Investment Securities - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2022 USD ($) Securities	Dec. 31, 2021 USD ($) Securities
Marketable Securities [Line Items]
Number of securities less than 12 months | Securities	166
Unrealized losses securities less than 12 months	$ 5,235,000	$ 673,000
Percentage of amortized cost basis less than 12 months	9.14%
Number of securities more than 12 months | Securities	25
Unrealized losses securities more than 12 months	$ 6,370,000	$ 0
Percentage of amortized cost basis more than 12 months	19.90%
Other than temporary impairment charges	$ 0
Percentage of amortized cost basis		1.91%
Sales of available-for-sale securities	0	$ 0
Proceeds from maturities of securities available-for-sale	3,659,000	4,675,000
Gross realized gains	2,000	7,000
Securities pledged as collateral	$ 0	$ 0
Held to maturity securities debt maturities due after ten years	10 years
Mortgage-backed securities [Member]
Marketable Securities [Line Items]
Number of securities less than 12 months | Securities	59	18
Number of securities more than 12 months | Securities	14
Obligations of state and political subdivisions [Member]
Marketable Securities [Line Items]
Number of securities less than 12 months | Securities	107	7
Unrealized losses securities less than 12 months	$ 3,457,000	$ 9,000
Number of securities more than 12 months | Securities	7
Unrealized losses securities more than 12 months	$ 371,000	$ 0
U.S. government agency securities [Member]
Marketable Securities [Line Items]
Number of securities less than 12 months | Securities		0
Unrealized losses securities less than 12 months	$ 0	$ 29,000
Number of securities more than 12 months | Securities	4
Unrealized losses securities more than 12 months	$ 1,175,000	$ 0