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RECENT ACCOUNTING PRONOUNCEMENTS (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
$ / shares
Jun. 30, 2016
USD ($)
$ / shares
 [1]
Jun. 30, 2017
USD ($)
$ / shares
Jun. 30, 2016
USD ($)
$ / shares
Accounting Changes and Error Corrections [Abstract]        
Net income | $ $ 10,234 $ 9,616 $ 20,310 $ 18,262
Basic earnings per share (in dollars per share) $ 0.66 [2] $ 0.62 [2] $ 1.31 $ 1.18
Diluted earnings per share (in dollars per share) $ 0.66 [2] $ 0.62 [2] $ 1.30 $ 1.18
Stock split conversion ratio     1.5  
[1] Share and per share amounts for the three and six months ended June 30, 2016 have been adjusted to reflect the three-for-two stock split effective September 30, 2016.
[2] Represents dividends paid and undistributed earnings allocated to nonvested stock-based awards that contain non-forfeitable rights to dividends.