Securities - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Schedule of Available-for-sale Securities [Line Items]
Investments pledged, carrying value	$ 242,100,000		$ 221,900,000
Other securities	14,062,000		14,400,000
Gross realized gain (losses)	0	$ 0
Federal Home Loan Bank of Cincinnati and Indianapolis Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Other securities	14,100,000		14,400,000
Federal Reserve's Bank Term Funding Program [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments pledged, carrying value	$ 29,800,000		$ 29,900,000