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Other Comprehensive Income (Loss) - Summary of Components of OCI (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Equity [Abstract] |  |  |
Net change in fair value recorded in accumulated OCI, Before-tax | $ (26,435) | $ (11,336) | $ (15,792)
Net change in fair value recorded in accumulated OCI, Tax effect | 7,815 | 4,760 | 6,633
Net change in fair value recorded in accumulated OCI, After-tax | (18,620) | (6,576) | (9,159)
Amortization of unrealized (gains)/ losses on securities transferred from available-for-sale to held-to-maturity, Before-tax | (2,091) | (3,293) | (2,174)
Amortization of unrealized (gains)/ losses on securities transferred from available-for-sale to held-to-maturity, Tax effect | 619 | 1,383 | 913
Amortization of unrealized (gains)/ losses on securities transferred from available-for-sale to held-to-maturity, After-tax | (1,472) | (1,910) | (1,261)
Net realized (gain)/loss reclassified into earnings, Before-tax | 0 | (402) | (548)
Net realized (gain)/loss reclassified into earnings, Tax Effect | 0 | 169 | 230
Net realized (gain)/loss reclassified into earnings, After-Tax | 0 | (233) | (318)
Net change, Before-tax | (28,526) | (15,031) | (18,514)
Net change, Tax effect | (8,434) | (6,312) | (7,776)
Net change, After-tax | $ (20,092) | $ (8,719) | $ (10,738)

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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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