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Other comprehensive loss - Other Comprehensive Loss and Related Tax Effects (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Other comprehensive loss |  |  |  |
Unrealized (loss) gain on investment securities available-for-sale | $ 2,611 | $ (839) | $ 5,050 | $ (3,215)
Net gain on the sale of investment securities available-for-sale | (23) |  | (23) |
Other comprehensive loss | 3,031 | (839) | 5,533 | (3,215)
Income tax | 637 | (176) | 1,162 | (677)
Other comprehensive loss | $ 2,394 | $ (663) | $ 4,371 | $ (2,538)

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