Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Accounting Policies [Abstract]
Interest bearing amounts held at other financial institutions	$ 63.9	$ 77.4	$ 63.9	$ 77.4
Dilutive effect of common stock issuable upon exercise of options	326,738	403,367	378,191	407,795
Anti-dilutive shares	0	0	0	0