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Other comprehensive income (loss) - Other Comprehensive Income (Loss) and Related Tax Effects (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gain (loss) on investment securities available-for-sale	$ (1,459)	$ 1,242	$ (692)	$ 3,636
Net gain on the sale of investment securities available-for-sale		(160)	(832)	(160)
Other comprehensive income (loss) gain before taxes	(1,459)	1,082	(1,524)	3,476
Income tax expense (benefit)	(510)	378	(533)	1,216
Other comprehensive income (loss)	(949)	704	(991)	2,260
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	(1,459)	1,242	(692)	3,636
Net gain on the sale of investment securities available-for-sale		(160)	(832)	(160)
Other comprehensive income (loss) gain before taxes	(1,459)	1,082	(1,524)	3,476
Income tax expense (benefit)	(510)	378	(533)	1,216
Other comprehensive income (loss)	$ (949)	$ 704	$ (991)	$ 2,260

X

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

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