Short-Term Borrowings - Summary of Federal Funds Purchased and Other Short-term Borrowings (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Federal Funds Purchased [Member]
Short-term Debt [Line Items]
Maximum indebtedness during the year		$ 50,000,000
Average balance during the year		$ 137,000
Average rate paid during the year		4.38%
Short Term Borrowings, FHLB advances [Member]
Short-term Debt [Line Items]
Outstanding balance at year end	$ 338,000,000	$ 393,700,000
Maximum indebtedness during the year	521,500,000	435,500,000
Average balance during the year	$ 280,887,000	$ 66,875,000
Average rate paid during the year	5.12%	3.84%
Interest rate on year end balance	5.41%	4.24%