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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, 2019 | Dec. 31, 2018
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivable, recorded investment | $ 1,684 | $ 1,946
Impaired financing receivable, unpaid principal balance | 1,684 | 1,946
Impaired financing receivable, related allowance | 251 |
Impaired financing receivable, average recorded investment | 1,542 | 2,067
Impaired financing receivable, interest income recognized | 14 | 64
Mortgage, residential [Member] | Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivable, with no specific allowance recorded, recorded investment | 658 | 1,946
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance | 658 | 1,946
Impaired financing receivable, with no specific allowance recorded, average recorded investment | 661 | 2,067
Impaired financing receivable, with no specific allowance recorded, interest income, accrual method | 7 | $ 64
Commercial and industrial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivable, with an allowance recorded, recorded investment | 291 |
Impaired financing receivable, with an allowance recorded, unpaid principal balance | 291 |
Impaired financing receivable, with an allowance recorded, average recorded investment | 146 |
Impaired financing receivable, with an allowance recorded, interest income recognized | 2 |
Impaired financing receivable, related allowance | 151 |
Mortgage, commercial [Member] | Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivable, with an allowance recorded, recorded investment | 735 |
Impaired financing receivable, with an allowance recorded, unpaid principal balance | 735 |
Impaired financing receivable, with an allowance recorded, average recorded investment | 735 |
Impaired financing receivable, with an allowance recorded, interest income recognized | 5 |
Impaired financing receivable, related allowance | $ 100 |

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