Short-Term Borrowings - Summary of Federal Funds Purchased and Other Short-term Borrowings (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Federal Funds Purchased [Member]
Short-term Debt [Line Items]
Maximum indebtedness during the year	$ 50,000,000	$ 50,000,000	$ 50,000,000
Average balance during the year	$ 137,000	$ 137,000	$ 228,000
Average rate paid during the year	4.38%	0.73%	0.35%
Short Term Borrowings, FHLB advances [Member]
Short-term Debt [Line Items]
Outstanding balance at year end	$ 393,700,000
Maximum indebtedness during the year	435,500,000		$ 102,700,000
Average balance during the year	$ 66,875,000		$ 8,151,000
Average rate paid during the year	3.84%		1.64%
Interest rate on year end balance	4.24%