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Other Comprehensive Income (Loss) - Component of Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Equity [Abstract] |  |  |  |
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Before Tax Amount | $ (95,641) | $ 86,445 | $ 191,865 | $ 7,704
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Before Tax Amount | (7,278) | (8,831) | (24,629) | (24,925)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Before Tax Amount | 37 | 52 | (14,866) | (176)
Total securities available for sale and transferred securities, before tax amount | (102,882) | 77,666 | 152,370 | (17,397)
Defined-benefit post-retirement benefit plans, Change in the net actuarial gain/loss, Before Tax Amount | 1,585 | 1,748 | 4,691 | 5,246
Remeasurement of projected benefit obligation related to SERP | 0 | 0 | (862) | 0
Reclassification adjustment for SERP settlement costs included in net income, before tax amount | 0 | 0 | 187 | 0
Total defined-benefit post-retirement benefit plans | 1,585 | 1,748 | 4,016 | 5,246
Total other comprehensive income (loss), before tax | (101,297) | 79,414 | 156,386 | (12,151)
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Tax Expense (Benefit) | (33,473) | 30,256 | 67,154 | 2,697
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Tax Expense (Benefit) | (2,547) | (3,091) | (8,620) | (8,724)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Tax Expense (Benefit) | 12 | 18 | (5,204) | (62)
Total securities available for sale and transferred securities, Tax Expense (Benefit) | (36,008) | 27,183 | 53,330 | (6,089)
Defined-benefit post-retirement benefit plans, Change in the net actuarial gain/loss, Tax Expense (Benefit) | 555 | 612 | 1,642 | 1,836
Remeasurement of projected benefit obligation related to SERP, Tax | 0 | 0 | (302) | 0
Reclassification adjustment for SERP settlement costs included in net income, tax expense (benefit) amount | 0 | 0 | 66 | 0
Total defined-benefit post-retirement benefit plans, Tax Expense (Benefit) | 555 | 612 | 1,406 | 1,836
Total other comprehensive income (loss), Tax Expense (Benefit) | (35,453) | 27,795 | 54,736 | (4,253)
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Net of Tax | (62,168) | 56,189 | 124,711 | 5,007
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Net of Tax | (4,731) | (5,740) | (16,009) | (16,201)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Net of Tax | 25 | 34 | (9,662) | (114)
Total securities available for sale and transferred securities, Net of Tax | (66,874) | 50,483 | 99,040 | (11,308)
Defined-benefit post-retirement benefit plans, Change in the net actuarial gain/lloss, Net of Tax | 1,030 | 1,136 | 3,049 | 3,410
Remeasurement of projected benefit obligation related to SERP, Net of Tax | 0 | 0 | (560) | 0
Reclassification adjustment for SERP settlement costs included in net income, net of tax amount | 0 | 0 | 121 | 0
Total defined-benefit post-retirement benefit plans, Net of Tax Amount | 1,030 | 1,136 | 2,610 | 3,410
Other comprehensive income (loss), net of tax | $ (65,844) | $ 51,619 | $ 101,650 | $ (7,898)

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