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Other Comprehensive Income (Loss) - Component of Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Equity [Abstract] |  |
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Before Tax Amount | $ 122,218 | $ 34,527
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Before Tax Amount | (8,166) | (7,887)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Before Tax Amount | (14,903) | (228)
Total securities available for sale and transferred securities, before tax amount | 99,149 | 26,412
Defined-benefit post-retirement benefit plans, Change in the net actuarial gain/loss, Before Tax Amount | 1,553 | 1,749
Total other comprehensive income (loss), before tax | 100,702 | 28,161
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Tax Expense (Benefit) | 42,776 | 12,084
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Tax Expense (Benefit) | (2,858) | (2,760)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Tax Expense (Benefit) | (5,216) | (80)
Total securities available for sale and transferred securities, Tax Expense (Benefit) | 34,702 | 9,244
Defined-benefit post-retirement benefit plans, Change in the net actuarial gain/loss, Tax Expense (Benefit) | 544 | 612
Total other comprehensive income (loss), Tax Expense (Benefit) | 35,246 | 9,856
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Net of Tax | 79,442 | 22,443
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Net of Tax | (5,308) | (5,127)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Net of Tax | (9,687) | (148)
Total securities available for sale and transferred securities, Net of Tax | 64,447 | 17,168
Defined-benefit post-retirement benefit plans, Change in the net actuarial gain/lloss, Net of Tax | 1,009 | 1,137
Other comprehensive income (loss), net of tax | $ 65,456 | $ 18,305

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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=36458714&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=27724398&loc=d3e27357-111563 + Details
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