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SHARE-BASED COMPENSATION PLANS - Summary of Outstanding Stock Options Activity (Details)
3 Months Ended
Mar. 31, 2020
$ / shares
shares
Shares  
Options exercisable (in shares) | shares 30,459
Weighted Average Exercise Price  
Options exercisable at period end (in usd per share) | $ / shares $ 21.56
Orrstown 2011 Incentive Stock Plan | Employee Stock Option  
Shares  
Outstanding at beginning of year (in shares) | shares 30,559
Forfeited (in shares) | shares (100)
Options outstanding at period end (in shares) | shares 30,459
Weighted Average Exercise Price  
Outstanding at beginning of year (in usd per share) | $ / shares $ 21.56
Forfeited (in usd per share) | $ / shares 21.14
Options outstanding at period end (in usd per share) | $ / shares $ 21.56