Federal Funds Purchased and Securities Sold Under Agreement to Repurchase - Additional Information (Detail) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Variable Interest Entity [Line Items]
Federal funds purchased	$ 0	$ 22,600,000
Securities sold under agreements to repurchase	28,200,000
Pledged as Collateral
Variable Interest Entity [Line Items]
Securities sold under agreements to repurchase	$ 42,600,000	$ 43,600,000