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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
EARNINGS PER SHARE        
Net Income $ 9,443 $ 8,851 $ 27,455 $ 26,331
Dividends paid on and earnings allocated to participating securities (197) (188) (557) (542)
Income attributable to common stock $ 9,246 $ 8,663 $ 26,898 $ 25,789
Weighted average common shares outstanding, including participating securities 19,793 17,537 19,748 17,511
Weighted average participating securities (in shares) (412) (372) (405) (365)
Weighted average common shares outstanding 19,381 17,165 19,343 17,146
Basic earnings per common share (in dollars per share) $ 0.48 $ 0.50 $ 1.39 $ 1.50
Income attributable to common stock $ 9,246 $ 8,663 $ 26,898 $ 25,789
Impact of assumed conversions - interest on 8.5% trust preferred securities 0 219 32 661
Income attributable to common stock including assumed conversions $ 9,246 $ 8,882 $ 26,930 $ 26,450
Weighted average common shares outstanding 19,381 17,165 19,343 17,146
Incremental shares from assumed conversions of options and restricted stock units 25 15 21 11
Incremental shares from assumed conversions of 8.5% trust preferred securities   546 23 531
Weighted average common and equivalent shares outstanding 19,406 17,726 19,387 17,688
Diluted earnings per common share (in dollars per share) $ 0.48 $ 0.50 $ 1.39 $ 1.50