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Other comprehensive income (loss) - Other Comprehensive Income (Loss) and Related Tax Effects (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gain (loss) on investment securities available-for-sale	$ (825)	$ (20)	$ 2,811	$ (3,240)
Other comprehensive income (loss)	(1,526)	(53)	1,950	(3,398)
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	(825)	(20)	2,811	(3,240)
Net gain on the sale of investment securities available-for-sale	(701)	(33)	(861)	(158)
Other comprehensive income (loss)	(1,526)	(53)	1,950	(3,398)
Income tax expense (benefit)	(534)	(18)	682	(1,155)
Other comprehensive income (loss)	$ (992)	$ (35)	$ 1,268	$ (2,243)

X

- Definition

Amount before tax and reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities and unrealized holding gain (loss) related to transfers of securities into the available-for-sale classification and out of the held-to-maturity classification.

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

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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