GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details) - USD ($)		6 Months Ended	11 Months Ended	12 Months Ended
	Jul. 01, 2024	Dec. 31, 2024	Nov. 30, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Goodwill		$ 68,106,000		$ 68,106,000	$ 18,724,000	$ 18,724,000
Impairments			$ 0	0	0
Other intangible assets, net		47,765,000		47,765,000	2,414,000	3,078,000
Impairment of intangibles				0	0
Amortization expense				5,742,000	953,000	$ 1,105,000
Codorus Valley Bancorp, Inc
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 49,400,000
Investment Advisory
Finite-Lived Intangible Assets [Line Items]
Total assets acquired	85,000,000.0
Investment Advisory Firm
Finite-Lived Intangible Assets [Line Items]
Total assets acquired					67,200,000
Core deposit intangible
Finite-Lived Intangible Assets [Line Items]
Acquired customer relationship intangible				40,140,000	0
Core deposit intangible | Codorus Valley Bancorp, Inc
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, net		4,300,000
Deferred tax liabilities		974,000
Other intangible assets, net	40,100,000
Deferred tax liabilities	9,100,000
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Acquired customer relationship intangible				$ 10,953,000	$ 289,000
Customer relationships | Codorus Valley Bancorp, Inc
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, net		179,000
Deferred tax liabilities		$ 41,000
Other intangible assets, net	10,600,000
Deferred tax liabilities	$ 2,400,000
Expected life (in years)	7 years
Other intangible assets, net	$ 374,000
Customer relationships | Investment Advisory Firm
Finite-Lived Intangible Assets [Line Items]
Expected life (in years)					7 years
Acquired customer relationship intangible					$ 289,000
Customer-related intangibles | Codorus Valley Bancorp, Inc
Finite-Lived Intangible Assets [Line Items]
Expected life (in years)	10 years