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Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance |  |  | $ 605,224 | $ 321,673
Other comprehensive income (loss) | $ 39 | $ 48 | (200) | 136
Ending Balance | 640,366 | 589,333 | 640,366 | 589,333
Unrealized Net Gains and (Losses) on Securities Available-for-Sale |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance |  |  | (612) | (224)
Other comprehensive income (loss), before reclassifications |  |  | (192) | 134
Amounts reclassified from accumulated other comprehensive income (loss), net of tax of ($61) (1) |  |  | 178 |
Other comprehensive income (loss) |  |  | (14) | 134
Ending Balance | (626) | (90) | (626) | (90)
Other comprehensive income (loss), before reclassifications, tax |  |  | 77 | (83)
Reclassification from AOCI, tax |  |  | (61) |
Foreign Currency Translation Adjustments |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning Balance |  |  | 12 | 0
Other comprehensive income (loss), before reclassifications |  |  | (8) | 2
Amounts reclassified from accumulated other comprehensive income (loss), net of tax of ($61) (1) |  |  | 0 |
Other comprehensive income (loss) |  |  | (8) | 2
Ending Balance | $ 4 | $ 2 | 4 | $ 2
Other comprehensive income (loss), before reclassifications, tax |  |  | $ 2 |

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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109228884&loc=d3e1436-108581 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 11 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e39076-109324 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e640-108580 + Details
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