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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
EARNINGS PER SHARE                      
Net income $ (6,916) $ 9,443 $ 8,841 $ 9,171 $ 9,160 $ 8,851 $ 8,854 $ 8,626 $ 20,539 $ 35,491 $ 21,111
Dividends paid on and earnings allocated to participating securities                 (415) (732) (451)
Income attributable to common stock                 $ 20,124 $ 34,759 $ 20,660
Weighted average common shares outstanding, including participating securities                 19,759 17,670 14,792
Weighted average participating securities (in shares)                 (404) (366) (319)
Weighted average common shares outstanding                 19,355 17,304 14,473
Basic earnings per common share $ (0.35) $ 0.48 $ 0.45 $ 0.47 $ 0.50 $ 0.50 $ 0.51 $ 0.49 $ 1.04 $ 2.01 $ 1.43
Income attributable to common stock                 $ 20,124 $ 34,759 $ 20,660
Impact of assumed conversions - interest on 8.5% trust preferred securities                 0 878 0
Income attributable to common stock including assumed conversions                 $ 20,124 $ 35,637 $ 20,660
Weighted average common shares outstanding                 19,355 17,304 14,473
Incremental shares from assumed conversions of options and restricted stock units                 24 13 4
Incremental shares from assumed conversions of 8.5% trust preferred securities                 0 534 0
Weighted average common and equivalent shares outstanding                 19,379 17,851 14,477
Diluted earnings per common share (in dollars per share) $ (0.35) $ 0.48 $ 0.45 $ 0.47 $ 0.50 $ 0.50 $ 0.50 $ 0.49 $ 1.04 $ 2.00 $ 1.43