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Fair Value of Instruments - Impaired Loans and Other Real Estate (Detail) (Fair Value on Nonrecurring Basis [Member], USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
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 $ 1,434 $ 1,924
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 618 964
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 646 1,127
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 0 0
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 0 0
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 0 0
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 0 0
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 0 0
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 0 0
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 1,434 1,924
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 618 964
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 $ 646 $ 1,127