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MERGER - Summary of Purchase Price Consideration Paid (Details) - Codorus Valley $ / shares in Units, $ in Thousands | Jul. 01, 2024 USD ($) shares | Jun. 28, 2024 $ / shares
--- | --- | ---
Business Combination [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 Combination [Line Items] |  |
Per common share exchange ratio | 0.875 |
Orrstown Financial Services Inc |  |
Business Combination [Line Items] |  |
Orrstown common stock price per common share - closing stock price as of June 28, 2024 (usd per share) | $ / shares |  | $ 27.36
Common Stock |  |
Business Combination [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 Combination [Line Items] |  |
Shares issued for common stock - as exchanged (in shares) | 8,532,038 |

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