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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Allowance for loan losses | $ 32,626 | $ 53,566
Alternative minimum tax carryforward | 47,104 | 30,384
Net actuarial loss on defined benefit post-retirement benefit plans | 12,160 | 21,956
Stock-based compensation | 9,904 | 18,140
Bonus accrual | 1,136 | 7,035
Gain on sale of assets | 883 | 2,485
Transaction costs | 875 | 1,587
Other | 3,996 | 4,449
Total gross deferred tax assets | 108,684 | 139,602
Premises and equipment | (20,236) | (33,777)
Defined benefit post-retirement benefit plans | (9,012) | (14,828)
Intangible assets | (9,014) | (11,697)
Net unrealized gain on securities available for sale and transferred securities | (35,829) | (8,699)
Leases | (1,646) | (3,042)
Section 481(a) change in accounting method (tangible property) | 0 | (1,694)
Prepaid expenses | (996) | (1,743)
Other | (233) | (436)
Total gross deferred tax liabilities | (76,966) | (75,916)
Deferred Tax Assets, Net | $ 31,718 | $ 63,686

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