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Fair value estimates - Additional Quantitative Information about Assets Measured at Fair Value on Nonrecurring Basis (Details) - Level 3 - Nonrecurring Basis - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Other real estate owned |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Assets, Fair Value Estimate | $ 358 | $ 371
Range and weighted average of appraisal adjustments | 26.90% | 43.10%
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 | 25.00% | 25.00%
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 | 38.20% | 54.60%
Range and weighted average of liquidation expenses | 6.00% | 6.00%
Impaired loans |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Assets, Fair Value Estimate | $ 1,613 | $ 3,193
Range and weighted average of appraisal adjustments | 77.30% | 74.50%
Range and weighted average of liquidation expenses | 4.80% | 5.30%
Impaired loans | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Range and weighted average of appraisal adjustments | 5.90% | 18.00%
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 | 98.20% | 97.00%
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=66048111&loc=d3e19207-110258 + Details
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