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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, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Equity [Abstract] |  |  |  |
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Before Tax Amount | $ 86,445 | $ 9,464 | $ 7,704 | $ 76,007
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Before Tax Amount | (8,831) | (8,746) | (24,925) | (27,119)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Before Tax Amount | 52 | (33) | (176) | (35)
Total securities available for sale and transferred securities, Before Tax Amount | 77,666 | 685 | (17,397) | 48,853
Defined-benefit post-retirement benefit plans, Change in the net actuarial gain/loss, Before Tax Amount | 1,748 | 672 | 5,246 | 2,015
Derivatives, Reclassification adjustments for gains on interest rate swaps on variable-rate loans included in net income, Before Tax Amount | 0 | (9,345) | 0 | (28,035)
Total other comprehensive income (loss), before tax | 79,414 | (7,988) | (12,151) | 22,833
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Tax Expense (Benefit) | 30,256 | 3,312 | 2,697 | 26,602
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Tax Expense (Benefit) | (3,091) | (3,061) | (8,724) | (9,492)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Tax Expense (Benefit) | 18 | (12) | (62) | (12)
Total securities available for sale and transferred securities, Tax Expense (Benefit) | 27,183 | 239 | (6,089) | 17,098
Defined-benefit post-retirement benefit plans, Change in the net actuarial gain/loss, Tax Expense (Benefit) | 612 | 235 | 1,836 | 705
Derivatives, Reclassification adjustments for gains on interest rate swaps on variable-rate loans included in net income, Tax Expense (Benefit) | 0 | (3,270) | 0 | (9,812)
Total other comprehensive income (loss), Tax Expense (Benefit) | 27,795 | (2,796) | (4,253) | 7,991
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Net of Tax | 56,189 | 6,152 | 5,007 | 49,405
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Net of Tax | (5,740) | (5,685) | (16,201) | (17,627)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Net of Tax | 34 | (21) | (114) | (23)
Total securities available for sale and transferred securities, Net of Tax | 50,483 | 446 | (11,308) | 31,755
Defined-benefit post-retirement benefit plans,Change in the net actuarial gain/loss, Net of Tax | 1,136 | 437 | 3,410 | 1,310
Derivatives, Reclassification adjustments for gains on interest rate swaps on variabl-rate loans included in net income, Net of Tax | 0 | (6,075) | 0 | (18,223)
Other comprehensive income (loss), net of tax | $ 51,619 | $ (5,192) | $ (7,898) | $ 14,842

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