Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Summary Of Significant Accounting Policies [Line Items]
Interest bearing amounts held at other financial institutions	$ 61.0	$ 63.9	$ 61.0	$ 63.9
Dilutive effect of common stock issuable upon exercise of options	154,136	326,738	232,622	378,191
Anti-dilutive shares	266,768	0	215,902	0