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MERGER - Narrative (Details) $ / shares in Units, $ in Thousands |  | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 01, 2024 USD ($) $ / shares shares | Sep. 30, 2025 USD ($) $ / shares | Dec. 31, 2024 USD ($) $ / shares | Jun. 28, 2024 $ / shares | Dec. 31, 2023 USD ($)
Business Combination [Line Items] |  |  |  |  |
Common stock, stated value (in usd per share) | $ / shares |  | $ 0.05205 | $ 0.05205 |  |
Goodwill |  | $ 69,751 | $ 68,106 |  | $ 18,724
Adjustments to acquired goodwill |  | 1,645 | $ 0 |  |
Codorus Valley |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |
Consideration transferred | $ 233,400 |  |  |  |
Goodwill | $ 49,400 | 51,000 |  |  |
Adjustments to acquired goodwill |  | $ 1,600 |  |  |
Estimated useful life (in years) | 40 years |  |  |  |
Operating lease assets acquired | $ 5,100 |  |  |  |
Operating lease liabilities acquired | 5,100 |  |  |  |
Finance lease asset acquired | 392 |  |  |  |
Finance lease liability acquired | 392 |  |  |  |
Fair value adjustments of operating lease assets | (1,100) |  |  |  |
Fair value adjustments of finance lease assets | (133) |  |  |  |
Adjustments to deposits | 3,200 |  |  |  |
Codorus Valley | Subordinated notes |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |
Unamortized discount | 2,400 |  |  |  |
Codorus Valley | Junior Subordinated Debt |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |
Unamortized discount | 2,700 |  |  |  |
Codorus Valley | Premises and Equipment |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |
Adjustment to premises and equipment | 6,600 |  |  |  |
Codorus Valley | Core deposit intangible |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |
Other intangible assets, net | 40,100 |  |  |  |
Codorus Valley | Customer relationship |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |
Other intangible assets, net | $ 10,600 |  |  |  |
Expected life (in years) | 10 years |  |  |  |
Common Stock | Codorus Valley |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |
Business combination, shares of common stock to be received by acquiree for number of shares outstanding ratio | 0.875 |  |  |  |
Codorus Valley | Common Stock | Codorus Valley |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |
Common stock, stated value (in usd per share) | $ / shares | $ 2.50 |  |  |  |
Orrstown Financial Services Inc | Codorus Valley |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |
Shares issued for common stock (in shares) | shares | 8,532,038 |  |  |  |
Share price (in usd per share) | $ / shares |  |  |  | $ 27.36 |

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