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Income Taxes - Income Tax Expense from Operations from the Amount Computed by Applying the U.S. Federal Income Tax Statutory Rate of 21% to Income Before Income Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Disclosure [Abstract] |  |  |
Income tax computed at federal statutory tax rate | $ 16,249 | $ 14,206 | $ 16,684
Tax-exempt interest, net | (1,997) | (2,268) | (2,511)
State income tax | 779 | 3 | 911
Dividends received deduction | (125) | (134) | (107)
Valuation allowance | 46 | (17) | (1,803)
Prior year adjustments | 13 | 14 | 344
Other | 304 | 240 | 175
Income tax expense, Total | $ 15,269 | $ 12,044 | $ 13,693

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