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Fair value estimates - Additional Quantitative Information about Assets Measured at Fair Value on Nonrecurring Basis (Details) - Nonrecurring Fair Value Measurements [Member] - Level 3 - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Impaired Loans |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Assets, Fair Value Estimate | $ 4,549 | $ 4,944
Range and weighted average of appraisal adjustments | 59.70% | 61.70%
Range and weighted average of liquidation expenses | 5.40% | 5.40%
Impaired Loans | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Range and weighted average of appraisal adjustments | 3.60% | 3.30%
Range and weighted average of liquidation expenses | 3.00% | 3.00%
Impaired Loans | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Range and weighted average of appraisal adjustments | 97.00% | 97.00%
Range and weighted average of liquidation expenses | 6.00% | 6.00%
Other Real Estate Owned |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Assets, Fair Value Estimate | $ 1,242 | $ 878
Range and weighted average of appraisal adjustments | 27.90% | 30.30%
Range and weighted average of liquidation expenses | 5.00% | 5.00%
Other Real Estate Owned | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Range and weighted average of appraisal adjustments | 19.80% | 20.00%
Range and weighted average of liquidation expenses | 3.00% | 3.00%
Other Real Estate Owned | Maximum |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Range and weighted average of appraisal adjustments | 77.30% | 77.30%
Range and weighted average of liquidation expenses | 6.00% | 6.00%

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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