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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		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized gain (loss) on investment securities available-for-sale	$ 1,242	$ (2,744)	$ 3,636	$ (3,220)
Other comprehensive income (loss)	1,082	(2,768)	3,476	(3,345)
Reclassification Out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net gain on the sale of investment securities available-for-sale	(160)	(24)	(160)	(125)
Unrealized gain (loss) on investment securities available-for-sale	1,242	(2,744)	3,636	(3,220)
Other comprehensive income (loss)	1,082	(2,768)	3,476	(3,345)
Income tax expense (benefit)	378	(941)	1,216	1,137
Other comprehensive income (loss)	$ 704	$ (1,827)	$ 2,260	$ (2,208)

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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