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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, 2018 | Dec. 31, 2017
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Other real estate owned |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Assets, Fair Value Estimate | $ 342 | $ 216
Range and weighted average of appraisal adjustments | 31.80% | 30.70%
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 | 26.00% | 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 | 73.30% | 41.30%
Range and weighted average of liquidation expenses | 6.00% | 6.00%
Impaired loans |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Assets, Fair Value Estimate | $ 3,003 | $ 3,424
Range and weighted average of appraisal adjustments | 55.90% | 67.20%
Range and weighted average of liquidation expenses | 4.90% | 4.90%
Impaired loans | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Range and weighted average of appraisal adjustments | 1.30% | 4.00%
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 | 97.00% | 97.00%
Range and weighted average of liquidation expenses | 6.00% | 6.00%

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- Definition Represents the range and weighted average of appraisal adjustments presented as a percent of the appraisal. + References No definition available. + Details
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- Definition Represents the range and weighted average of liquidation expenses presented as a percent of the appraisal. + References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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