Loans - Schedule of Analysis of Past due Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	$ 96	$ 375
Total Loans	351,888	325,992
Commercial Real Estate [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Total Loans	205,402	185,223
Commercial Land Development [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Total Loans	0	1,400
Commercial Other [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans		33
Total Loans	42,858	38,160
Residential Real Estate First Mortgages [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	69	342
Total Loans	83,165	80,661
Residential Real Estate Construction [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Total Loans	3,726	3,388
Consumer Home Equity and Lines of Credit [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	27
Total Loans	16,592	17,032
Consumer Other [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Total Loans	145	128
Loans Past Due 30-89 Days [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	96	375
Loans Past Due 30-89 Days [Member] | Commercial Other [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans		33
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	69	342
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	27
Financial Asset, Not Past Due [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	351,792	325,617
Financial Asset, Not Past Due [Member] | Commercial Real Estate [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	205,402	185,223
Financial Asset, Not Past Due [Member] | Commercial Land Development [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	0	1,400
Financial Asset, Not Past Due [Member] | Commercial Other [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	42,858	38,127
Financial Asset, Not Past Due [Member] | Residential Real Estate First Mortgages [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	83,096	80,319
Financial Asset, Not Past Due [Member] | Residential Real Estate Construction [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	3,726	3,388
Financial Asset, Not 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	16,565	17,032
Financial Asset, Not Past Due [Member] | Consumer Other [Member]
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Past Due / Current Loans	$ 145	$ 128