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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, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Accumulated Other Comprehensive Earnings [Abstract] |  |  |  |
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Before Tax Amount | $ (74,025) | $ 20,968 | $ (95,369) | $ 22,850
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Before Tax Amount | (9,745) |  | (18,204) |
Securities available for sale and transferred securities, Reclassification adjustment for (gains) losses included in net income, Before Tax Amount | (6) | (370) | (11) | 121
Total securities available for sale and transferred securities, Before Tax Amount | (83,776) | 20,598 | (113,584) | 22,971
Defined-benefit post-retirement benefit plans, Change in the net actuarial gain/loss, Before Tax Amount | 1,639 | 1,428 | 3,279 | 2,657
Derivatives, Change in the accumulated gain/loss on effective cash flow hedge derivatives, Before Tax Amount | (33) | (64) | (33) | (491)
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 | 1,103 | 1,044 | 2,188 | 2,077
Total derivatives, Before Tax Amount | (8,275) | (8,365) | (16,535) | (17,104)
Total other comprehensive income, Before Tax Amount | (90,412) | 13,661 | (126,840) | 8,524
Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Tax Expense (Benefit) | (25,909) | 7,340 | (33,379) | 7,998
Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Tax Expense (Benefit) | (3,411) |  | (6,372) |
Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Tax Expense (Benefit) | (2) | (130) | (4) | 42
Total securities available for sale and transferred securities, Tax Expense (Benefit) | (29,322) | 7,210 | (39,755) | 8,040
Defined-benefit post-retirement benefit plans, Change in the net actuarial gain/loss, Tax Expense (Benefit) | 574 | 500 | 1,148 | 930
Derivatives, Change in the accumulated gain/loss on effective cash flow hedge derivatives, Tax Expense (Benefit) | (12) | (23) | (12) | (173)
Derivatives, Reclassification adjustments for (gains) losses included in net income, Interest rate swaps on variable-rate loans, Tax Expense (Benefit) | (3,270) | (3,270) | (6,541) | (6,541)
Derivatives, Reclassification adjustments for (gains) losses included in net income, Interest rate swap on junior subordinated deferrable interest debentures, Tax Expense (Benefit) | 386 | 365 | 766 | 727
Total derivatives, Tax Expense (Benefit) | (2,896) | (2,928) | (5,787) | (5,987)
Total other comprehensive income, Tax Expense (Benefit) | (31,644) | 4,782 | (44,394) | 2,983
Change in net unrealized gain/loss during the period, Net of Tax | (48,116) | 13,628 | (61,990) | 14,852
Change in net unrealized gain on securities transferred to held to maturity, Net of Tax | (6,334) |  | (11,832) |
Reclassification adjustment for net (gains) losses included in net income, Net of Tax | (4) | (240) | (7) | 79
Total securities available for sale and transferred securities, Net of Tax | (54,454) | 13,388 | (73,829) | 14,931
Change in the net actuarial gain/loss, Net of Tax | 1,065 | 928 | 2,131 | 1,727
Change in the accumulated gain/loss on effective cash flow hedge derivatives, Net of Tax | (21) | (41) | (21) | (318)
Interest rate swaps on variable-rate loans, Net of Tax | (6,075) | (6,075) | (12,149) | (12,149)
Interest rate swap on junior subordinated deferrable interest debentures, Net of Tax | 717 | 679 | 1,422 | 1,350
Total derivatives, Net of Tax | (5,379) | (5,437) | (10,748) | (11,117)
Other comprehensive income (loss), net of tax | $ (58,768) | $ 8,879 | $ (82,446) | $ 5,541

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