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Loans and Allowance for Credit Losses - Modified Payment Status (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2023 | Sep. 30, 2022
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Post- Modification Outstanding Recorded Investment | $ 207 | $ 632 | $ 68
Financial Asset, Not Past Due |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Post- Modification Outstanding Recorded Investment |  | 632 |
Financial Asset, 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Post- Modification Outstanding Recorded Investment |  | 0 |
Financial Asset, 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Post- Modification Outstanding Recorded Investment |  | 0 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Post- Modification Outstanding Recorded Investment |  | 0 |
Residential real estate [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Post- Modification Outstanding Recorded Investment | 207 | 632 | 68
Residential real estate [Member] | Financial Asset, Not Past Due |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Post- Modification Outstanding Recorded Investment |  | 632 |
Residential real estate [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Post- Modification Outstanding Recorded Investment |  | 0 |
Residential real estate [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Post- Modification Outstanding Recorded Investment |  | 0 |
Residential real estate [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Post- Modification Outstanding Recorded Investment |  | 0 |
Residential real estate [Member] | Senior Lien |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Post- Modification Outstanding Recorded Investment | $ 207 | 632 | $ 68
Residential real estate [Member] | Senior Lien | Financial Asset, Not Past Due |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Post- Modification Outstanding Recorded Investment |  | 632 |
Residential real estate [Member] | Senior Lien | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Post- Modification Outstanding Recorded Investment |  | 0 |
Residential real estate [Member] | Senior Lien | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Post- Modification Outstanding Recorded Investment |  | 0 |
Residential real estate [Member] | Senior Lien | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Post- Modification Outstanding Recorded Investment |  | $ 0 |

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