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Other comprehensive loss - Other Comprehensive Income (Loss) and Related Tax Effects (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Other comprehensive loss
Unrealized gain (loss) on investment securities available-for-sale	$ (381)	$ (1,120)	$ 1,076	$ 1,003
Net gain on the sale of investment securities available-for-sale(1)				(623)
Other comprehensive income gain (loss) before taxes	(381)	(1,120)	1,076	380
Income tax	(133)	(392)	377	133
Other comprehensive income, net of income taxes	$ (248)	$ (728)	$ 699	$ 247

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Amount before tax, after reclassification adjustments of other comprehensive income (loss).

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