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Other Comprehensive Income (Loss) (Component of Other Comprehensive Income (Loss)) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Equity [Abstract] |  |  |
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Before Tax Amount | $ 157,016 | $ (175,061) | $ (12,450)
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Before Tax Amount | (16,193) | (32,207) | (33,601)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Before Tax Amount | 4,941 | (14,975) | (69)
Total securities available for sale and transferred securities | 145,764 | (222,243) | (46,120)
Change in the net actuarial gain/loss | (597) | 1,914 | (3,877)
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit) | 5,429 | 7,274 | 6,995
Total defined-benefit post-retirement benefit plans | 4,832 | 9,188 | 3,118
Other comprehensive income (loss), before tax | 150,596 | (213,055) | (43,002)
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Tax Expense (Benefit) | 48,626 | (61,271) | (4,358)
Securities available for sale and transferred securities, change in net unrealized gain on securities transfers to held-to-maturity, tax expense benefit | (5,668) | (11,272) | (11,760)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Tax Expense (Benefit) | 1,729 | (5,242) | (24)
Total securities available for sale and transferred securities, Tax Expense (Benefit) | 44,687 | (77,785) | (16,142)
Change in the net actuarial gain/loss, Tax Expense (Benefit) | (126) | 670 | (1,357)
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a componet of net periodic cost benefit , Tax Expense (Benefit) | 1,900 | 2,546 | 2,448
Total defined-benefit post-retirement benefit plans, Tax Expense (Benefit) | 1,774 | 3,216 | 1,091
Total other comprehensive income, Tax Expense (Benefit) | 46,461 | (74,569) | (15,051)
Securities available for sale and transferred securities, change in net unrealized gain/loss during the period, net of tax | 108,390 | (113,790) | (8,092)
Securities available for sale and transferred securities. change in net unrealized gain on securities transfers to held-to-maturity, net of tax | (10,525) | (20,935) | (21,841)
Securities available for sale and securities transferred, reclassification adjustment for net (gains) losses included in net income, net of tax | 3,212 | (9,733) | (45)
Total securities available for sale and transferred securities, net of tax | 101,077 | (144,458) | (29,978)
Change in the net actuarial gain/loss, Net of Tax Amount | (471) | 1,244 | (2,520)
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a componet of net periodic cost (benefit), Net of Tax Amount | 3,529 | 4,728 | 4,547
Total defined-benefit post-retirement benefit plans, Net of Tax Amount | 3,058 | 5,972 | 2,027
Other comprehensive income (loss), net of tax | $ 104,135 | $ (138,486) | $ (27,951)

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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=84228862&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=82897076&loc=d3e27357-111563 + Details
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