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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Income Tax Disclosure [Abstract] |  |
Lease liabilities under operating leases | $ 65,815 | $ 67,839
Allowance for credit losses | 62,819 | 64,573
Net actuarial loss on defined benefit post-retirement benefit plans | 8,743 | 13,512
Stock-based compensation | 6,989 | 10,033
Bonus accrual | 7,506 | 3,961
Deferred loan and lease origination fees | 3,118 | 10,252
Other | 3,834 | 3,834
Total gross deferred tax assets | 158,824 | 174,004
Net unrealized gain on securities available for sale and transferred securities | (101,067) | (149,870)
Right-of-use assets under operating leases | (59,415) | (61,963)
Premises and equipment | (49,645) | (49,602)
Intangible assets | (16,595) | (14,596)
Defined benefit post-retirement benefit plans | (11,027) | (10,081)
Partnership interests | 0 | (2,913)
Leases | (712) | (1,090)
Other | (1,611) | (1,387)
Total gross deferred tax liabilities | (240,072) | (291,502)
Deferred Tax Liabilities, Net | $ (81,248) | $ (117,498)

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