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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Tax Disclosure [Abstract] |  |  |
Income tax computed at federal statutory tax rate | $ 14,206 | $ 16,684 | $ 22,453
Tax-exempt interest, net | (2,268) | (2,511) | (3,226)
State income tax | 3 | 911 | 1,080
Dividends received deduction | (134) | (107) | (89)
Valuation allowance | (17) | (1,803) | 46
Prior year adjustments | 14 | 344 | 3
Other | 240 | 175 | 50
Income tax expense, Total | $ 12,044 | $ 13,693 | $ 20,317

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