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Other comprehensive income (loss) - Other Comprehensive Income (Loss) and Related Tax Effects (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Other comprehensive income (loss) |  |
Unrealized gain (loss) on investment securities available-for-sale | $ 995 | $ 767
Net gain on the sale of investment securities available-for-sale(1) | (242) | (832)
Other comprehensive income (loss) gain before taxes | 753 | (65)
Income tax expense (benefit) related to other comprehensive loss | 264 | (23)
Other comprehensive income (loss) | $ 489 | $ (42)

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