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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) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Impaired Loans - Commercial Mortgages [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	$ 7,473	$ 8,422
Impaired Loans - Commercial Mortgages [Member] | Minimum [Member] | Sales Comparison Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Sales comparison approach	9.00%	1.00%
Impaired Loans - Commercial Mortgages [Member] | Maximum [Member] | Sales Comparison Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Sales comparison approach	10.00%	39.00%
Impaired Loans - Commercial Mortgages [Member] | Weighted Average [Member] | Sales Comparison Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Sales comparison approach	10.00%	19.00%
Impaired Loans - Commercial, Industrial, and Agricultural [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	1,200	1,973
Impaired Loans - Commercial, Industrial, and Agricultural [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Income approach	13.00%	24.00%
Impaired Loans - Commercial, Industrial, and Agricultural [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Income approach	32.00%	38.00%
Impaired Loans - Commercial, Industrial, and Agricultural [Member] | Weighted Average [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Income approach	23.00%	27.00%
Impaired Loans - Residential Real Estate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	$ 64	$ 402
Impaired Loans - Residential Real Estate [Member] | Minimum [Member] | Sales Comparison Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Sales comparison approach	17.00%	10.00%
Impaired Loans - Residential Real Estate [Member] | Maximum [Member] | Sales Comparison Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Sales comparison approach	26.00%	15.00%
Impaired Loans - Residential Real Estate [Member] | Weighted Average [Member] | Sales Comparison Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Sales comparison approach	23.00%	11.00%

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- Definition

Fair value valuation techniques changes in operating income expectations.

+ References

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- Definition

Fair value valuation techniques negative adjustments for market conditions.

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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.

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