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Other comprehensive loss - Other Comprehensive Loss and Related Tax Effects (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Other comprehensive loss
Unrealized (loss) gain on investment securities available-for-sale	$ 2,439	$ (2,376)
Other comprehensive loss	2,502	(2,376)
Income tax	526	(501)
Other comprehensive loss	$ 1,976	$ (1,875)

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