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SHARE-BASED COMPENSATION PLANS - Narrative (Details) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2025 USD ($) plan shares | Dec. 31, 2024 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of share-based compensation plans | plan | 2 |
Number of shares reserved to be issued (in shares) | 1,045,000 |
Number of shares available to be issued under employee stock purchase plan (in shares) | 665,000 |
Unrecognized compensation expense, recognition period | 1 year 9 months 18 days |
Orrstown Financial Services, Inc. 2025 Incentive Stock Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares reserved to be issued (in shares) | 440,000 |
Number of shares available to be issued under employee stock purchase plan (in shares) | 370,647 |
Orrstown 2011 Incentive Stock Plan | Restricted Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Unrecognized compensation expense | $ | $ 4.7 | $ 3.6
Employee Stock Purchase Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares reserved to be issued (in shares) | 350,000 |
Number of shares available to be issued under employee stock purchase plan (in shares) | 122,980 |
Maximum shares that can be purchased, as percentage of annual salary | 10.00% |
Percentage of value of the shares on the semi-annual offering | 95.00% |

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