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Loans and Allowance for Loan Losses - Summary of Recorded Investment of PCI Loans, Past Due (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Current Loans | $ 95,215 | $ 826
Total Loans | 97,892 | 1,085
Commercial and Industrial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 10,026 |
Total Loans | 10,213 |
Construction, Commercial [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 31,032 | 35
Total Loans | 31,050 | 35
Mortgage, Commercial [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 46,768 | 584
Total Loans | 47,519 | 808
Mortgage, Residential [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 5,662 | 207
Total Loans | 7,379 | 242
Consumer [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Current Loans | 1,727 |
Total Loans | 1,731 |
30-89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 1,469 | 259
30-89 Days Past Due [Member] | Construction, Commercial [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 8 |
30-89 Days Past Due [Member] | Mortgage, Commercial [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 722 | 224
30-89 Days Past Due [Member] | Mortgage, Residential [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 739 | $ 35
Greater than 90 Days Past Due & Accruing [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 1,208 |
Greater than 90 Days Past Due & Accruing [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 187 |
Greater than 90 Days Past Due & Accruing [Member] | Construction, Commercial [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 10 |
Greater than 90 Days Past Due & Accruing [Member] | Mortgage, Commercial [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 29 |
Greater than 90 Days Past Due & Accruing [Member] | Mortgage, Residential [Member] | Real Estate [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | 978 |
Greater than 90 Days Past Due & Accruing [Member] | Consumer [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Days past due | $ 4 |

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