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GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details) - USD ($)			3 Months Ended		6 Months Ended
	Jul. 01, 2024	Nov. 30, 2023	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Goodwill			$ 69,751,000		$ 69,751,000			$ 68,106,000		$ 18,724,000
Impairment		$ 0	0	$ 0	0	$ 0
Intangible asset totaling			42,748,000	1,974,000	42,748,000	1,974,000	$ 45,230,000	$ 47,765,000	$ 2,189,000	$ 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
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

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