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SHARE-BASED COMPENSATION PLANS - Summary of Outstanding Stock Options Activity (Details)
Mar. 31, 2019
$ / shares
shares
Shares  
Options exercisable (in shares) | shares 40,984
Weighted Average Exercise Price  
Options exercisable at period end (in usd per share) | $ / shares $ 24.34
Orrstown 2011 Incentive Stock Plan | Employee Stock Option  
Shares  
Options outstanding (in shares) | shares 40,984
Weighted Average Exercise Price  
Options outstanding, weighted average exercise price (in usd per share) | $ / shares $ 24.34