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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

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- Definition Amount before tax, after reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669625-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33775-111570 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669619-108580 + Details
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