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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
	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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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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