Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2023 USD ($) Segment BankingCenter shares	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jan. 01, 2023 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of operating industry segment | Segment	1
Number of banking centers | BankingCenter	16
Cash reserve requirement		$ 0	$ 0
Available-for-sale, at fair value	$ 140,080,000	150,069,000
Allowance for credit/loan losses	$ 6,607,000	6,838,000	7,618,000
Amount of other real state owned		0	0
Impairment on goodwill		0	0
Advertising expenses		196,000	$ 178,000
Dilutive effects on earnings per share | shares	0
Retained earnings	$ 97,297,000	86,502,000
Allowance for credit losses, available for sale debt securities	0
Held to maturity security, allowance for credit loss	0	0
Prior Period Reclassification Adjustment Effect	$ 0
Accounting Standards Update 2016-13 [Member]
Summary Of Significant Accounting Policies [Line Items]
Allowance for credit/loan losses				$ 6,279,000
Change in accounting principle, Accounting standards update, Immaterial effect [true false]	true
Change in accounting principle, accounting standards update, adopted	true
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2023
Net of tax related to loans				442,000
Unfunded commitments				390,000
Accounting Standards Update 2016-13 [Member] | Cumulative Effect of Adoption [Memnber]
Summary Of Significant Accounting Policies [Line Items]
Retained earnings				$ 52,000
Accounting Standards Update 2022-06 [Member]
Summary Of Significant Accounting Policies [Line Items]
Change in accounting principle, Accounting standards update, Immaterial effect [true false]	true
Accounting Standards Update 2022-02 [Member]
Summary Of Significant Accounting Policies [Line Items]
Change in accounting principle, accounting standards update, adopted	true
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2023
U.S. Treasury Securities [Member]
Summary Of Significant Accounting Policies [Line Items]
Available-for-sale, at fair value	$ 17,689,000	22,225,000
Mortgage-Backed Securities [Member]
Summary Of Significant Accounting Policies [Line Items]
Available-for-sale, at fair value	$ 65,045,000	$ 68,890,000
Held-to-Maturity Securities [Member]
Summary Of Significant Accounting Policies [Line Items]
Total investment portfolio classified as held-to-maturity		61.00%
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Cash and cash equivalents, amounts due from banks and federal fund sold, maturity period	1 day
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Cash and cash equivalents, amounts due from banks and federal fund sold, maturity period	90 days
Maximum [Member] | Commercial Loan [Member]
Summary Of Significant Accounting Policies [Line Items]
Allowance for credit/loan losses	$ 500,000
Buildings [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of individual assets	20 years
Buildings [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of individual assets	40 years
Equipment [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of individual assets	3 years
Equipment [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of individual assets	10 years