Loans - Schedule of Aging of Past Due and Nonaccrual Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	$ 1,060	$ 1,083
Total past due and non-accrual	1,377	1,472
Total ending loans balance	567,123	549,050
Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans	565,746	547,578
30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans	162	367
60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans	34	17
90 Days Plus Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans	121	5
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	205	208
Total past due and non-accrual	206	235
Total ending loans balance	127,217	123,933
Commercial [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans	127,011	123,698
Commercial [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans		5
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	1	5
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	138	139
Total past due and non-accrual	138	139
Total ending loans balance	189,417	194,754
Commercial Real Estate [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans	189,279	194,615
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	356	367
Total past due and non-accrual	546	558
Total ending loans balance	172,987	168,247
Residential Real Estate [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans	172,441	167,689
Residential Real Estate [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans	70	191
Residential Real Estate [Member] | 90 Days Plus Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans	120
Construction & Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	329	329
Total past due and non-accrual	329	329
Total ending loans balance	62,184	46,042
Construction & Land Development [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans	61,855	45,713
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	32	40
Total past due and non-accrual	158	211
Total ending loans balance	15,318	16,074
Consumer [Member] | Current
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans	15,160	15,863
Consumer [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans	92	$ 171
Consumer [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Loans	$ 34