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
	Mar. 31, 2023	Mar. 31, 2022
Investments Debt And Equity Securities [Abstract]
Net gains (losses) recognized on equity securities during the period	$ (68)	$ 50
Less: Net losses realized on the sale of equity securities during the period	0	0
Unrealized gains (losses) recognized on equity securities held at reporting date	$ (68)	$ 50