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Other Comprehensive Income - Summary of Components of Other Comprehensive Income (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Equity [Abstract] |  |
Net change in fair value recorded in accumulated OCI, Before-tax | $ (31,338) | $ 1,207
Net change in fair value recorded in accumulated OCI, Tax effect | (9,265) | 507
Net change in fair value recorded in accumulated OCI, After-tax | (22,073) | 700
Amortization of unrealized gain on securities transferred from available-for-sale to held-to-maturity, Before-tax | (832) | (783)
Amortization of unrealized gain on securities transferred from available-for-sale to held-to-maturity, Tax effect | (246) | (329)
Amortization of unrealized gain on securities transferred from available-for-sale to held-to-maturity, After-tax | (586) | (454)
Net change, Before-tax | (32,170) | 424
Net change, Tax effect | (9,511) | 178
Other comprehensive (loss) income, net of tax | $ (22,659) | $ 246

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- Definition Other comprehensive income (loss) amortization of unrealized gain (loss) on securities transferred from available for sale to held to maturity before tax. + References No definition available. + Details
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- Definition Other comprehensive income (loss) amortization of unrealized gain (loss) on securities transferred from available for sale to held to maturity net of tax. + References No definition available. + Details
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- Definition Other comprehensive income (loss) amortization of unrealized gain (loss) on securities transferred from available for sale to held to maturity tax. + References No definition available. + Details
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- Definition Amount before tax, after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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- Definition Amount of tax expense (benefit), after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 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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