair Value, Measurements, Nonrecurring | Residential
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 0 0
Foreclosed real estate 0 0
Level 1 | Fair Value, Measurements, Nonrecurring | Land
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 0 0
Foreclosed real estate 0 0
Level 1 | Fair Value, Measurements, Nonrecurring | Construction
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 0 0
Level 1 | Fair Value, Measurements, Nonrecurring | Commercial Real Estate
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 0 0
Level 1 | Fair Value, Measurements, Nonrecurring | Real Estate Construction
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 0 0
Level 1 | Fair Value, Measurements, Nonrecurring | Home Equity and Second Mortgage
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 0 0
Level 2
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 111,090 118,736
Loans held for sale 1,191 3,705
Level 2 | Fair Value, Measurements, Recurring
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 111,090 118,736
Level 2 | Fair Value, Measurements, Recurring | Agency mortgage-backed securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 19,704 23,206
Level 2 | Fair Value, Measurements, Recurring | Agency CMO
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 23,790 22,660
Level 2 | Fair Value, Measurements, Recurring | Agency notes and bonds
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 33,583 38,553
Level 2 | Fair Value, Measurements, Recurring | Municipal Obligations
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 34,013 34,317
Level 2 | Fair Value, Measurements, Recurring | Mutual funds
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Level 2 | Fair Value, Measurements, Nonrecurring
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 0 0
Loans held for sale 1,166 3,609
Foreclosed real estate 0 0
Level 2 | Fair Value, Measurements, Nonrecurring | Residential
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 0 0
Foreclosed real estate 0 0
Level 2 | Fair Value, Measurements, Nonrecurring | Land
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 0 0
Foreclosed real estate 0 0
Level 2 | Fair Value, Measurements, Nonrecurring | Construction
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 0 0
Level 2 | Fair Value, Measurements, Nonrecurring | Commercial Real Estate
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 0 0
Level 2 | Fair Value, Measurements, Nonrecurring | Real Estate Construction
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 0 0
Level 2 | Fair Value, Measurements, Nonrecurring | Home Equity and Second Mortgage
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 0 0
Level 3
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Loans held for sale 0 0
Level 3 | Fair Value, Measurements, Recurring
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Level 3 | Fair Value, Measurements, Recurring | Agency mortgage-backed securities
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Level 3 | Fair Value, Measurements, Recurring | Agency CMO
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Level 3 | Fair Value, Measurements, Recurring | Agency notes and bonds
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Level 3 | Fair Value, Measurements, Recurring | Municipal Obligations
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Level 3 | Fair Value, Measurements, Recurring | Mutual funds
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Level 3 | Fair Value, Measurements, Nonrecurring
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 4,032 5,931
Loans held for sale 0 0
Foreclosed real estate 403 295
Level 3 | Fair Value, Measurements, Nonrecurring | Residential
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 1,728 2,157
Foreclosed real estate 366 258
Level 3 | Fair Value, Measurements, Nonrecurring | Land
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 127 125
Foreclosed real estate 37 37
Level 3 | Fair Value, Measurements, Nonrecurring | Construction
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 203 403
Level 3 | Fair Value, Measurements, Nonrecurring | Commercial Real Estate
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 963 2,561
Level 3 | Fair Value, Measurements, Nonrecurring | Real Estate Construction
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 711 678
Level 3 | Fair Value, Measurements, Nonrecurring | Home Equity and Second Mortgage
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans $ 300 $ 7