MERGER - Schedule of Purchase Price Consideration Paid (Details) - Codorus Valley $ / shares in Units, $ in Thousands	Jul. 01, 2024 USD ($) shares	Jun. 28, 2024 $ / shares
Business Acquisition [Line Items]
Fractional shares of common stock to be paid in cash (in shares)	(370)
Purchase price merger consideration for Codorus Valley | $	$ 233,437
Common Stock
Business Acquisition [Line Items]
Per common share exchange ratio	0.875
Orrstown Financial Services Inc
Business Acquisition [Line Items]
Orrstown common stock price per common share - closing stock price as of June 28, 2024 (in dollars per share) | $ / shares		$ 27.36
Common Stock
Business Acquisition [Line Items]
Number of shares of Codorus Valley common stock outstanding (in shares)	9,751,323
Shares issued for common stock - as exchanged (in shares)	8,532,408
Common Stock | Orrstown Financial Services Inc
Business Acquisition [Line Items]
Shares issued for common stock - as exchanged (in shares)	8,532,038