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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, 2019 | Dec. 31, 2018
Fair value measurements |  |
Fair value | $ 237 | $ 77
Fair value of collateral | Residential loan |  |
Fair value measurements |  |
Fair value | $ 192 |
Appraised value, selling cost | 7.00% |
Fair value of collateral | Commercial loans |  |
Fair value measurements |  |
Fair value | $ 45 |
Fair value of collateral | Home equity line of credit |  |
Fair value measurements |  |
Fair value |  | $ 77
Appraised value, selling cost |  | 7.00%
Fair value of collateral | Real estate acquired in settlement of loans |  |
Fair value measurements |  |
Fair value |  | $ 186
Appraised value, selling cost |  | 7.00%

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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://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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