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Other Comprehensive Income (Loss) (Component of Other Comprehensive Income (Loss)) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Equity [Abstract] |  |  |
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Before Tax Amount | $ (175,061) | $ (12,450) | $ 103,044
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Before Tax Amount | (32,207) | (33,601) | (35,441)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Before Tax Amount | (14,975) | (69) | (38)
Total securities available for sale and transferred securities | (222,243) | (46,120) | 67,565
Change in the net actuarial gain/loss | 1,914 | (3,877) | (37,524)
Reclassification adjustment for net amortization of actuarial gain(loss) and for SERP settlement costs included in net income, before tax amount | 7,274 |  |
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit) |  | 6,995 | 2,687
Total defined-benefit post-retirement benefit plans | 9,188 | 3,118 | (34,837)
Derivatives, Reclassification adjustments for (gains) losses included in net income, Interest rate swaps on variable-rate loans, Before Tax Amount | 0 | 0 | (30,604)
Other comprehensive income (loss), before tax | (213,055) | (43,002) | 2,124
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Tax Expense (Benefit) | (61,271) | (4,358) | 36,065
Securities available for sale and transferred securities, change in net unrealized gain on securities transfers to held-to-maturity, tax expense benefit | (11,272) | (11,760) | (12,404)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Tax Expense (Benefit) | (5,242) | (24) | (13)
Total securities available for sale and transferred securities, Tax Expense (Benefit) | (77,785) | (16,142) | 23,648
Change in the net actuarial gain/loss, Tax Expense (Benefit) | 670 | (1,357) | (13,133)
Reclassification adjustment for net amortization of actuarial gain(loss) and for SERP settlement costs included in net income, Tax Expense (Benefit) | 2,546 |  |
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a componet of net periodic cost benefit , Tax Expense (Benefit) |  | 2,448 | 940
Total defined-benefit post-retirement benefit plans, Tax Expense (Benefit) | 3,216 | 1,091 | (12,193)
Derivatives, Reclassification adjustments for (gains) losses included in net income, Interest rate swaps on variable-rate loans, Tax Expense (Benefit) |  |  | (10,711)
Total other comprehensive income, Tax Expense (Benefit) | (74,569) | (15,051) | 744
Securities available for sale and transferred securities, change in net unrealized gain/loss during the period, net of tax | (113,790) | (8,092) | 66,979
Securities available for sale and transferred securities. change in net unrealized gain on securities transfers to held-to-maturity, net of tax | (20,935) | (21,841) | (23,037)
Securities available for sale and securities transferred, reclassification adjustment for net (gains) losses included in net income, net of tax | (9,733) | (45) | (25)
Total securities available for sale and transferred securities, net of tax | (144,458) | (29,978) | 43,917
Change in the net actuarial gain/loss, Net of Tax Amount | 1,244 | (2,520) | (24,391)
Reclassification adjustment for net amortization of actuarial gain (loss) and for SERP settlement costs included in net income, Net of Tax Amount | 4,728 |  |
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 |  | 4,547 | 1,747
Total defined-benefit post-retirement benefit plans, Net of Tax Amount | 5,972 | 2,027 | (22,644)
Derivatives, reclassification adjustment for (gains) losses included in net income, interest rate swaps on variable-rate loans, net of tax |  |  | (19,893)
Other comprehensive income (loss), net of tax | $ (138,486) | $ (27,951) | $ 1,380

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- Definition Amount of tax expense (benefit) before reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e,f) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 + Details
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