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Disclosures about fair value of assets and liabilities (Details Textual) (USD $)	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Disclosures About Fair Value of Assets and Liabilities (Textual) [Abstract]
Fair value adjustments on impaired loans	$ 1,900,000	$ 1,900,000
Increase in carrying amount of mortgage servicing rights	33,000
Reduction in carrying amount of mortgage servicing rights	$ 1,000,000

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- Definition

Fair value adjustments on impaired loans.

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- Definition

Increase in carrying amount of mortgage servicing rights.

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Reduction in carrying amount of mortgage servicing rights.

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