Allowance for Loan Losses - Summary of Performing and Nonperforming Loans by Class (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable Recorded Investment [Line Items]
Loans	$ 445,924	$ 420,779
Real Estate - Commercial [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	154,734	150,543
Other Real Estate Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	42,713	28,275
Real Estate 1 - 4 Family Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	8,927	8,424
Real Estate - Residential [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	84,729	79,324
Home Equity [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	52,666	51,003
Other Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	5,393	5,496
Paycheck Protection Program [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	7,599	15,100
Commercial Loan [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	80,123	73,035
Consumer Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	9,040	9,579
Performing [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	445,063	419,807
Performing [Member] | Real Estate - Commercial [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	154,448	150,251
Performing [Member] | Other Real Estate Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	42,713	28,275
Performing [Member] | Real Estate 1 - 4 Family Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	8,927	8,424
Performing [Member] | Real Estate - Residential [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	84,566	78,987
Performing [Member] | Home Equity [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	52,635	50,970
Performing [Member] | Other Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	5,393	5,496
Performing [Member] | Paycheck Protection Program [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	7,599	15,100
Performing [Member] | Commercial Loan [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	79,742	72,725
Performing [Member] | Consumer Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	9,040	9,579
Non-Performing [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	861	972
Non-Performing [Member] | Real Estate - Commercial [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	286	292
Non-Performing [Member] | Real Estate - Residential [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	163	337
Non-Performing [Member] | Home Equity [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	31	33
Non-Performing [Member] | Commercial Loan [Member]
Financing Receivable Recorded Investment [Line Items]
Loans	$ 381	$ 310