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EARNINGS PER SHARE - Reconciliation of weighted average shares outstanding (Details) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Earnings Per Share        
Net income available for stockholders $ 4,429 $ 3,013 $ 7,358 $ 4,991
Less: Dividends paid (1,532) (1,147) (3,063) (2,291)
Undistributed earnings $ 2,897 $ 1,866 $ 4,295 $ 2,700
Basic shares outstanding:        
Common stock 35,771 35,741 35,775 35,743
Restricted shares of common stock 1,255 1,248 1,250 1,230
Basic shares outstanding, Total 37,026 36,989 37,025 36,973
Diluted shares outstanding:        
Common stock 35,771 35,741 35,775 35,743
Dilutive effect of stock based awards 94 191 199 267
Diluted shares outstanding excluding restricted shares of common stock, Total 35,865 35,932 35,974 36,010
Restricted shares of common stock 1,255 1,248 1,250 1,230
Diluted shares outstanding, Total 37,120 37,180 37,224 37,240