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Other Comprehensive Income (Loss) - Component of Other Comprehensive Income (Loss) (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Equity [Abstract] |  |  |  |
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Before Tax Amount | $ (551) | $ 40,122 | $ (95,920) | $ 62,972
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Before Tax Amount | (8,054) | 0 | (26,258) | 0
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Before Tax Amount | 14 | 0 | 3 | 121
Total securities available for sale and transferred securities, Before Tax Amount | (8,591) | 40,122 | (122,175) | 63,093
Defined-benefit post-retirement benefit plans, Change in the net actuarial gain/loss, Before Tax Amount | 1,640 | 1,427 | 4,919 | 4,084
Derivatives, Change in the accumulated gain/loss on effective cash flow hedge derivatives, Before Tax Amount | (15) | (269) | (48) | (760)
Derivatives, Reclassification adjustments for (gains) losses included in net income, Interest rate swaps on variable-rate loans, Before Tax Amount | (9,345) | (9,345) | (28,035) | (28,035)
Derivatives, Reclassification adjustments for (gains) losses included in net income, Interest rate swap on junior subordinated deferrable interest debentures, Before Tax Amount | 1,120 | 1,063 | 3,308 | 3,140
Total derivatives, Before Tax Amount | (8,240) | (8,551) | (24,775) | (25,655)
Total other comprehensive income, Before Tax Amount | (15,191) | 32,998 | (142,031) | 41,522
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Tax Expense (Benefit) | (193) | 14,043 | (33,572) | 22,041
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Tax Expense (Benefit) | (2,818) | 0 | (9,190) | 0
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Tax Expense (Benefit) | 5 | 0 | 1 | 42
Total securities available for sale and transferred securities, Tax Expense (Benefit) | (3,006) | 14,043 | (42,761) | 22,083
Defined-benefit post-retirement benefit plans, Change in the net actuarial gain/loss, Tax Expense (Benefit) | 574 | 499 | 1,722 | 1,429
Derivatives, Change in the accumulated gain/loss on effective cash flow hedge derivatives, Tax Expense (Benefit) | (5) | (93) | (17) | (266)
Derivatives, Reclassification adjustments for (gains) losses included in net income, Interest rate swaps on variable-rate loans, Tax Expense (Benefit) | (3,271) | (3,271) | (9,812) | (9,812)
Derivatives, Reclassification adjustments for (gains) losses included in net income, Interest rate swap on junior subordinated deferrable interest debentures, Tax Expense (Benefit) | 392 | 372 | 1,158 | 1,099
Total derivatives, Tax Expense (Benefit) | (2,884) | (2,992) | (8,671) | (8,979)
Total other comprehensive income, Tax Expense (Benefit) | (5,316) | 11,550 | (49,710) | 14,533
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Net of Tax | (358) | 26,079 | (62,348) | 40,931
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Net of Tax | (5,236) | 0 | (17,068) | 0
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Net of Tax | 9 | 0 | 2 | 79
Total securities available for sale and transferred securities, Net of Tax | (5,585) | 26,079 | (79,414) | 41,010
Defined-benefit post-retirement benefit plans,Change in the net actuarial gain/loss, Net of Tax | 1,066 | 928 | 3,197 | 2,655
Derivatives, Change in the accumulated gain/loss on effective cash flow hedge derivatives, Net of Tax | (10) | (176) | (31) | (494)
Derivatives, Reclassification adjustments for (gains) losses included in net income, Interest rate swaps on variable-rate loans, Net of Tax | (6,074) | (6,074) | (18,223) | (18,223)
Derivatives, Reclassification adjustments for (gains) losses included in net income, Interest rate swap on junior subordinated deferrable interest debentures, Net of Tax | 728 | 691 | 2,150 | 2,041
Total derivatives, Net of Tax | (5,356) | (5,559) | (16,104) | (16,676)
Other comprehensive income (loss), net of tax | $ (9,875) | $ 21,448 | $ (92,321) | $ 26,989

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