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Other comprehensive loss - Other Comprehensive Income (Loss) and Related Tax Effects (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Other comprehensive loss |  |  |  |
Unrealized gain (loss) on investment securities available-for-sale | $ (381) | $ (1,120) | $ 1,076 | $ 1,003
Net gain on the sale of investment securities available-for-sale(1) |  |  |  | (623)
Other comprehensive income gain (loss) before taxes | (381) | (1,120) | 1,076 | 380
Income tax | (133) | (392) | 377 | 133
Other comprehensive income, net of income taxes | $ (248) | $ (728) | $ 699 | $ 247

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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=84228862&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=66022249&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=84228862&loc=SL7669619-108580 + Details
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