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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, 2022 | Dec. 31, 2021
30-89 Days Past Due [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | $ 354 | $ 147
30-89 Days Past Due [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 0 | 0
30-89 Days Past Due [Member] | Construction, Commercial [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 0 | 0
30-89 Days Past Due [Member] | Mortgage, Commercial [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 0 | 0
30-89 Days Past Due [Member] | Mortgage, Residential [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 354 | 147
30-89 Days Past Due [Member] | Consumer [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 0 | 0
Greater than 90 Days Past Due & Accruing [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 0 | 4
Greater than 90 Days Past Due & Accruing [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 0 | 0
Greater than 90 Days Past Due & Accruing [Member] | Construction, Commercial [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 0 | 0
Greater than 90 Days Past Due & Accruing [Member] | Mortgage, Commercial [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 0 | 0
Greater than 90 Days Past Due & Accruing [Member] | Mortgage, Residential [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 0 | 0
Greater than 90 Days Past Due & Accruing [Member] | Consumer [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 0 | 4
Current [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 58,394 | 83,878
Current [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 1,481 | 8,903
Current [Member] | Construction, Commercial [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 7 | 14,754
Current [Member] | Mortgage, Commercial [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 51,223 | 51,872
Current [Member] | Mortgage, Residential [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 5,324 | 7,474
Current [Member] | Consumer [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 359 | 875
Total Loan [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 58,748 | 84,029
Total Loan [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 1,481 | 8,903
Total Loan [Member] | Construction, Commercial [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 7 | 14,754
Total Loan [Member] | Mortgage, Commercial [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 51,223 | 51,872
Total Loan [Member] | Mortgage, Residential [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | 5,678 | 7,621
Total Loan [Member] | Consumer [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Purchase loans | $ 359 | $ 879

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