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Other Comprehensive Income (Loss) - Component of Other Comprehensive Income (Loss) (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Equity [Abstract] |  |  |  |
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Before Tax Amount | $ 45,112 | $ (74,025) | $ 66,543 | $ (95,369)
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Before Tax Amount | (9,175) | (9,745) | (18,373) | (18,204)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Before Tax Amount | (2) | (6) | (2) | (11)
Total securities available for sale and transferred securities, Before Tax Amount | 35,935 | (83,776) | 48,168 | (113,584)
Defined-benefit post-retirement benefit plans, Change in the net actuarial gain/loss, Before Tax Amount | 671 | 1,639 | 1,343 | 3,279
Derivatives, Change in the accumulated gain/loss on effective cash flow hedge derivatives, Before Tax Amount | 0 | (33) | 0 | (33)
Derivatives, Reclassification adjustments for (gains) losses included in net income, Interest rate swaps on variable-rate loans, Before Tax Amount | (9,345) | (9,345) | (18,690) | (18,690)
Derivatives, Reclassification adjustments for (gains) losses included in net income, Interest rate swap on junior subordinated deferrable interest debentures, Before Tax Amount | 0 | 1,103 | 0 | 2,188
Total derivatives, Before Tax Amount | (9,345) | (8,275) | (18,690) | (16,535)
Total other comprehensive income (loss), before tax | 27,261 | (90,412) | 30,821 | (126,840)
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Tax Expense (Benefit) | 15,789 | (25,909) | 23,290 | (33,379)
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Tax Expense (Benefit) | (3,212) | (3,411) | (6,431) | (6,372)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Tax Expense (Benefit) | 0 | (2) | 0 | (4)
Total securities available for sale and transferred securities, Tax Expense (Benefit) | 12,577 | (29,322) | 16,859 | (39,755)
Defined-benefit post-retirement benefit plans, Change in the net actuarial gain/loss, Tax Expense (Benefit) | 235 | 574 | 470 | 1,148
Derivatives, Change in the accumulated gain/loss on effective cash flow hedge derivatives, Tax Expense (Benefit) | 0 | (12) | 0 | (12)
Derivatives, Reclassification adjustments for (gains) losses included in net income, Interest rate swaps on variable-rate loans, Tax Expense (Benefit) | (3,271) | (3,270) | (6,542) | (6,541)
Derivatives, Reclassification adjustments for (gains) losses included in net income, Interest rate swap on junior subordinated deferrable interest debentures, Tax Expense (Benefit) | 0 | 386 | 0 | 766
Total derivatives, Tax Expense (Benefit) | (3,271) | (2,896) | (6,542) | (5,787)
Total other comprehensive income (loss), Tax Expense (Benefit) | 9,541 | (31,644) | 10,787 | (44,394)
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Net of Tax | 29,323 | (48,116) | 43,253 | (61,990)
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Net of Tax | (5,963) | (6,334) | (11,942) | (11,832)
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Net of Tax | (2) | (4) | (2) | (7)
Total securities available for sale and transferred securities, Net of Tax | 23,358 | (54,454) | 31,309 | (73,829)
Defined-benefit post-retirement benefit plans,Change in the net actuarial gain/loss, Net of Tax | 436 | 1,065 | 873 | 2,131
Derivatives, Change in the accumulated gain/loss on effective cash flow hedge derivatives, Net of Tax | 0 | (21) | 0 | (21)
Derivatives, Reclassification adjustments for (gains) losses included in net income, Interest rate swaps on variable-rate loans, Net of Tax | (6,074) | (6,075) | (12,148) | (12,149)
Derivatives, Reclassification adjustments for (gains) losses included in net income, Interest rate swap on junior subordinated deferrable interest debentures, Net of Tax | 0 | 717 | 0 | 1,422
Total derivatives, Net of Tax | (6,074) | (5,379) | (12,148) | (10,748)
Other comprehensive income (loss), net of tax | $ 17,720 | $ (58,768) | $ 20,034 | $ (82,446)

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