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Fair value measurements - Quantitative Information About Level 3 Fair Value Measurements (Details) - Level 3 - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Home equity line of credit | Fair value of property or collateral |  |
Fair value measurements |  |
Fair value | $ 77 |
Selling cost | 7.00% |
Loans |  |
Fair value measurements |  |
Fair value | $ 77 | $ 2,621
Real estate acquired in settlement of loans | Fair value of property or collateral |  |
Fair value measurements |  |
Fair value | $ 186 |
Selling cost | 7.00% |
Residential loan | Fair value of collateral |  |
Fair value measurements |  |
Fair value |  | $ 613
Selling cost |  | 7.00%
Residential loan | Fair value of collateral | Minimum |  |
Fair value measurements |  |
Appraised value |  | 71.00%
Residential loan | Fair value of collateral | Maximum |  |
Fair value measurements |  |
Appraised value |  | 92.00%
Residential loan | Fair value of collateral | Weighted Average |  |
Fair value measurements |  |
Appraised value, weighted average rate |  | 84.00%
Commercial | Fair value of property or collateral | Weighted Average |  |
Fair value measurements |  |
Appraised value, weighted average rate |  | 75.00%
Commercial | Fair value of collateral |  |
Fair value measurements |  |
Fair value |  | $ 2,008
Commercial | Fair value of collateral | Minimum |  |
Fair value measurements |  |
Appraised value |  | 71.00%
Commercial | Fair value of collateral | 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://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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