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Fair Value - Quantitative Information about Level 3 Fair Value Measurements for Financial Instruments Measured at Fair Value on Non Recurring Basis (Detail) - Sales Comparison Valuation Technique [Member] - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
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Impaired Loans - Commercial Mortgages [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | $ 2,246 | $ 2,353
Impaired Loans - Commercial, Industrial, and Agricultural [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair value | $ 2,668 | $ 2,820
Minimum [Member] | Impaired Loans - Commercial Mortgages [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Sales comparison approach | 32.00% | 34.00%
Minimum [Member] | Impaired Loans - Commercial, Industrial, and Agricultural [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Sales comparison approach |  | 8.00%
Maximum [Member] | Impaired Loans - Commercial Mortgages [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Sales comparison approach | 100.00% | 100.00%
Maximum [Member] | Impaired Loans - Commercial, Industrial, and Agricultural [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Sales comparison approach | 4.00% | 49.00%
Weighted Average [Member] | Impaired Loans - Commercial Mortgages [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Sales comparison approach | (47.00%) | (44.00%)
Weighted Average [Member] | Impaired Loans - Commercial, Industrial, and Agricultural [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Sales comparison approach |  | (13.00%)

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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