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SHARE-BASED COMPENSATION PLANS - Summary of Outstanding Stock Options (Detail) - Orrstown 2011 Incentive Stock Plan - Employee Stock Option
3 Months Ended
Mar. 31, 2016
$ / shares
shares
Shares  
Outstanding at beginning of year (in shares) | shares 101,460
Forfeited (in shares) | shares (2,050)
Options outstanding and exercisable, at period end (in shares) | shares 99,410
Weighted Average Exercise Price  
Outstanding at beginning of year (in usd per share) | $ / shares $ 28.72
Forfeited (in usd per share) | $ / shares 26.54
Options outstanding and exercisable, at period end (in usd per share) | $ / shares $ 28.76