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Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Tax effect | $ 1,914 | $ 3,039
Total accumulated other comprehensive loss | (3,551) | (5,644)
Unrealized Gain (Loss) on Securities Available for Sale [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive income (loss), before tax | (3,937) | (6,007)
Unamortized Gain on Securities Held to Maturity, Previously Transferred from AFS [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive income (loss), before tax | 200 | 456
Unrealized Loss on Derivative Instruments [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive income (loss), before tax | $ (1,728) | $ (3,132)

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 3: 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 before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, attributable to parent. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners). + References No definition available. + Details
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