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Fair value measurements - Summary of Level 3 financial instruments (Details) - Level 3 - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Fair value measurements |  |
Fair value | $ 545 | $ 2,621
Fair value of collateral | Residential loan |  |
Fair value measurements |  |
Fair value | $ 545 | $ 613
Appraised value, selling cost | 7.00% | 7.00%
Appraised value, weighted average rate | 84.00% | 84.00%
Fair value of collateral | Residential loan | Minimum |  |
Fair value measurements |  |
Appraised value | 69.00% | 71.00%
Fair value of collateral | Residential loan | Maximum |  |
Fair value measurements |  |
Appraised value | 95.00% | 92.00%
Fair value of collateral | Commercial loans |  |
Fair value measurements |  |
Fair value |  | $ 2,008
Appraised value, weighted average rate |  | 75.00%
Fair value of collateral | Commercial loans | Minimum |  |
Fair value measurements |  |
Appraised value |  | 71.00%
Fair value of collateral | Commercial loans | Maximum |  |
Fair value measurements |  |
Appraised value |  | 76.00%

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- Definition Represents the appraised value used as an input to measure fair value, expressed as a percentage. + 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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