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Other Comprehensive Income - Summary of Components of OCI (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Equity [Abstract] |  |  |
Net change in fair value recorded in accumulated OCI, Before-tax | $ 32,849 | $ 45,486 | $ (26,435)
Net change in fair value recorded in accumulated OCI, Tax effect | (9,711) | (13,447) | 7,815
Net change in fair value recorded in accumulated OCI, After-tax | 23,138 | 32,039 | (18,620)
Net realized gain reclassified into earnings Before-tax | 0 | (5) | 0
Net realized gain reclassified into earnings Tax effect | 0 | 1 | 0
Net realized gain reclassified into earnings After-tax | 0 | (4) | 0
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, Before-tax | (572) | (1,614) | (2,091)
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, Tax effect | 169 | 477 | 619
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, After-tax | (403) | (1,137) | (1,472)
Net change, Before-tax | 32,277 | 43,867 | (28,526)
Net change, Tax effect | (9,542) | (12,969) | 8,434
Net change, After-tax | $ 22,735 | $ 30,898 | $ (20,092)

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- Definition Amount, before tax and after adjustment, of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 + Details
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