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Loans and Allowance for Loan Losses - Summary of Impaired Financing Receivables (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Financing Receivable Impaired [Line Items] |  |  |  |  |
Impaired financing receivable, related allowance | $ 444 |  | $ 444 |  | $ 144
Impaired financing receivable, recorded investment | 7,616 |  | 7,616 |  | 2,331
Impaired financing receivable, unpaid principal balance | 7,616 |  | 7,616 |  | 2,835
Impaired financing receivable, with an allowance recorded, average recorded investment | 7,230 | $ 1,222 | 7,375 | $ 1,222 |
Impaired financing receivable, interest income recognized | 84 |  | 169 | 3 |
Real Estate [Member] | Mortgage, Commercial [Member] |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |
Impaired financing receivable, with no specific allowance recorded, recorded investment | 182 |  | 182 |  | 1,645
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance | 182 |  | 182 |  | 2,030
Impaired financing receivable, related allowance | 387 |  | 387 |  |
Impaired financing receivable, with an allowance recorded, recorded investment | 1,188 |  | 1,188 |  |
Impaired financing receivable, with an allowance recorded, unpaid principal balance | 1,188 |  | 1,188 |  |
Impaired financing receivable, with no specific allowance recorded, average recorded investment | 185 |  | 210 |  |
Impaired financing receivable, with no specific allowance recorded, interest income, accrual method | 3 |  | 7 |  |
Impaired financing receivable, with an allowance recorded, average recorded investment | 1,207 |  | 1,211 |  |
Impaired financing receivable, with an allowance recorded, interest income recognized | 17 |  | 34 |  |
Real Estate [Member] | Construction, Commercial [Member] |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |
Impaired financing receivable, with no specific allowance recorded, recorded investment | 535 |  | 535 |  |
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance | 535 |  | 535 |  |
Impaired financing receivable, with no specific allowance recorded, average recorded investment | 537 |  | 539 |  |
Impaired financing receivable, with no specific allowance recorded, interest income, accrual method | 8 |  | 16 |  |
Real Estate [Member] | Mortgage, Residential [Member] |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |
Impaired financing receivable, with no specific allowance recorded, recorded investment | 919 |  | 919 |  | 452
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance | 919 |  | 919 |  | 571
Impaired financing receivable, related allowance | 57 |  | 57 |  |
Impaired financing receivable, with an allowance recorded, recorded investment | 57 |  | 57 |  |
Impaired financing receivable, with an allowance recorded, unpaid principal balance | 57 |  | 57 |  |
Impaired financing receivable, with no specific allowance recorded, average recorded investment | 920 | 581 | 890 | 581 |
Impaired financing receivable, with no specific allowance recorded, interest income, accrual method | 7 |  | 13 |  |
Impaired financing receivable, with an allowance recorded, average recorded investment | 57 | 376 | 116 | 376 |
Impaired financing receivable, with an allowance recorded, interest income recognized |  |  |  | 2 |
Real Estate [Member] | Commercial and Industrial [Member] |  |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |  |
Impaired financing receivable, with no specific allowance recorded, recorded investment | 4,735 |  | 4,735 |  | 234
Impaired financing receivable, with no specific allowance recorded, unpaid principal balance | 4,735 |  | 4,735 |  | 234
Impaired financing receivable, related allowance |  |  |  |  | $ 144
Impaired financing receivable, with no specific allowance recorded, average recorded investment | 4,324 |  | 4,409 |  |
Impaired financing receivable, with no specific allowance recorded, interest income, accrual method | $ 49 |  | $ 99 |  |
Impaired financing receivable, with an allowance recorded, average recorded investment |  | $ 265 |  | 265 |
Impaired financing receivable, with an allowance recorded, interest income recognized |  |  |  | $ 1 |

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