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Loans and Allowance for Loan Losses - Summary of Recorded Investment of PCI Loans, Past Due (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Current Loans | $ 81,503 | $ 826
Total Loans | 84,044 | 1,085
Commercial and Industrial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 8,947 |
Total Loans | 8,947 |
Construction, Commercial [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 13,929 | 35
Total Loans | 14,015 | 35
Mortgage, Commercial [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 52,199 | 584
Total Loans | 52,371 | 808
Mortgage, Residential [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 5,393 | 207
Total Loans | 7,671 | 242
Consumer [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 1,035 |
Total Loans | 1,040 |
30-89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 726 | 259
30-89 Days Past Due [Member] | Construction, Commercial [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 21 |
30-89 Days Past Due [Member] | Mortgage, Commercial [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 148 | 224
30-89 Days Past Due [Member] | Mortgage, Residential [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 552 | $ 35
30-89 Days Past Due [Member] | Consumer [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 5 |
Greater than 90 Days Past Due & Accruing [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 1,815 |
Greater than 90 Days Past Due & Accruing [Member] | Construction, Commercial [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 65 |
Greater than 90 Days Past Due & Accruing [Member] | Mortgage, Commercial [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 24 |
Greater than 90 Days Past Due & Accruing [Member] | Mortgage, Residential [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | $ 1,726 |

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