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Off Balance Sheet Activities - Schedule of Off-Balance Sheet Risks (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Commitments to Make Loans [Member] | Fixed Rate [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items]    
Off-balance sheet risks, amount, liability $ 54,556 $ 13,670
Commitments to Make Loans [Member] | Variable Rate [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items]    
Off-balance sheet risks, amount, liability 155,391 171,862
Unused Lines of Credit [Member] | Fixed Rate [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items]    
Off-balance sheet risks, amount, liability 0 0
Unused Lines of Credit [Member] | Variable Rate [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items]    
Off-balance sheet risks, amount, liability 78,937 69,621
Standby Letters of Credit [Member] | Fixed Rate [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items]    
Off-balance sheet risks, amount, liability 0 0
Standby Letters of Credit [Member] | Variable Rate [Member]
    
Fair Value Assets Measured On Recurring Basis Unobservable Input [Line Items]    
Off-balance sheet risks, amount, liability $ 13,520 $ 22,598