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Fair Value of Financial Instruments - Balances of Impaired Loans and Foreclosed Assets Measured at Fair Value on Nonrecurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Non-Recurring Fair Value Measurements [Member] | Impaired Loans [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets measured at fair value $ 1,983 $ 11,358
Non-Recurring Fair Value Measurements [Member] | Foreclosed Property and Other Real Estate [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets measured at fair value 1,866 5,832
Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets measured at fair value 0  
Level 1 [Member] | Non-Recurring Fair Value Measurements [Member] | Impaired Loans [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets measured at fair value 0   
Level 1 [Member] | Non-Recurring Fair Value Measurements [Member] | Foreclosed Property and Other Real Estate [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets measured at fair value 0   
Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets measured at fair value 69  
Level 2 [Member] | Non-Recurring Fair Value Measurements [Member] | Impaired Loans [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets measured at fair value 0   
Level 2 [Member] | Non-Recurring Fair Value Measurements [Member] | Foreclosed Property and Other Real Estate [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets measured at fair value 0   
Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets measured at fair value 0  
Level 3 [Member] | Non-Recurring Fair Value Measurements [Member] | Impaired Loans [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets measured at fair value 1,983 11,358
Level 3 [Member] | Non-Recurring Fair Value Measurements [Member] | Foreclosed Property and Other Real Estate [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial assets measured at fair value $ 1,866 $ 5,832