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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, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Income tax computed at federal statutory tax rate	$ 14,502	$ 16,249	$ 14,206
Tax-exempt interest, net	(1,945)	(1,997)	(2,268)
State income tax	679	779	3
Dividends received deduction	(85)	(125)	(134)
IRC section 162(m) compensation adjustment	158	46	(17)
Prior year adjustments	10	13	14
Other	301	304	240
Income tax expense, Total	$ 13,620	$ 15,269	$ 12,044

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