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Assets Measured at Fair Value on Recurring and Nonrecurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale $ 112,289 $ 122,973
Fair Value, Measurements, Recurring
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 112,289 122,973
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 18,347 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 21,522 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 34,279 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 35,688 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 2,453 4,237
Fair Value, Measurements, Nonrecurring
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 3,117 5,931
Loans held for sale 700 3,609
Foreclosed real estate 364 295
Fair Value, Measurements, Nonrecurring | Residential
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 1,285 2,157
Foreclosed real estate 331 258
Fair Value, Measurements, Nonrecurring | Land
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 123 125
Foreclosed real estate 33 37
Fair Value, Measurements, Nonrecurring | Construction
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 0 403
Fair Value, Measurements, Nonrecurring | Commercial Real Estate
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 958 2,561
Fair Value, Measurements, Nonrecurring | Real Estate Construction
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 653 678
Fair Value, Measurements, Nonrecurring | Home Equity and Second Mortgage
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 98 7
Level 1
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 2,453 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 2,453 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 2,453 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 109,836 118,736
Loans held for sale 722 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 109,836 118,736
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 18,347 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 21,522 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 34,279 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 35,688 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 700 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 3,117 5,931
Loans held for sale 0 0
Foreclosed real estate 364 295
Level 3 | Fair Value, Measurements, Nonrecurring | Residential
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 1,285 2,157
Foreclosed real estate 331 258
Level 3 | Fair Value, Measurements, Nonrecurring | Land
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 123 125
Foreclosed real estate 33 37
Level 3 | Fair Value, Measurements, Nonrecurring | Construction
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 0 403
Level 3 | Fair Value, Measurements, Nonrecurring | Commercial Real Estate
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 958 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 653 678
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 $ 98 $ 7