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Other comprehensive loss - Other Comprehensive Loss and Related Tax Effects (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Other comprehensive loss
Unrealized (loss) gain on investment securities available-for-sale	$ (1,179)	$ (381)	$ (4,394)	$ 1,076
Other comprehensive (loss) gain before taxes	(1,179)	(381)	(4,394)	1,076
Income tax	(248)	(133)	(925)	377
Other comprehensive (loss) income, net of income taxes	$ (931)	$ (248)	$ (3,469)	$ 699

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

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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