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SHARE-BASED COMPENSATION PLANS - Summary of Restricted Shares Compensation Expense (Details) - Orrstown 2011 Incentive Stock Plan - Restricted Stock - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted share award expense $ 1,776 $ 1,287 $ 3,309 $ 2,641
Restricted share award tax benefit 373 270 695 555
Fair value of shares vested $ 3,013 $ 30 $ 5,666 $ 1,506