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Other comprehensive loss - Other Comprehensive Loss and Related Tax Effects (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Other comprehensive loss
Unrealized (loss) gain on investment securities available-for-sale	$ (839)	$ 1,184	$ (3,215)	$ 1,457
Other comprehensive (loss) gain before taxes	(839)	1,184	(3,215)	1,457
Income tax	(176)	415	(677)	510
Other comprehensive (loss) income, net of income taxes	$ (663)	$ 769	$ (2,538)	$ 947

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

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

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