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Fair value measurements (Details 3) - Fair Value, Inputs, Level 3 - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
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Sep. 30, 2015 | Dec. 31, 2014
Fair value measurements |  |
Fair value | $ 951 | $ 2,445
Fair value of property or collateral | Residential loan |  |
Fair value measurements |  |
Fair value | $ 823 | $ 2,297
Appraised value, selling cost | 7.00% | 7.00%
Appraised value, weighted average rate (as a percent) | 70.00% | 83.00%
Fair value of property or collateral | Residential loan | Minimum |  |
Fair value measurements |  |
Appraised value (as a percent) | 31.00% | 39.00%
Fair value of property or collateral | Residential loan | Maximum |  |
Fair value measurements |  |
Appraised value (as a percent) | 91.00% | 99.00%
Fair value of property or collateral | Home equity line of credit |  |
Fair value measurements |  |
Fair value | $ 128 | $ 3
Appraised value, selling cost | 7.00% | 7.00%
Appraised value, weighted average rate (as a percent) | 52.00% | 7.00%
Fair value of property or collateral | Commercial loans |  |
Fair value measurements |  |
Fair value |  | $ 145
Fair value, weighted average rate (as a percent) |  | 91.00%
Fair value of property or collateral | Real estate acquired in settlement of loans |  |
Fair value measurements |  |
Fair value | $ 70 | $ 288
Appraised value, selling cost | 7.00% | 7.00%
Appraised value (as a percent) | 100.00% | 100.00%
Appraised value, weighted average rate (as a percent) | 100.00% | 100.00%

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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://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=36462937&loc=d3e19207-110258 + Details
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