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Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance |  |  | $ 321,673 | $ 509,457
Other comprehensive income (loss) | $ 48 | $ (50) | 184 | 799
Ending Balance | 600,674 | 469,799 | 600,674 | 469,799
Unrealized Net Gains and (Losses) on Securities Available-for- Sale |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance |  |  | (224) | (465)
Other comprehensive income (loss), before reclassifications |  |  | 172 | 230
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 0 | 0
Other comprehensive income (loss) |  |  | 172 | 230
Ending Balance | (52) | (235) | (52) | (235)
Other comprehensive income (loss), before reclassifications, tax |  |  | (115) | (140)
Foreign Currency Translation Adjustments |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance |  |  | 0 | (569)
Other comprehensive income (loss), before reclassifications |  |  | 12 | 569
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 0 | 0
Other comprehensive income (loss) |  |  | 12 | 569
Ending Balance | $ 12 | $ 0 | $ 12 | 0
Other comprehensive income (loss), before reclassifications, tax |  |  |  | $ (348)

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- Definition Amount after tax, before 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 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Amount of tax expense (benefit) allocated to other comprehensive income (loss) before reclassification adjustment from accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 11 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=79507043&loc=d3e39076-109324 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e640-108580 + Details
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