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SHARE-BASED COMPENSATION PLANS - Summary of Outstanding Stock Options Activity (Detail) - 2011 Incentive Stock Plan - Employee Stock Option
 12 Months Ended
Dec. 31, 2017
$ / shares
shares
Shares  
Outstanding at beginning of year (in shares) | shares 80,370
Forfeited (in shares) | shares (1,300)
Expired (in shares) | shares (19,487)
Options outstanding and exercisable, at year end (in shares) | shares 59,583
Weighted Average Exercise Price  
Outstanding at beginning of year (in dollars per share) | $ / shares $ 27.37
Forfeited (in dollars per share) | $ / shares 21.14
Expired (in dollars per share) | $ / shares 32.33
Options outstanding and exercisable, at year end (in dollars per share) | $ / shares $ 25.89