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Fair Value of Instruments - Quantitative Information about Unobservable Inputs Used in Recurring and Nonrecurring Level 3 Fair Value Measurements (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
U.S. Government agency [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value at June 30, 2014 $ 8,074 $ 10,346
Valuation Technique Discounted Cash Flow Discounted Cash Flow
Unobservable Inputs Credit strength of underlying project or entity / Discount rate Credit strength of underlying project or entity / Discount rate
Impaired loans [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value at June 30, 2014 1,587 1,924
Valuation Technique Collateral based measurements Collateral based measurements
Unobservable Inputs Discount to reflect current market conditions and ultimate collectability Discount to reflect current market conditions and ultimate collectability
Other real estate owned residential mortgages [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value at June 30, 2014 734 964
Valuation Technique Appraisals Appraisals
Unobservable Inputs Discount to reflect current market Discount to reflect current market
Commercial Real Estate [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value at June 30, 2014 $ 807 $ 1,127
Valuation Technique Appraisals Appraisals
Unobservable Inputs Discount to reflect current market Discount to reflect current market
Minimum [Member] | U.S. Government agency [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Weighted Average 0.00% 0.00%
Minimum [Member] | Impaired loans [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Weighted Average 0.00% 0.00%
Minimum [Member] | Other real estate owned residential mortgages [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Weighted Average 0.00% 0.00%
Minimum [Member] | Commercial Real Estate [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Weighted Average 0.00% 0.00%
Maximum [Member] | U.S. Government agency [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Weighted Average 5.00% 5.00%
Maximum [Member] | Impaired loans [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Weighted Average 50.00% 50.00%
Maximum [Member] | Other real estate owned residential mortgages [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Weighted Average 20.00% 20.00%
Maximum [Member] | Commercial Real Estate [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Weighted Average 20.00% 20.00%