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Loans and Allowance for Loan Losses - Summary of Impaired Financing Receivables (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Financing Receivable Impaired [Line Items] |  |  |  |  |
Impaired financing receivable, related allowance |  |  |  |  | $ 144
Impaired financing receivable, recorded investment | $ 8,233 |  | $ 8,233 |  | 2,331
Impaired financing receivable, unpaid principal balance | 8,332 |  | 8,332 |  | 2,835
Impaired financing receivable, with an allowance recorded, average recorded investment | 8,041 | $ 1,408 | 7,407 | $ 1,408 |
Impaired financing receivable, interest income recognized | 87 | 29 | 246 | 36 |
Real Estate [Member] | Mortgage, Commercial [Member] |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |
Impaired financing receivable, with no specific allowance recorded, recorded investment | 1,333 |  | 1,333 |  | 1,645
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance | 1,432 |  | 1,432 |  | 2,030
Impaired financing receivable, with no specific allowance recorded, average recorded investment | 1,378 |  | 1,402 |  |
Impaired financing receivable, with no specific allowance recorded, interest income, accrual method | 21 |  | 62 |  |
Impaired financing receivable, with an allowance recorded, average recorded investment |  | 337 |  | 337 |
Impaired financing receivable, with an allowance recorded, interest income recognized |  | 1 |  | 7 |
Real Estate [Member] | Construction, Commercial [Member] |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |
Impaired financing receivable, with no specific allowance recorded, recorded investment | 531 |  | 531 |  |
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance | 531 |  | 531 |  |
Impaired financing receivable, with no specific allowance recorded, average recorded investment | 532 |  | 537 |  |
Impaired financing receivable, with no specific allowance recorded, interest income, accrual method | 8 |  | 24 |  |
Real Estate [Member] | Mortgage, Residential [Member] |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |
Impaired financing receivable, with no specific allowance recorded, recorded investment | 1,672 |  | 1,672 |  | 452
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance | 1,672 |  | 1,672 |  | 571
Impaired financing receivable, with no specific allowance recorded, average recorded investment | 1,421 | 696 | 1,078 | 696 |
Impaired financing receivable, with no specific allowance recorded, interest income, accrual method | 5 | 28 | 11 | 28 |
Real Estate [Member] | Commercial and Industrial [Member] |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |
Impaired financing receivable, with no specific allowance recorded, recorded investment | 4,697 |  | 4,697 |  | 234
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance | 4,697 |  | 4,697 |  | 234
Impaired financing receivable, related allowance |  |  |  |  | $ 144
Impaired financing receivable, with no specific allowance recorded, average recorded investment | 4,710 |  | 4,390 |  |
Impaired financing receivable, with no specific allowance recorded, interest income, accrual method | $ 53 |  | $ 149 |  |
Impaired financing receivable, with an allowance recorded, average recorded investment |  | $ 375 |  | 375 |
Impaired financing receivable, with an allowance recorded, interest income recognized |  |  |  | $ 1 |

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