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Other Comprehensive Income - Summary of Components of Other Comprehensive Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Equity [Abstract] |  |  |  |
Net change in fair value recorded in accumulated OCI, Before-tax | $ (5,773) | $ 2,838 | $ (37,111) | $ 4,045
Net change in fair value recorded in accumulated OCI, Tax effect | 1,707 | (1,192) | 10,972 | (1,699)
Net change in fair value recorded in accumulated OCI, After-tax | (4,066) | 1,646 | (26,139) | 2,346
Amortization of unrealized (gains) losses on securities transferred from available-for-sale to held-to-maturity, Before-tax | (825) | (1,196) | (1,657) | (1,979)
Amortization of unrealized (gains) losses on securities transferred from available-for-sale to held-to-maturity, Tax effect | 244 | 502 | 490 | 831
Amortization of unrealized (gains) losses on securities transferred from available-for-sale to held-to-maturity, After-tax | (581) | (694) | (1,167) | (1,148)
Net realized gain reclassified into earnings, Before-tax | 0 | (402) | 0 | (402)
Net realized gain reclassified into earnings, Tax Effect | 0 | 169 | 0 | 169
Net realized gain reclassified into earnings, After-Tax | 0 | (233) | 0 | (233)
Net change, Before-tax | (6,598) | 1,240 | (38,768) | 1,664
Net change, Tax effect | 1,951 | (521) | 11,462 | (699)
Other comprehensive income (loss), net of tax | $ (4,647) | $ 719 | $ (27,306) | $ 965

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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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