Short-Term Borrowings - Summary of Federal Funds Purchased and Other Short-term Borrowings (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
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	5.27%
Short Term, FHLB advances [Member]
Short-term Debt [Line Items]
Outstanding balance at year end	$ 339,000,000	$ 338,000,000
Maximum indebtedness during the year	501,500,000	521,500,000
Average balance during the year	$ 341,692,000	$ 280,887,000
Average rate paid during the year	5.23%	5.12%
Interest rate on year end balance	4.42%	5.41%