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GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details) - USD ($)			3 Months Ended		9 Months Ended
	Jul. 01, 2024	Nov. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Goodwill			$ 70,655,000		$ 70,655,000			$ 18,724,000		$ 18,724,000
Impairment		$ 0	0	$ 0	0	$ 0
Wealth and brokerage businesses totaling			55,313,000		55,313,000			8,679,000
Intangible asset totaling			46,144,000	2,650,000	46,144,000	2,650,000	$ 1,974,000	2,414,000	$ 2,589,000	$ 3,078,000
Impairment of intangibles			0	$ 0	0	$ 0
Codorus Valley
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 51,900,000
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
Finite-Lived Intangible Assets [Line Items]
Wealth and brokerage businesses totaling			$ 44,250,000		$ 44,250,000			$ 8,390,000
Core deposit intangible \| Codorus Valley
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	35,900,000
Customer relationship \| Codorus Valley
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 10,400,000
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