Loans - Summary of Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 680,980		$ 626,958
Allowance for credit/loan losses	(6,691)	$ (6,559)	(6,838)	$ (7,008)	$ (7,268)	$ (7,618)
Deferred loan (fees) costs, net	(31)		213
Net Total Loans	674,258		620,333
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	143,227		129,343
Allowance for credit/loan losses	(1,963)	(2,119)	(1,110)	(1,249)	(1,213)	(1,240)
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	188,910		231,785
Allowance for credit/loan losses	(2,129)	(1,882)	(2,760)	(2,112)	(2,422)	(2,838)
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans			194,125
Allowance for credit/loan losses				(1,289)	(1,177)	(992)
Commercial Lessors of Buildings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	78,520
Allowance for credit/loan losses	(1,226)	(1,237)
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	44,446
Allowance for credit/loan losses	(255)	(283)	(803)
Consumer Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	167,419
Allowance for credit/loan losses	(775)	(714)	(1,268)
Home Equity Line of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	41,093
Allowance for credit/loan losses	(187)	(178)
Consumer Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	11,197
Allowance for credit/loan losses	(57)	(52)	(233)
Consumer Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	6,168
Allowance for credit/loan losses	$ (99)	$ (94)
Construction & Land Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans			55,318
Allowance for credit/loan losses				(1,276)	(1,607)	(1,380)
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans			$ 16,387
Allowance for credit/loan losses				$ (268)	$ (395)	$ (421)