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Fair value of financial instruments - Additional Quantitative Information about Assets Measured at Fair Value on Nonrecurring Basis (Details) - Nonrecurring Basis - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Other real estate owned |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Range and weighted average of appraisal adjustments | 30.70% | 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 | 41.30% | 54.60%
Range and weighted average of liquidation expenses | 6.00% | 6.00%
Impaired loans |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Range and weighted average of appraisal adjustments | 67.20% | 74.50%
Range and weighted average of liquidation expenses | 4.90% | 5.30%
Impaired loans | Minimum |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Range and weighted average of appraisal adjustments | 4.00% | 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 | 97.00% | 97.00%
Range and weighted average of liquidation expenses | 6.00% | 6.00%
Level 3 | Other real estate owned |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Assets, Fair Value Estimate | $ 216 | $ 371
Valuation Techniques | Appraisal of collateral | Appraisal of collateral
Unobservable Input | Appraisal adjustments | Appraisal adjustments
Liquidation expenses | Liquidation expenses | Liquidation expenses
Level 3 | Impaired loans |  |
Fair Value Inputs, Assets, Quantitative Information |  |
Assets, Fair Value Estimate | $ 3,424 | $ 3,193
Valuation Techniques | Appraisal of collateral | Appraisal of collateral
Unobservable Input | Appraisal adjustments | Appraisal adjustments
Liquidation expenses | Liquidation expenses | Liquidation expenses

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- Definition Fair value disclosure of unobservable input, liquidation expenses, used for assets fair value measurement at the end of the period. + References No definition available. + Details
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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 disclosure of unobservable input used for assets fair value measurement at the end of the period. + References No definition available. + Details
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- Definition The technique used by the entity to measure fair value of assets at the end of the period. + 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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