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Other Comprehensive Income (Loss) - Component of Other Comprehensive Income (Loss) (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Equity [Abstract] |  |
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Before Tax Amount | $ 21,431 | $ (21,344)
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Before Tax Amount | (9,198) | (8,459)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Before Tax Amount | 0 | (5)
Total securities available for sale and transferred securities, Before Tax Amount | 12,233 | (29,808)
Defined-benefit post-retirement benefit plans, Change in the net actuarial gain/loss, Before Tax Amount | 672 | 1,640
Derivatives, Change in the accumulated gain/loss on effective cash flow hedge derivatives, Before Tax Amount | 0 | 0
Derivatives, Reclassification adjustments for (gains) losses included in net income, Interest rate swaps on variable-rate loans, Before Tax Amount | (9,345) | (9,345)
Derivatives, Reclassification adjustments for (gains) losses included in net income, Interest rate swap on junior subordinated deferrable interest debentures, Before Tax Amount | 0 | 1,085
Total derivatives, Before Tax Amount | (9,345) | (8,260)
Total other comprehensive income (loss), before tax | 3,560 | (36,428)
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Tax Expense (Benefit) | 7,501 | (7,470)
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Tax Expense (Benefit) | (3,219) | (2,961)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Tax Expense (Benefit) | 0 | (2)
Total securities available for sale and transferred securities, Tax Expense (Benefit) | 4,282 | (10,433)
Defined-benefit post-retirement benefit plans, Change in the net actuarial gain/loss, Tax Expense (Benefit) | 235 | 574
Derivatives, Change in the accumulated gain/loss on effective cash flow hedge derivatives, Tax Expense (Benefit) | 0 | 0
Derivatives, Reclassification adjustments for (gains) losses included in net income, Interest rate swaps on variable-rate loans, Tax Expense (Benefit) | (3,271) | (3,271)
Derivatives, Reclassification adjustments for (gains) losses included in net income, Interest rate swap on junior subordinated deferrable interest debentures, Tax Expense (Benefit) | 0 | 380
Total derivatives, Tax Expense (Benefit) | (3,271) | (2,891)
Total other comprehensive income (loss), Tax Expense (Benefit) | 1,246 | (12,750)
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Net of Tax | 13,930 | (13,874)
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Net of Tax | (5,979) | (5,498)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Net of Tax | 0 | (3)
Total securities available for sale and transferred securities, Net of Tax | 7,951 | (19,375)
Defined-benefit post-retirement benefit plans,Change in the net actuarial gain/loss, Net of Tax | 437 | 1,066
Derivatives, Change in the accumulated gain/loss on effective cash flow hedge derivatives, Net of Tax | 0 | 0
Derivatives, Reclassification adjustments for (gains) losses included in net income, Interest rate swaps on variable-rate loans, Net of Tax | (6,074) | (6,074)
Derivatives, Reclassification adjustments for (gains) losses included in net income, Interest rate swap on junior subordinated deferrable interest debentures, Net of Tax | 0 | 705
Total derivatives, Net of Tax | (6,074) | (5,369)
Other comprehensive income (loss), net of tax | $ 2,314 | $ (23,678)

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