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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