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Other Comprehensive Income - Summary of Components of Other Comprehensive Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Equity [Abstract] |  |  |  |
Net change in fair value recorded in accumulated OCI, Before-tax | $ 2,083 | $ (4,006) | $ 6,128 | $ 31,617
Net change in fair value recorded in accumulated OCI, Tax effect | 875 | (1,683) | 2,574 | 13,279
Net change in fair value recorded in accumulated OCI, After-tax | 1,208 | (2,323) | 3,554 | 18,338
Amortization of unrealized gain (loss) on securities transferred from available-for-sale to held-to-maturity, Before-tax | (862) | 297 | (2,841) | (563)
Amortization of unrealized gain (loss) on securities transferred from available-for-sale to held-to-maturity, Tax effect | (362) | 125 | (1,193) | (237)
Amortization of unrealized gain (loss) on securities transferred from available-for-sale to held-to-maturity, After-tax | (500) | 172 | (1,648) | (326)
Net realized gain reclassified into earnings, Before-tax | 0 | (548) | (402) | (548)
Net realized gain reclassified into earnings, Tax Effect | 0 | (230) | (169) | (230)
Net realized gain reclassified into earnings, After-Tax | 0 | (318) | (233) | (318)
Net Change, Before-tax | 1,221 | (4,257) | 2,885 | 30,506
Net Change, Tax effect | 513 | (1,788) | 1,212 | 12,812
Other comprehensive income, net of tax | $ 708 | $ (2,469) | $ 1,673 | $ 17,694

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 + Details
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