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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Income Tax Disclosure [Abstract] |  |
Net unrealized loss on securities available for sale and transferred securities | $ 291,023 | $ 349,237
Lease liabilities under operating leases | 66,442 | 67,608
Allowance for credit losses | 62,592 | 60,137
Bonus accrual | 9,680 | 11,204
FDIC deposit insurance special assessment | 9,468 | 0
Stock-based compensation | 7,712 | 6,622
Net actuarial loss on defined benefit post-retirement benefit plans | 6,493 | 9,172
Deferred loan and lease origination fees | 4,129 | 3,675
Other | 5,892 | 6,109
Total gross deferred tax assets | 463,431 | 513,764
Right-of-use assets under operating leases | (58,905) | (60,651)
Premises and equipment | (42,640) | (45,647)
Intangible assets | (18,106) | (17,732)
Defined benefit post-retirement benefit plans | (13,073) | (12,730)
Other | (2,368) | (2,601)
Total gross deferred tax liabilities | (135,092) | (139,361)
Deferred Tax Assets, Net | $ 328,339 | $ 374,403

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