Loans - Schedule of Aging of Accruing Past Due and Nonaccrual Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	$ 1,083	$ 4,448
Total Past Due and Nonaccrual	1,472	5,355
Total ending loans balance	549,050	609,870
Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans	547,578	604,515
30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans	367	836
60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans	17	22
90 Days Plus Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans	5	49
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	208	1,225
Total Past Due and Nonaccrual	235	1,276
Total ending loans balance	123,933	191,540
Commercial [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans	123,698	190,264
Commercial [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans	5	51
Commercial [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans	17
Commercial [Member] | 90 Days Plus Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans	5
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	139	2,205
Total Past Due and Nonaccrual	139	2,216
Total ending loans balance	194,754	187,221
Commercial Real Estate [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans	194,615	185,005
Commercial Real Estate [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans		11
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	367	688
Total Past Due and Nonaccrual	558	1,343
Total ending loans balance	168,247	177,155
Residential Real Estate [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans	167,689	175,812
Residential Real Estate [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans	191	606
Residential Real Estate [Member] | 90 Days Plus Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans		49
Construction & Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	329	317
Total Past Due and Nonaccrual	329	317
Total ending loans balance	46,042	36,038
Construction & Land Development [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans	45,713	35,721
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	40	13
Total Past Due and Nonaccrual	211	203
Total ending loans balance	16,074	17,916
Consumer [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans	15,863	17,713
Consumer [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans	$ 171	168
Consumer [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans		$ 22