Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Summary Of Significant Accounting Policies [Line Items]
Interest bearing amounts held at other financial institutions	$ 126.1	$ 38.0	$ 126.1	$ 38.0
Dilutive effect of common stock issuable upon exercise of options	348,675	423,469	372,565	420,471
Anti-dilutive shares		0	0	0
Restricted Stock and Restricted Stock Units [Member]
Summary Of Significant Accounting Policies [Line Items]
Anti-dilutive shares	48,416