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Other comprehensive income (loss) - Other Comprehensive Income (Loss) and Related Tax Effects (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Other comprehensive income (loss) |  |
Unrealized gain (loss) on investment securities available-for-sale | $ 273 | $ 995
Net gain on the sale of investment securities available-for-sale(1) |  | (242)
Other comprehensive income gain (loss) before taxes | 273 | 753
Income tax | 96 | 264
Other comprehensive income, net of income taxes | $ 177 | $ 489

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