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Allowance for Loans Losses - Summary of Impaired Financing Receivables (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivable, related allowance | $ 167 | $ 241
Impaired financing receivable, recorded investment | 1,449 | 1,408
Impaired financing receivable, unpaid principal balance | 1,449 | 1,408
Impaired financing receivable, average recorded investment | 1,408 | 1,547
Impaired financing receivable, interest income recognized | 36 | 14
Commercial and Industrial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivable, with an allowance recorded, recorded investment | 490 | 280
Impaired financing receivable, with an allowance recorded, unpaid principal balance | 490 | 280
Impaired financing receivable, related allowance | 70 | 143
Impaired financing receivable, with an allowance recorded, average recorded investment | 375 | 286
Impaired financing receivable, with an allowance recorded, interest income recognized | 1 | 2
Real Estate [Member] | Mortgage, Residential [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivable, with no specific allowance recorded, recorded investment | 624 | 395
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance | 624 | 395
Impaired financing receivable, with no specific allowance recorded, average recorded investment | 696 | 527
Impaired financing receivable, with no specific allowance recorded, interest income, accrual method | 28 | 7
Real Estate [Member] | Mortgage, Commercial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivable, with an allowance recorded, recorded investment | 335 | 733
Impaired financing receivable, with an allowance recorded, unpaid principal balance | 335 | 733
Impaired financing receivable, related allowance | 97 | 98
Impaired financing receivable, with an allowance recorded, average recorded investment | 337 | 734
Impaired financing receivable, with an allowance recorded, interest income recognized | $ 7 | $ 5

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