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Fair value estimates - Additional Quantitative Information about Assets Measured at Fair Value on Nonrecurring Basis (Details) - Level 3 - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Other real estate owned |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Valuation Techniques | Appraisal of collateral | Appraisal of collateral
Liquidation expenses | Liquidation expenses | Liquidation expenses
Other real estate owned | Nonrecurring Basis |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Assets, Fair Value Estimate | $ 673 | $ 216
Range and weighted average of appraisal adjustments | 30.70% | 30.70%
Range and weighted average of liquidation expenses | 5.00% | 5.00%
Other real estate owned | Minimum | Nonrecurring Basis |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Range and weighted average of appraisal adjustments | 20.00% | 25.00%
Range and weighted average of liquidation expenses | 3.00% | 3.00%
Other real estate owned | Maximum | Nonrecurring Basis |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Range and weighted average of appraisal adjustments | 55.90% | 41.30%
Range and weighted average of liquidation expenses | 6.00% | 6.00%
Impaired loans |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Valuation Techniques | Appraisal of collateral | Appraisal of collateral
Liquidation expenses | Liquidation expenses | Liquidation expenses
Impaired loans | Nonrecurring Basis |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Assets, Fair Value Estimate | $ 3,289 | $ 3,424
Range and weighted average of appraisal adjustments | 58.50% | 67.20%
Range and weighted average of liquidation expenses | 4.70% | 4.90%
Impaired loans | Minimum | Nonrecurring Basis |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Range and weighted average of appraisal adjustments | 7.70% | 4.00%
Range and weighted average of liquidation expenses | 3.00% | 3.00%
Impaired loans | Maximum | Nonrecurring Basis |  |
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://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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