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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, 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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