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Other Comprehensive Income (Loss) - Component of Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Equity [Abstract] |  |
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Before Tax Amount | $ 33,811 | $ 122,218
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Before Tax Amount | (6,286) | (8,166)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Before Tax Amount | 0 | (14,903)
Total securities available for sale and transferred securities, before tax amount | 27,525 | 99,149
Reclassification adjustment for net amortization of actuarial gain/loss included in net income, before tax amount | 1,357 | 1,553
Total defined-benefit post-retirement benefit plans | 1,357 | 1,553
Total other comprehensive income (loss), before tax | 28,882 | 100,702
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Tax Expense (Benefit) | 11,834 | 42,776
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Tax Expense (Benefit) | (2,200) | (2,858)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Tax Expense (Benefit) | 0 | (5,216)
Total securities available for sale and transferred securities, Tax Expense (Benefit) | 9,634 | 34,702
Reclassification adjustment for net amortization of actuarial gain/loss included in net income, Tax Expense (Benefit) | 475 | 544
Total defined-benefit post-retirement benefit plans, Tax Expense (Benefit) | 475 | 544
Total other comprehensive income (loss), Tax Expense (Benefit) | 10,109 | 35,246
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Net of Tax | 21,977 | 79,442
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Net of Tax | (4,086) | (5,308)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Net of Tax | 0 | (9,687)
Total securities available for sale and transferred securities, Net of Tax | 17,891 | 64,447
Reclassification adjustment for net amortization of actuarial gain/lloss included in net income, Net of Tax | 882 | 1,009
Total defined-benefit post-retirement benefit plans, Net of Tax Amount | 882 | 1,009
Other comprehensive income (loss), net of tax | $ 18,773 | $ 65,456

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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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