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Loans and Allowance for Loan Losses - Summary of Investment of PCI Loans (Detail) - Real Estate [Member] - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 | Dec. 31, 2021
30-89 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Purchase loans | $ 553 | $ 147
30-89 Days Past Due [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Purchase loans | 0 | 0
30-89 Days Past Due [Member] | Construction, commercial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Purchase loans | 0 | 0
30-89 Days Past Due [Member] | Mortgage, Commercial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Purchase loans | 0 | 0
30-89 Days Past Due [Member] | Mortgage, Residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Purchase loans | 553 | 147
30-89 Days Past Due [Member] | Consumer [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Purchase loans | 0 | 0
Greater than 90 Days Past Due & Accruing [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Purchase loans | 0 | 4
Greater than 90 Days Past Due & Accruing [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Purchase loans | 0 | 0
Greater than 90 Days Past Due & Accruing [Member] | Construction, commercial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Purchase loans | 0 | 0
Greater than 90 Days Past Due & Accruing [Member] | Mortgage, Commercial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Purchase loans | 0 | 0
Greater than 90 Days Past Due & Accruing [Member] | Mortgage, Residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Purchase loans | 0 | 0
Greater than 90 Days Past Due & Accruing [Member] | Consumer [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Purchase loans | 0 | 4
Current [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Purchase loans | 64,637 | 83,878
Current [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Purchase loans | 3,461 | 8,903
Current [Member] | Construction, commercial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Purchase loans | 1,201 | 14,754
Current [Member] | Mortgage, Commercial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Purchase loans | 54,433 | 51,872
Current [Member] | Mortgage, Residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Purchase loans | 5,179 | 7,474
Current [Member] | Consumer [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Purchase loans | 363 | 875
Total Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Purchase loans | 65,190 | 84,029
Total Loans [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Purchase loans | 3,461 | 8,903
Total Loans [Member] | Construction, commercial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Purchase loans | 1,201 | 14,754
Total Loans [Member] | Mortgage, Commercial [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Purchase loans | 54,433 | 51,872
Total Loans [Member] | Mortgage, Residential [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Purchase loans | 5,732 | 7,621
Total Loans [Member] | Consumer [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Purchase loans | $ 363 | $ 879

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