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Other comprehensive loss - Other Comprehensive Loss and Related Tax Effects (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other comprehensive loss
Unrealized (loss) gain on investment securities available-for-sale	$ (2,376)	$ 273
Other comprehensive (loss) gain before taxes	(2,376)	273
Income tax	(501)	96
Other comprehensive (loss) income, net of income taxes	$ (1,875)	$ 177

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

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