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Other Comprehensive Income - Summary of Components of OCI (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Equity [Abstract] |  |  |  |
Net change in fair value recorded in accumulated OCI, Before-tax | $ 19,564 | $ (5,773) | $ 38,914 | $ (37,111)
Net change in fair value recorded in accumulated OCI, Tax effect | (5,784) | 1,707 | (11,504) | 10,972
Net change in fair value recorded in accumulated OCI, After-tax | 13,780 | (4,066) | 27,410 | (26,139)
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, Before-tax | (78) | (825) | (1,201) | (1,657)
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, Tax effect | 23 | 244 | 355 | 490
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, After-tax | (55) | (581) | (846) | (1,167)
Net change, Before-tax | 19,486 | (6,598) | 37,713 | (38,768)
Net change, Tax effect | (5,761) | 1,951 | (11,149) | 11,462
Net change, After-tax | $ 13,725 | $ (4,647) | $ 26,564 | $ (27,306)

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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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