SHARE-BASED COMPENSATION PLANS - Summary of Outstanding Stock Options Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2023
Shares
Outstanding at beginning of year (in shares)		0
Options outstanding and exercisable, at year end (in shares)	50,007	50,007
Options exercisable (in shares)	50,007	50,007	0
Employee Stock Option | Codorus Valley Bancorp, Inc
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercisable, Weighted average remaining contractual life (in years)		1 year 10 months 24 days
Shares
Outstanding at beginning of year (in shares)	0
Assumed from Merger (in shares)	80,227
Exercised (in shares)	(28,139)
Expired (in shares)	(2,081)
Options outstanding and exercisable, at year end (in shares)	50,007	50,007
Fully vested and expected to vest (in shares)	50,007	50,007
Options exercisable (in shares)	50,007	50,007
Weighted Average Exercise Price
Outstanding at beginning of year (in dollars per share)	$ 0
Assumed from Merger (in usd per share)	21.96
Exercised (in usd per share)	20.20
Expired (in dollars per share)	17.64
Options outstanding and exercisable, at year end (in dollars per share)	23.13	$ 23.13
Fully vested and expected to vest (in usd per share)	23.13	23.13
Exercisable at period end (in usd per share)	$ 23.13	$ 23.13
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]
Total intrinsic value of options exercised		$ 474
Cash received from options exercised		568
Tax benefit realized from stock options exercised		$ 72