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Income Taxes - Reconciliation of Tax Expense at the Federal Statutory Tax Rate (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Disclosure [Abstract] |  |  |
Tax expense at the federal statutory tax rate | $ 56,689 | $ 49,861 | $ 43,764
Increase (decrease) in tax expense from: |  |  |
Tax-exempt income, net | (343) | (337) | (436)
Modified endowment life contracts | (497) | (487) | (501)
Share based compensation excess tax benefit | (786) | (2,905) | (1,643)
Tax deductible dividends paid on ESOP | (505) | (481) | (490)
State tax expense, net of federal tax benefit | 4,945 | 3,788 | 4,779
Bargain purchase gain |  |  | (1,007)
Utilization of tax credits: |  |  |
New markets tax credits, net of amortization | (777) | (3,745) | (3,192)
Low-income housing tax credits, net of amortization | (1,106) | (1,024) | (1,533)
Other tax credits, net of amortization | (192) | (91) | (379)
Other, net | 55 | (247) | 1,406
Total income taxes | $ 57,483 | $ 44,332 | $ 40,768

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