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Disclosures about fair value of assets and liabilities (Details Textual) (USD $) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2013 | Dec. 31, 2012
Disclosures About Fair Value of Assets and Liabilities (Textual) [Abstract] |  |
Fair value adjustments on impaired loans | $ 2,400,000 | $ 1,900,000
Increase in carrying amount of mortgage servicing rights | $ 135,000 | $ 64,000

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