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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, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Other comprehensive loss |  |  |  |  |  |  |  |
Unrealized (loss) gain on investment securities available-for-sale | $ 161 |  |  | $ (1,179) |  |  | $ 5,211 | $ (4,394)
Net gain on the sale of investment securities available-for-sale |  |  |  |  |  |  | (23) |
Other comprehensive loss | 314 |  |  | (1,179) |  |  | 5,847 | (4,394)
Income tax | 66 |  |  | (248) |  |  | 1,228 | (925)
Other comprehensive loss | $ 248 | $ 2,395 | $ 1,976 | $ (931) | $ (663) | $ (1,875) | $ 4,619 | $ (3,469)

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