Loans - Schedule of Analysis of Past due Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	$ 396,941	$ 359,876
Loans, gross	397,714	361,947
Commercial Real Estate [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	231,471	209,126
Loans, gross	231,893	210,858
Commercial Land Development [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	0	0
Loans, gross	0	0
Commercial Other [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	47,898	43,708
Loans, gross	47,898	43,708
Residential Real Estate First Mortgages [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	97,396	85,200
Loans, gross	97,747	85,444
Residential Real Estate Construction [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	359	3,248
Loans, gross	359	3,248
Consumer Home Equity and Lines of Credit [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	19,683	18,497
Loans, gross	19,683	18,590
Consumer Other [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	134	97
Loans, gross	134	99
Loans Past Due 30-89 Days [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	378	1,987
Loans Past Due 30-89 Days [Member] | Commercial Real Estate [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	79	1,732
Loans Past Due 30-89 Days [Member] | Commercial Land Development [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	0	0
Loans Past Due 30-89 Days [Member] | Commercial Other [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	0	0
Loans Past Due 30-89 Days [Member] | Residential Real Estate First Mortgages [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	299	181
Loans Past Due 30-89 Days [Member] | Residential Real Estate Construction [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	0	0
Loans Past Due 30-89 Days [Member] | Consumer Home Equity and Lines of Credit [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	0	72
Loans Past Due 30-89 Days [Member] | Consumer Other [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	0	2
Loans Past Due 90+ Days [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	395	84
Loans Past Due 90+ Days [Member] | Commercial Real Estate [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	343	0
Loans Past Due 90+ Days [Member] | Commercial Land Development [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	0	0
Loans Past Due 90+ Days [Member] | Commercial Other [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	0	0
Loans Past Due 90+ Days [Member] | Residential Real Estate First Mortgages [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	52	63
Loans Past Due 90+ Days [Member] | Residential Real Estate Construction [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	0	0
Loans Past Due 90+ Days [Member] | Consumer Home Equity and Lines of Credit [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	0	21
Loans Past Due 90+ Days [Member] | Consumer Other [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	0	0
Total Past Due [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	773	2,071
Total Past Due [Member] | Commercial Real Estate [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	422	1,732
Total Past Due [Member] | Commercial Land Development [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	0	0
Total Past Due [Member] | Commercial Other [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	0	0
Total Past Due [Member] | Residential Real Estate First Mortgages [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	351	244
Total Past Due [Member] | Residential Real Estate Construction [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	0	0
Total Past Due [Member] | Consumer Home Equity and Lines of Credit [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	0	93
Total Past Due [Member] | Consumer Other [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	$ 0	$ 2