v3.26.1
SHARE-BASED COMPENSATION PLANS - Narrative (Details)
$ in Millions
6 Months Ended
Jun. 30, 2026
USD ($)
plan
shares
Dec. 31, 2025
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of share-based compensation plans | plan 2  
Unrecognized compensation expense, recognition period 2 years  
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) 178,697  
Orrstown 2011 Incentive Stock Plan | Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation expense | $ $ 7.4 $ 4.0
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) 120,702  
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%