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Fair Value of Financial Instruments - Impaired Loans and Other Real Estate (Detail) (Fair Value on Nonrecurring Basis [Member], USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Change in fair value of assets $ (589) $ (1,096)
Impaired loans [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis, total 1,924 3,726
Change in fair value of assets (525) (820)
Other real estate owned - residential mortgages [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis, total 964 783
Change in fair value of assets    (62)
Other real estate owned - commercial [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis, total 1,127 1,526
Change in fair value of assets (64) (214)
Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis, total     
Level 1 [Member] | Impaired loans [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis, total      
Level 1 [Member] | Other real estate owned - residential mortgages [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis, total      
Level 1 [Member] | Other real estate owned - commercial [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis, total      
Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis, total     
Level 2 [Member] | Impaired loans [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis, total      
Level 2 [Member] | Other real estate owned - residential mortgages [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis, total      
Level 2 [Member] | Other real estate owned - commercial [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis, total      
Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis, total     
Level 3 [Member] | Impaired loans [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis, total 1,924 3,726
Level 3 [Member] | Other real estate owned - residential mortgages [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis, total 964 783
Level 3 [Member] | Other real estate owned - commercial [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis, total $ 1,127 $ 1,526