STOCK-BASED COMPENSATION - Activity of the restricted stock awards (Details 1) - Restricted Stock - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Restricted Shares Outstanding      
Balance 36,690 66,231 62,363
Granted 31,466 33,136
Vested [1] (25,207) (29,261) (29,268)
Forfeited (280)
Balance 42,949 36,690 66,231
Weighted-Average Grant Date Fair Value      
Balance $ 18.70 $ 18.62 $ 16.50
Granted 33.68 23.80
Vested [1] 23.58 19.26 19.26
Forfeited 16.50
Balance $ 26.80 $ 18.70 $ 18.62
[1] The terms of the restricted stock agreements permit the surrender of shares to the Company upon vesting in order to satisfy applicable tax withholding at the minimum statutory withholding rate, and accordingly 7,851 shares, 7,715 shares and 5,821 shares were surrendered during 2016, 2015 and 2014, respectively.