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Loans and Allowance for Loan Losses - Summary of Impaired Financing Receivables (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Financing Receivable Impaired [Line Items] |  |
Impaired financing receivable, related allowance |  | $ 144
Impaired financing receivable, recorded investment | $ 5,692 | 2,331
Impaired financing receivable, unpaid principal balance | 5,752 | 2,835
Impaired financing receivable, with an allowance recorded, average recorded investment | 5,217 | 2,991
Impaired financing receivable, interest income recognized | 63 | 6
Real Estate [Member] | Construction, Commercial [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Impaired financing receivable, with no specific allowance recorded, recorded investment | 540 |
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance | 539 |
Impaired financing receivable, with no specific allowance recorded, average recorded investment | 542 |
Impaired financing receivable, with no specific allowance recorded, interest income, accrual method | 8 |
Real Estate [Member] | Mortgage, Commercial [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Impaired financing receivable, with no specific allowance recorded, recorded investment | 1,391 | 1,645
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance | 1,460 | 2,030
Impaired financing receivable, with no specific allowance recorded, average recorded investment | 1,384 | 2,091
Impaired financing receivable, with no specific allowance recorded, interest income, accrual method | 14 | 4
Real Estate [Member] | Mortgage, Residential [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Impaired financing receivable, with no specific allowance recorded, recorded investment | 592 | 452
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance | 591 | 571
Impaired financing receivable, with no specific allowance recorded, average recorded investment | 583 | 538
Impaired financing receivable, with no specific allowance recorded, interest income, accrual method | 6 | 2
Real Estate [Member] | Commercial and Industrial [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Impaired financing receivable, with no specific allowance recorded, recorded investment | 3,169 |
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance | 3,162 |
Impaired financing receivable, with no specific allowance recorded, average recorded investment | 3,250 |
Impaired financing receivable, with no specific allowance recorded, interest income, accrual method | $ 35 |
Impaired financing receivable, with an allowance recorded, recorded investment |  | 234
Impaired financing receivable, with an allowance recorded, unpaid principal balance |  | 234
Impaired financing receivable, related allowance |  | 144
Impaired financing receivable, with an allowance recorded, average recorded investment |  | $ 362

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