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Loans and Allowance for Loan Losses - Additional Information (Detail) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2020 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) Loan | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Gross loans |  |  | $ 995,298,000 | $ 647,572,000 |
Loans acquired |  |  | 12,605,000 | 19,687,000 |
Bad debts recovered |  |  | 310,000 | 211,000 |
Specific impairment |  |  | 2,331,000 | 1,408,000 |
Allowance for loan losses |  |  | 13,827,000 | 4,572,000 | $ 3,580,000
Nonperforming trouble debt restructuring |  |  | 142,000 | 144,000 |
Doubtful [Member] |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Gross loans |  |  | 0 | 0 |
Loss [Member] |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Gross loans |  |  | 0 | 0 |
Specifically impaired loans [Member] |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Bad debts recovered |  | $ 200,000 |  |  | $ 200,000
Specifically impaired loans [Member] | PCI loans [Member] |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Outstanding specifically impaired loans |  |  | 2,100,000 |  |
Specific impairment |  |  | 190,000 |  |
FHLB [Member] |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Loans held for investment pledged |  |  | 213,300,000 | $ 146,100,000 |
Payment Deferral [Member] |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Gross loans |  |  | $ 110,600,000 |  |
Number of loan deferrals | Loan |  |  | 550 |  |
Number of loan deferrals delay in payment | Loan |  |  | 8 |  |
Loan deferral amount delay in payment |  |  | $ 6,300,000 |  |
Paycheck Protection Program [Member] |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Payrolls and other operating expenses | $ 650,000,000,000 |  |  |  |
Loans and lease receivable prior period | 2 years |  |  |  |
Loans and lease receivable subsequent period | 5 years |  |  |  |
Percentage of Loans receivable interest rate | 1.00% |  |  |  |
Percentage of loan earned processing fee one rate | 1.00% |  |  |  |
Percentage of loan earned processing fee two rate | 3.00% |  |  |  |
Percentage of loan earned processing fee three rate | 5.00% |  |  |  |
Loans and leases receivable originated |  |  | 363,400,000 |  |
Loans and leases receivable forgiven |  |  | 71,300,000 |  |
Gross loans |  |  | 292,068,000 |  |
Loans and leases receivable of processing fees, net of agent fees |  |  | 11,500,000 |  |
Loans and leases receivable of interest income |  |  | $ 2,400,000 |  |
Number of loans | Loan |  |  | 2,400 |  |
Loans and leases receivable recognized interest income |  |  | $ 7,900,000 |  |
Allowance for loan losses |  |  | $ 0 |  |

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