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Loans and Allowance for Credit Losses - Narrative (Details) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2023 USD ($) category | Sep. 30, 2023 loan | Sep. 30, 2023 property | Dec. 31, 2022 USD ($)
Financing Receivable, Impaired [Line Items] |  |  |  |
Foreclosed properties held | $ 0.9 |  |  |
Number of points in internal risk rating system | category | 9 |  |  |
Number of categories in internal risk rating system considered as not criticized | category | 6 |  |  |
Commercial relationship credit review threshold amount | $ 1.0 |  |  |
Commercial relationship credit review threshold amount, independent external review | $ 3.0 |  |  |
Past due period before loans placed in non-accrual status | 90 days |  |  |
Recent loan payment history before removal from non-accrual status | 6 months |  |  |
Impaired loans, related reserves | $ 0.0 |  |  | $ 0.0
Liability for unfunded commitments | 1.4 |  |  | $ 0.5
Residential real estate |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Foreclosed properties held | 0.8 |  |  |
Number foreclosed properties held |  | 2,000,000 | 1 |
Investment in loans in the process of foreclosure | 0.2 |  |  |
Residential real estate | Other Loan Relationships |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Foreclosed properties held | $ 0.1 |  |  |
Total commercial |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Number foreclosed properties held | loan |  | 2 |  |

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