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Other Comprehensive Income - Summary of Components of Other Comprehensive Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Equity [Abstract] |  |  |  |
Net change in fair value recorded in accumulated OCI, Before-tax | $ (10,235) | $ 2,083 | $ (47,346) | $ 6,128
Net change in fair value recorded in accumulated OCI, Tax effect | 3,025 | (875) | 13,997 | (2,574)
Net change in fair value recorded in accumulated OCI, After-tax | (7,210) | 1,208 | (33,349) | 3,554
Amortization of unrealized gains (losses) on securities transferred from available-for-sale to held-to-maturity, Before-tax | (152) | (862) | (1,809) | (2,841)
Amortization of unrealized gains (losses) on securities transferred from available-for-sale to held-to-maturity, Tax effect | 45 | 362 | 535 | 1,193
Amortization of unrealized gains (losses) on securities transferred from available-for-sale to held-to-maturity, After-tax | (107) | (500) | (1,274) | (1,648)
Net realized gain reclassified into earnings, Before-tax | 0 | 0 | 0 | (402)
Net realized gain reclassified into earnings, Tax Effect | 0 | 0 | 0 | 169
Net realized gain reclassified into earnings, After-Tax | 0 | 0 | 0 | (233)
Net change, Before-tax | (10,387) | 1,221 | (49,155) | 2,885
Net change, Tax effect | (3,070) | 513 | (14,532) | 1,212
Other comprehensive income (loss), net of tax | $ (7,317) | $ 708 | $ (34,623) | $ 1,673

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 + Details
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