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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Allowance for loan losses | $ 53,566 | $ 47,551
Alternative minimum tax carryforward | 30,384 | 10,934
Net actuarial loss on defined benefit post-retirement benefit plans | 21,956 | 25,172
Stock-based compensation | 18,140 | 21,246
Bonus accrual | 7,035 | 5,832
Gain on sale of assets | 2,485 | 2,044
Transaction costs | 1,587 | 1,716
Other | 4,449 | 5,718
Total gross deferred tax assets | 139,602 | 120,213
Premises and equipment | (33,777) | (23,038)
Defined benefit post-retirement benefit plans | (14,828) | (14,089)
Intangible assets | (11,697) | (8,940)
Net unrealized gain on securities available for sale and transferred securities | (8,699) | (86,484)
Leases | (3,042) | (4,491)
Section 481(a) change in accounting method (tangible property) | (1,694) | (3,387)
Prepaid expenses | (1,743) | (1,702)
Other | (436) | (563)
Total gross deferred tax liabilities | (75,916) | (142,694)
Deferred Tax Assets, Net | $ 63,686 |
Deferred Tax Liabilities, Net |  | $ (22,481)

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