GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details) - USD ($)			6 Months Ended	12 Months Ended
	Nov. 30, 2025	Jul. 01, 2024	Jun. 30, 2025	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Goodwill				$ 69,751,000	$ 68,106,000	$ 18,724,000
Adjustments to acquired goodwill				1,645,000	0
Impairments	$ 0			0	0
Other intangible assets, net				37,990,000	47,765,000	2,414,000
Impairment of intangibles				0	0
Amortization expense				$ 9,765,000	$ 5,742,000	$ 953,000
Codorus Valley Bancorp, Inc
Finite-Lived Intangible Assets [Line Items]
Goodwill		$ 49,400,000	$ 51,000,000.0
Adjustments to acquired goodwill			$ 1,600,000
Expected life (in years)		10 years
Codorus Valley Bancorp, Inc | Core deposit intangible
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, net		$ 40,100,000
Codorus Valley Bancorp, Inc | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, net		$ 10,600,000
Expected life (in years)		7 years
Other intangible assets, net		$ 374,000
Investment Advisory
Finite-Lived Intangible Assets [Line Items]
Total assets acquired		$ 85,000,000.0