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Loans and the Allowance for Credit Losses - Loans Identified as TDRs (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 USD ($) Contract | Dec. 31, 2021 USD ($) Contract
Financing Receivable, Modifications [Line Items] |  |
Number of Modifications | Contract | 3 | 3
Pre-Modification Outstanding Recorded Investment | $ 1,370 | $ 338
Post-Modification Outstanding Recorded Investment |  | $ 326
Commercial and Industrial [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Modifications | Contract |  | 1
Pre-Modification Outstanding Recorded Investment |  | $ 178
Post-Modification Outstanding Recorded Investment |  | $ 172
Commercial Real Estate [Member] | Commercial Real Estate - Land and Construction [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Modifications | Contract | 1 |
Pre-Modification Outstanding Recorded Investment | $ 84 |
Commercial Real Estate [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Modifications | Contract | 3 |
Pre-Modification Outstanding Recorded Investment | $ 1,370 |
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Modifications | Contract | 2 |
Pre-Modification Outstanding Recorded Investment | $ 1,286 |
Residential Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Modifications | Contract |  | 1
Pre-Modification Outstanding Recorded Investment |  | $ 103
Post-Modification Outstanding Recorded Investment |  | $ 100
Home Equity [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Modifications | Contract |  | 1
Pre-Modification Outstanding Recorded Investment |  | $ 57
Post-Modification Outstanding Recorded Investment |  | $ 54

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