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SHARE-BASED COMPENSATION PLANS - Summary of Nonvested Restricted Shares Activity (Details) - 2011 Incentive Stock Plan - Restricted stock awards
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Shares  
Nonvested shares, beginning of year (in shares) | shares 227,337
Granted (in shares) | shares 67,753
Forfeited (in shares) | shares (13,079)
Vested (in shares) | shares (13,600)
Nonvested shares, at end of year (in shares) | shares 268,411
Weighted Average Grant Date Fair Value  
Nonvested shares, beginning of year (in dollars per share) | $ / shares $ 16.88
Granted (in dollars per share) | $ / shares 22.52
Forfeited (in dollars per share) | $ / shares 18.36
Vested (in dollars per share) | $ / shares 17.95
Nonvested shares, at end of year (in dollars per share) | $ / shares $ 18.18