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Summary of significant accounting policies - Other Assets (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($)
Value of common stock | $ | $ 14,793 | $ 14,788
Visa Class A stock |  |
Conversion ratio of common stock | 1.6483 |
Shares to be issued following resolution of Visa litigation | shares | 74,142 |
Visa Class B stock |  |
Shares held | shares | 44,982 |
Value of common stock | $ | $ 2,200 |

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