Securities - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Investments pledged, carrying value	$ 77,100	$ 83,200
Other securities	4,905	5,939
Federal Home Loan Bank of Cincinnati and Indianapolis Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Other securities	4,500	5,800
Ohio Equity Fund for Housing Limited Partnership [Member]
Schedule of Available-for-sale Securities [Line Items]
Other securities	$ 357	$ 151
Minimum [Member]
Schedule of Available-for-sale Securities [Line Items]
Underwater security	10 years
Loss position existed	3 years