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Business and Asset Acquisitions - 2024 Acquisition Source Atlantic (Narrative) (Details) |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 14, 2024 USD ($) branch | Sep. 30, 2025 branch | Aug. 14, 2025 USD ($)
Business Combination [Line Items] |  |  |
Number of branches | branch |  | 36 |
Source Atlantic |  |  |
Business Combination [Line Items] |  |  |
Preliminary purchase price | $ 103,500,000 |  |
Cash acquired from acquisition | $ 4,400,000 |  |
Number of branches | branch | 20 |  |
Other intangible assets: |  |  | $ 2,000,000
Decrease to goodwill |  |  | 727,000
Total purchase consideration exchanged, net of cash acquired |  |  | 311,000
Expected tax deductible goodwill amount | $ 0 |  |
Source Atlantic | Customer relationships |  |  |
Business Combination [Line Items] |  |  |
Other intangible assets: |  |  | 1,242,000
Useful life (in years) | 17 years |  |
Source Atlantic | Trade names |  |  |
Business Combination [Line Items] |  |  |
Other intangible assets: |  |  | $ 804,000
Useful life (in years) | 8 years |  |

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