RETIREMENT PLANS (Detail)	12 Months Ended
	Dec. 31, 2024 USD ($) plan	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Plan participant service requirement, period	1 month
Plan participant age required	18 years
Maximum annual contributions per employee	$ 69,000
Maximum annual contributions per employee, percent	100.00%
Employer matching contribution, percent of match of base contribution by employee	0.50
Employer matching contribution, percent of employee contribution	6.00%
Employer contribution expense	$ 1,200,000	$ 859,000	$ 780,000
Director | Codorus Valley Bancorp, Inc
Defined Benefit Plan Disclosure [Line Items]
Estimated present value of future benefits to be paid	$ 245,000
Deferred compensation arrangement
Defined Benefit Plan Disclosure [Line Items]
Age at which a director or his beneficiaries will receive a monthly retirement benefit	65 years
Estimated present value of future benefits to be paid	$ 193,000	0
Plan expense	4,000	2,000	4,000
Supplemental discretionary deferred compensation plans
Defined Benefit Plan Disclosure [Line Items]
Plan expense	35,000	51,000	51,000
Trust account balance	7,900,000	2,200,000
Supplemental discretionary deferred compensation plans | Codorus Valley Bancorp, Inc
Defined Benefit Plan Disclosure [Line Items]
Trust account balance	5,600,000
Supplemental retirement and salary continuation plans
Defined Benefit Plan Disclosure [Line Items]
Estimated present value of future benefits to be paid	$ 26,300,000	14,900,000
Number of supplemental retirement and salary continuation plans | plan	2
Supplemental retirement and salary continuation plans | Codorus Valley Bancorp, Inc
Defined Benefit Plan Disclosure [Line Items]
Supplement plan expenses	$ 4,300,000	1,900,000	2,000,000.0
Supplemental retirement and salary continuation plans | Executives And Directors | Codorus Valley Bancorp, Inc
Defined Benefit Plan Disclosure [Line Items]
Liabilities assumed for supplemental retirement and deferred compensation plans	8,100,000
Life insurance coverage post-retirement
Defined Benefit Plan Disclosure [Line Items]
Estimated present value of future benefits to be paid	2,600,000	1,800,000
Life insurance coverage post-retirement | Codorus Valley Bancorp, Inc
Defined Benefit Plan Disclosure [Line Items]
Plan expense	105,000	$ 130,000	$ 105,000
Post retirement liabilities assumed	$ 656,000