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Fair value estimates - Schedule of Assets and Liabilities Measured at Fair Value on Nonrecurring Basis (Details) - Nonrecurring Basis - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Impaired loans | $ 3,289 | $ 3,424
Other real estate owned | 673 | 216
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Impaired loans | 3,289 | 3,424
Other real estate owned | $ 673 | $ 216

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- Definition Fair value disclosure of other real estate owned at the end of the period. + References No definition available. + Details
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