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GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details) - USD ($)			3 Months Ended
	Jul. 01, 2024	Nov. 30, 2023	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Goodwill			$ 68,106,000		$ 68,106,000	$ 18,724,000
Impairment		$ 0	0	$ 0
Intangible asset totaling			45,230,000	2,189,000	$ 47,765,000	$ 2,414,000
Impairment of intangibles			$ 0	$ 0
Codorus Valley
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 49,400,000
Investment Advisory
Finite-Lived Intangible Assets [Line Items]
Investment advisory business and related accounts with assets under management	85,000,000.0
Core deposit intangible \| Codorus Valley
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	40,100,000
Customer relationship \| Codorus Valley
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 10,600,000
Expected life (in years)	10 years
Customer list \| Codorus Valley
Finite-Lived Intangible Assets [Line Items]
Expected life (in years)	7 years
Intangible asset totaling	$ 374,000