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SHARE-BASED COMPENSATION PLANS - Summary of Outstanding Stock Options (Details)
 9 Months Ended
Sep. 30, 2017
$ / shares
shares
Shares  
Options exercisable at period end (in shares) | shares 59,783
Weighted Average Exercise Price  
Options exercisable at period end (in usd per share) | $ / shares $ 25.87
Orrstown 2011 Incentive Stock Plan | Employee Stock Option  
Shares  
Outstanding at beginning of year (in shares) | shares 80,370
Forfeited (in shares) | shares (1,100)
Expired (in shares) | shares (19,487)
Options outstanding at period end (in shares) | shares 59,783
Weighted Average Exercise Price  
Outstanding at beginning of year (in usd per share) | $ / shares $ 27.37
Forfeited (in usd per share) | $ / shares 21.14
Expired (in usd per share) | $ / shares 32.33
Options outstanding at period end (in usd per share) | $ / shares $ 25.87