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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