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Other comprehensive income (loss) - Other Comprehensive Income (Loss) and Related Tax Effects (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gain (loss) on investment securities available-for-sale	$ 826	$ (825)	$ 134	$ 2,811
Net gain on the sale of investment securities available-for-sale(1)	(147)	(701)	(979)	(861)
Other comprehensive income (loss) gain before taxes	679	(1,526)	(845)	1,950
Income tax expense (benefit) related to other comprehensive loss	237	(534)	(296)	682
Other comprehensive income (loss)	442	(992)	(549)	1,268
Reclassification Out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gain (loss) on investment securities available-for-sale	826	(825)	134	2,811
Net gain on the sale of investment securities available-for-sale(1)	(147)	(701)	(979)	(861)
Other comprehensive income (loss) gain before taxes	679	(1,526)	(845)	1,950
Income tax expense (benefit) related to other comprehensive loss	237	(534)	(296)	682
Other comprehensive income (loss)	$ 442	$ (992)	$ (549)	$ 1,268

X

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

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