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SHARE-BASED COMPENSATION PLANS - Summary of Outstanding Stock Options (Details)
 3 Months Ended
Mar. 31, 2018
$ / shares
shares
Shares  
Exercised (in shares) | shares (300)
Options exercisable at period end (in shares) | shares 58,403
Weighted Average Exercise Price  
Exercised (in usd per share) | $ / shares $ 21.14
Options exercisable at period end (in usd per share) | $ / shares $ 25.89
Orrstown 2011 Incentive Stock Plan | Employee Stock Option  
Shares  
Outstanding at beginning of year (in shares) | shares 59,583
Forfeited (in shares) | shares (880)
Options outstanding at period end (in shares) | shares 58,403
Weighted Average Exercise Price  
Outstanding at beginning of year (in usd per share) | $ / shares $ 25.89
Forfeited (in usd per share) | $ / shares 27.55
Options outstanding at period end (in usd per share) | $ / shares $ 25.89