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Fair Value (Details 5) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Impaired loans - commercial mortgages [Member]
Quantitative information about level 3 fair value measurements for financial instruments measured at fair on non recurring basis
Fair value	$ 8,256	$ 8,422
Impaired loans - commercial mortgages [Member] | Maximum [Member] | Sales Comparison Valuation Technique [Member]
Quantitative information about level 3 fair value measurements for financial instruments measured at fair on non recurring basis
Sales comparison approach	39.00%	39.00%
Impaired loans - commercial mortgages [Member] | Minimum [Member] | Sales Comparison Valuation Technique [Member]
Quantitative information about level 3 fair value measurements for financial instruments measured at fair on non recurring basis
Sales comparison approach	1.00%	1.00%
Impaired loans - commercial mortgages [Member] | Weighted Average [Member] | Sales Comparison Valuation Technique [Member]
Quantitative information about level 3 fair value measurements for financial instruments measured at fair on non recurring basis
Sales comparison approach	19.00%	19.00%
Impaired loans - commercial, industrial, and agricultural [Member]
Quantitative information about level 3 fair value measurements for financial instruments measured at fair on non recurring basis
Fair value	1,661	1,973
Impaired loans - commercial, industrial, and agricultural [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]
Quantitative information about level 3 fair value measurements for financial instruments measured at fair on non recurring basis
Income approach	32.00%	38.00%
Impaired loans - commercial, industrial, and agricultural [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]
Quantitative information about level 3 fair value measurements for financial instruments measured at fair on non recurring basis
Income approach	27.00%	24.00%
Impaired loans - commercial, industrial, and agricultural [Member] | Weighted Average [Member] | Income Approach Valuation Technique [Member]
Quantitative information about level 3 fair value measurements for financial instruments measured at fair on non recurring basis
Income approach	28.00%	27.00%
Impaired loans - residential real estate [Member]
Quantitative information about level 3 fair value measurements for financial instruments measured at fair on non recurring basis
Fair value	$ 165	$ 402
Impaired loans - residential real estate [Member] | Maximum [Member] | Sales Comparison Valuation Technique [Member]
Quantitative information about level 3 fair value measurements for financial instruments measured at fair on non recurring basis
Sales comparison approach	26.00%	15.00%
Impaired loans - residential real estate [Member] | Minimum [Member] | Sales Comparison Valuation Technique [Member]
Quantitative information about level 3 fair value measurements for financial instruments measured at fair on non recurring basis
Sales comparison approach	17.00%	10.00%
Impaired loans - residential real estate [Member] | Weighted Average [Member] | Sales Comparison Valuation Technique [Member]
Quantitative information about level 3 fair value measurements for financial instruments measured at fair on non recurring basis
Sales comparison approach	23.00%	11.00%

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Fair value valuation techniques changes in operating income expectations.

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Fair value valuation techniques negative adjustments for market conditions.

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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.

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