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Other comprehensive loss - Other Comprehensive Income (Loss) and Related Tax Effects (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Other comprehensive loss
Unrealized gain (loss) on investment securities available-for-sale	$ 1,184	$ 1,128	$ 1,457	$ 2,123
Net gain on the sale of investment securities available-for-sale(1)		(381)		(623)
Other comprehensive income gain (loss) before taxes	1,184	747	1,457	1,500
Income tax	415	261	510	525
Other comprehensive income, net of income taxes	$ 769	$ 486	$ 947	$ 975

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

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