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Loans and Allowance for Loan Losses - Summary of Loan Portfolio Individually and Collectively Evaluated for Impairment (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Loans and Leases Receivable Disclosure [Line Items] |  |
Gross loans, excluding PPP loans | $ 703,230 | $ 647,572
Less: Unearned income and deferred costs | (4,271) | (738)
Total, excluding PPP loans | 698,959 | 646,834
Commercial and Industrial [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Gross loans, excluding PPP loans | 93,286 | 77,728
Construction, Commercial [Member] | Real Estate [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Gross loans, excluding PPP loans | 54,702 | 38,039
Construction, Residential [Member] | Real Estate [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Gross loans, excluding PPP loans | 18,040 | 26,778
Mortgage, Commercial [Member] | Real Estate [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Gross loans, excluding PPP loans | 273,499 | 251,824
Mortgage, Residential [Member] | Real Estate [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Gross loans, excluding PPP loans | 213,404 | 208,494
Mortgage, Farmland [Member] | Real Estate [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Gross loans, excluding PPP loans | 3,615 | 5,507
Consumer Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Gross loans, excluding PPP loans | 46,684 | 39,202
Individually Evaluated for Impairment [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Gross loans, excluding PPP loans | 2,331 | 1,408
Total, excluding PPP loans | 2,331 | 1,408
Individually Evaluated for Impairment [Member] | Commercial and Industrial [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Gross loans, excluding PPP loans | 234 | 280
Individually Evaluated for Impairment [Member] | Mortgage, Commercial [Member] | Real Estate [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Gross loans, excluding PPP loans | 1,645 | 733
Individually Evaluated for Impairment [Member] | Mortgage, Residential [Member] | Real Estate [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Gross loans, excluding PPP loans | 452 | 395
Collectively Evaluated for Impairment [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Gross loans, excluding PPP loans | 700,899 | 646,164
Less: Unearned income and deferred costs | (4,271) | (738)
Total, excluding PPP loans | 696,628 | 645,426
Collectively Evaluated for Impairment [Member] | Commercial and Industrial [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Gross loans, excluding PPP loans | 93,052 | 77,448
Collectively Evaluated for Impairment [Member] | Construction, Commercial [Member] | Real Estate [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Gross loans, excluding PPP loans | 54,702 | 38,039
Collectively Evaluated for Impairment [Member] | Construction, Residential [Member] | Real Estate [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Gross loans, excluding PPP loans | 18,040 | 26,778
Collectively Evaluated for Impairment [Member] | Mortgage, Commercial [Member] | Real Estate [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Gross loans, excluding PPP loans | 271,854 | 251,091
Collectively Evaluated for Impairment [Member] | Mortgage, Residential [Member] | Real Estate [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Gross loans, excluding PPP loans | 212,952 | 208,099
Collectively Evaluated for Impairment [Member] | Mortgage, Farmland [Member] | Real Estate [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Gross loans, excluding PPP loans | 3,615 | 5,507
Collectively Evaluated for Impairment [Member] | Consumer Loans [Member] |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Gross loans, excluding PPP loans | $ 46,684 | $ 39,202

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