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Assets Measured at Fair Value on Recurring and Nonrecurring Basis (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]    
Foreclosed real estate $ 420 $ 661
Fair Value, Measurements, Recurring
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 123,375 111,440
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 22,551 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 24,357 23,288
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 657 880
Fair Value, Measurements, Recurring | Agency CMO
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 42,448 42,363
Fair Value, Measurements, Recurring | Municipal Notes
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 30,061 27,301
Fair Value, Measurements, Recurring | Mutual Funds
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 3,301 5,388
Fair Value, Measurements, Recurring | Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 3,301 5,388
Fair Value, Measurements, Recurring | Level 1 | Agency mortgage-backed securities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Fair Value, Measurements, Recurring | Level 1 | Agency Collateralized Mortgage Obligations
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Fair Value, Measurements, Recurring | Level 1 | 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 0
Fair Value, Measurements, Recurring | Level 1 | Agency CMO
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Fair Value, Measurements, Recurring | Level 1 | Municipal Notes
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Fair Value, Measurements, Recurring | Level 1 | Mutual Funds
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 3,301 5,388
Fair Value, Measurements, Recurring | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 120,074 106,052
Fair Value, Measurements, Recurring | Level 2 | Agency mortgage-backed securities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 22,551 12,220
Fair Value, Measurements, Recurring | Level 2 | Agency Collateralized Mortgage Obligations
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 24,357 23,288
Fair Value, Measurements, Recurring | Level 2 | Collateralized Mortgage Obligations Issued By Private Enterprise
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 657 880
Fair Value, Measurements, Recurring | Level 2 | Agency CMO
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 42,448 42,363
Fair Value, Measurements, Recurring | Level 2 | Municipal Notes
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 30,061 27,301
Fair Value, Measurements, Recurring | Level 2 | Mutual Funds
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Fair Value, Measurements, Recurring | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Fair Value, Measurements, Recurring | Level 3 | Agency mortgage-backed securities
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Fair Value, Measurements, Recurring | Level 3 | Agency Collateralized Mortgage Obligations
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Fair Value, Measurements, Recurring | Level 3 | 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 0
Fair Value, Measurements, Recurring | Level 3 | Agency CMO
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Fair Value, Measurements, Recurring | Level 3 | Municipal Notes
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Fair Value, Measurements, Recurring | Level 3 | Mutual Funds
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 0 0
Fair Value, Measurements, Nonrecurring
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 6,341 6,107
Loans held for sale 2,306 2,909
Foreclosed real estate 420 661
Fair Value, Measurements, Nonrecurring | Level 1
   
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
Fair Value, Measurements, Nonrecurring | Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 0 0
Loans held for sale 2,306 2,909
Foreclosed real estate 0 0
Fair Value, Measurements, Nonrecurring | Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 6,341 6,107
Loans held for sale 0 0
Foreclosed real estate $ 420 $ 661