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Other Comprehensive Income - Summary of Components of OCI (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Equity [Abstract] |  |  |
Net change in fair value recorded in accumulated OCI, Before-tax | $ 45,486 | $ (26,435) | $ (11,336)
Net change in fair value recorded in accumulated OCI, Tax effect | (13,447) | 7,815 | 4,760
Net change in fair value recorded in accumulated OCI, After-tax | 32,039 | (18,620) | (6,576)
Net realized gain reclassified into earnings Before-tax | (5) | 0 | (402)
Net realized gain reclassified into earnings Tax effect | 1 | 0 | 169
Net realized gain reclassified into earnings After-tax | (4) | 0 | (233)
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, Before-tax | (1,614) | (2,091) | (3,293)
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, Tax effect | 477 | 619 | 1,383
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, After-tax | (1,137) | (1,472) | (1,910)
Net change, Before-tax | 43,867 | (28,526) | (15,031)
Net change, Tax effect | (12,969) | 8,434 | 6,312
Net change, After-tax | $ 30,898 | $ (20,092) | $ (8,719)

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