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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Income Tax Disclosure [Abstract] |  |
Net unrealized loss on securities available for sale and transferred securities | $ 327,184 | $ 291,023
Allowance for credit losses | 67,697 | 62,592
Lease liabilities under operating leases | 64,691 | 66,442
Bonus accrual | 13,753 | 9,680
FDIC deposit insurance special assessment | 8,647 | 9,468
Stock-based compensation | 6,321 | 7,712
Net actuarial loss on defined benefit post-retirement benefit plans | 5,630 | 6,493
Deferred loan and lease origination fees | 3,990 | 4,129
Other | 6,496 | 5,892
Total gross deferred tax assets | 504,409 | 463,431
Right-of-use assets under operating leases | (56,759) | (58,905)
Premises and equipment | (38,352) | (42,640)
Intangible assets | (18,048) | (18,106)
Defined benefit post-retirement benefit plans | (13,591) | (13,073)
Other | (2,422) | (2,368)
Total gross deferred tax liabilities | (129,172) | (135,092)
Deferred Tax Assets, Net | $ 375,237 | $ 328,339

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