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Assets Measured at Fair Value on Recurring and Nonrecurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Fair Value, Measurements, Recurring
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale $ 116,586 $ 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 21,629 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 22,509 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 34,366 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 33,741 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 4,341 4,237
Fair Value, Measurements, Nonrecurring
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 4,323 5,931
Loans held for sale 4,918 3,609
Foreclosed real estate 557 295
Fair Value, Measurements, Nonrecurring | Residential
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 1,831 2,157
Foreclosed real estate 520 258
Fair Value, Measurements, Nonrecurring | Land
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 124 125
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 260 403
Fair Value, Measurements, Nonrecurring | Commercial Real Estate
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 1,148 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 249 7
Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 4,341 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 4,341 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 4,341 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 112,245 118,736
Loans held for sale 5,008 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 112,245 118,736
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 21,629 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 22,509 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 34,366 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 33,741 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 4,918 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 4,323 5,931
Loans held for sale 0 0
Foreclosed real estate 557 295
Level 3 | Fair Value, Measurements, Nonrecurring | Residential
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 1,831 2,157
Foreclosed real estate 520 258
Level 3 | Fair Value, Measurements, Nonrecurring | Land
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 124 125
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 260 403
Level 3 | Fair Value, Measurements, Nonrecurring | Commercial Real Estate
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 1,148 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 $ 249 $ 7