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Investment securities - Additional Information (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($)
Value of common stock | $ | $ 14,798 | $ 14,793
Visa Class A stock |  |
Conversion ratio of common stock | 1.6298 |
Shares to be issued following resolution of Visa litigation | 73,312 |
Visa Class B stock |  |
Shares held | 44,982 |

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