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Assets Measured at Fair Value on Recurring and Nonrecurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total foreclosed real estate $ 295 $ 661
Fair Value, Measurements, Recurring
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 122,973 111,440
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 23,206 12,220
Fair Value, Measurements, Recurring | Agency Collateralized Mortgage Obligations
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 22,660 23,288
Fair Value, Measurements, Recurring | Agency CMO
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 38,553 42,363
Fair Value, Measurements, Recurring | Municipal Obligations
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 34,317 27,301
Fair Value, Measurements, Recurring | Mutual fund investment
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 4,237 5,388
Fair Value, Measurements, Recurring | Collateralized Mortgage Obligations Issued By Private Enterprise
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale   880
Fair Value, Measurements, Nonrecurring
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 5,931 5,743
Loans held for sale 3,609 2,909
Foreclosed real estate 295  
Total foreclosed real estate   661
Fair Value, Measurements, Nonrecurring | Residential
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 2,157 2,098
Foreclosed real estate 258 453
Fair Value, Measurements, Nonrecurring | Land
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 125 5
Foreclosed real estate 37 35
Fair Value, Measurements, Nonrecurring | Construction
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 403 247
Fair Value, Measurements, Nonrecurring | Commercial Real Estate
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 2,561 2,314
Fair Value, Measurements, Nonrecurring | Real Estate Construction
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 678 992
Fair Value, Measurements, Nonrecurring | Home Equity and Second Mortgage
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 7 87
Foreclosed real estate   173
Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 4,237 5,388
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 4,237 5,388
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 Collateralized Mortgage 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 | 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 | 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 fund investment
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 4,237 5,388
Level 1 | Fair Value, Measurements, Recurring | Collateralized Mortgage Obligations Issued By Private Enterprise
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale   0
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  
Total foreclosed real estate   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
Foreclosed real estate   0
Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 118,736 106,052
Loans held for sale 3,705 2,966
Level 2 | Fair Value, Measurements, Recurring
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 118,736 106,052
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 23,206 12,220
Level 2 | Fair Value, Measurements, Recurring | Agency Collateralized Mortgage Obligations
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 22,660 23,288
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 38,553 42,363
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 34,317 27,301
Level 2 | Fair Value, Measurements, Recurring | Mutual fund investment
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Level 2 | Fair Value, Measurements, Recurring | Collateralized Mortgage Obligations Issued By Private Enterprise
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale   880
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 3,609 2,909
Foreclosed real estate 0  
Total foreclosed real estate   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
Foreclosed real estate   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 Collateralized Mortgage 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 | 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 | 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 fund investment
   
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 | Collateralized Mortgage Obligations Issued By Private Enterprise
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale   0
Level 3 | Fair Value, Measurements, Nonrecurring
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 5,931 5,743
Loans held for sale 0 0
Foreclosed real estate 295  
Total foreclosed real estate   661
Level 3 | Fair Value, Measurements, Nonrecurring | Residential
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 2,157 2,098
Foreclosed real estate 258 453
Level 3 | Fair Value, Measurements, Nonrecurring | Land
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 125 5
Foreclosed real estate 37 35
Level 3 | Fair Value, Measurements, Nonrecurring | Construction
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 403 247
Level 3 | Fair Value, Measurements, Nonrecurring | Commercial Real Estate
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 2,561 2,314
Level 3 | Fair Value, Measurements, Nonrecurring | Real Estate Construction
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 678 992
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 7 87
Foreclosed real estate   $ 173