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Loans and Allowance for Loan Losses - Summary of Purchased Loans (Detail) - Real Estate [Member] - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
30-89 Days Past Due [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | $ 147 | $ 259
30-89 Days Past Due [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 0 |
30-89 Days Past Due [Member] | Construction, Commercial [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 0 |
30-89 Days Past Due [Member] | Mortgage, Commercial [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 0 | 224
30-89 Days Past Due [Member] | Mortgage, Residential [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 147 | 35
30-89 Days Past Due [Member] | Consumer Loans [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans |  |
Greater than 90 Days Past Due & Accruing [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 4 |
Greater than 90 Days Past Due & Accruing [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans |  |
Greater than 90 Days Past Due & Accruing [Member] | Construction, Commercial [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 0 |
Greater than 90 Days Past Due & Accruing [Member] | Mortgage, Commercial [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 0 |
Greater than 90 Days Past Due & Accruing [Member] | Mortgage, Residential [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 0 |
Greater than 90 Days Past Due & Accruing [Member] | Consumer Loans [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 4 |
Current [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 83,878 | 826
Current [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 8,903 |
Current [Member] | Construction, Commercial [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 14,754 | 35
Current [Member] | Mortgage, Commercial [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 51,872 | 584
Current [Member] | Mortgage, Residential [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 7,474 | 207
Current [Member] | Consumer Loans [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 875 |
Total Loan [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 84,029 | 1,085
Total Loan [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 8,903 |
Total Loan [Member] | Construction, Commercial [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 14,754 | 35
Total Loan [Member] | Mortgage, Commercial [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 51,872 | 808
Total Loan [Member] | Mortgage, Residential [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 7,621 | $ 242
Total Loan [Member] | Consumer Loans [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | $ 879 |

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