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Other comprehensive loss - Other Comprehensive Loss and Related Tax Effects (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Other comprehensive loss |  |  |  |
Unrealized (loss) gain on investment securities available-for-sale | $ (1,179) | $ (381) | $ (4,394) | $ 1,076
Other comprehensive (loss) gain before taxes | (1,179) | (381) | (4,394) | 1,076
Income tax | (248) | (133) | (925) | 377
Other comprehensive (loss) income, net of income taxes | $ (931) | $ (248) | $ (3,469) | $ 699

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