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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Equity [Abstract] |  |  |
Net change in fair value recorded in accumulated OCI, Before-tax | $ (15,792) | $ (22,667) | $ 69,661
Net change in fair value recorded in accumulated OCI, Tax effect | (6,633) | (9,519) | 29,256
Net change in fair value recorded in accumulated OCI, After-tax | (9,159) | (13,148) | 40,405
Cumulative-effect adjustment for unrealized gains on securities transferred from available-for-sale to held-to-maturity, Before-tax | 0 | 6,690 | 0
Cumulative-effect adjustment for unrealized gains on securities transferred from available-for-sale to held-to-maturity, Tax effect | 0 | 2,808 | 0
Cumulative-effect adjustment for unrealized gains on securities transferred from available-for-sale to held-to-maturity, After-tax | 0 | 3,882 | 0
Amortization of unrealized (gains)/losses on securities transferred from available-for-sale to held-to-maturity, Before-tax | (2,174) | (1,573) | 0
Amortization of unrealized (gains)/losses on securities transferred from available-for-sale to held-to-maturity, Tax effect | (913) | (660) | 0
Amortization of unrealized (gains)/losses on securities transferred from available-for-sale to held-to-maturity, After-tax | (1,261) | (913) | 0
Net realized (gain)/loss reclassified into earnings, Before-tax | (548) | 22 | 0
Net realized (gain)/loss reclassified into earnings, Tax Effect | (230) | 9 | 0
Net realized (gain)/loss reclassified into earnings, After-Tax | (318) | 13 | 0
Net change, Before-tax | (18,514) | (17,528) | 69,661
Net change, Tax effect | (7,776) | (7,362) | 29,256
Net change, After-tax | $ (10,738) | $ (10,166) | $ 40,405

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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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