Securities - Schedule of Net Gains and Losses on Equity Investments Recognized in Earnings and Portion of Unrealized Gains and Losses for Period that Relates to Equity Investments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract]
Net gains (losses) recognized on equity securities during the period	$ 69	$ (133)	$ (169)	$ (44)
Less: Net losses realized on the sale of equity securities during the period	0	0	0	0
Unrealized gains (losses) recognized on equity securities held at reporting date	$ 69	$ (133)	$ (169)	$ (44)