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GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 01, 2024
Nov. 30, 2023
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]                    
Goodwill     $ 69,751,000   $ 69,751,000   $ 68,106,000     $ 18,724,000
Adjustments to acquired goodwill         1,645,000   0      
Impairment   $ 0 0 $ 0 0 $ 0        
Intangible asset totaling     40,338,000 46,144,000 40,338,000 46,144,000 $ 47,765,000 $ 42,748,000 $ 1,974,000 $ 2,414,000
Impairment of intangibles     0 $ 0 0 $ 0        
Codorus Valley                    
Finite-Lived Intangible Assets [Line Items]                    
Goodwill $ 49,400,000   $ 51,000,000.0   51,000,000.0          
Adjustments to acquired goodwill         $ 1,600,000          
Codorus Valley | Core deposit intangible                    
Finite-Lived Intangible Assets [Line Items]                    
Intangible assets acquired 40,100,000                  
Codorus Valley | Customer relationship                    
Finite-Lived Intangible Assets [Line Items]                    
Intangible assets acquired $ 10,600,000                  
Expected life (in years) 10 years                  
Codorus Valley | Customer list                    
Finite-Lived Intangible Assets [Line Items]                    
Expected life (in years) 7 years                  
Intangible asset totaling $ 374,000                  
Investment Advisory                    
Finite-Lived Intangible Assets [Line Items]                    
Investment advisory business and related accounts with assets under management $ 85,000,000.0