Quarterly report pursuant to Section 13 or 15(d)

NET INCOME PER COMMON SHARE (Details)

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NET INCOME PER COMMON SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Basic net income per common share:        
Net income available to common stockholders, Income (Numerator) $ 7,629 $ 7,338 $ 25,476 $ 28,066
Net income available to common stockholders, Shares (Denominator) (in shares) 11,309,000 11,258,000 11,298,000 11,244,000
Net income available to common stockholders, Per Share Amount (in dollars per share) $ 0.67 $ 0.65 $ 2.25 $ 2.50
Effect of dilutive securities:        
Non-vested restricted stock, Shares (Denominator) (in shares) 13,000 18,000 9,000 25,000
Diluted net income per common share:        
Net income available to common stockholders plus assumed conversions, Income (Numerator) $ 7,629 $ 7,338 $ 25,476 $ 28,066
Net income available to common stockholders plus assumed conversions, Shares (Denominator) (in shares) 11,322,000 11,276,000 11,307,000 11,269,000
Net income available to common stockholders plus assumed conversions, Per Share Amount (in dollars per share) $ 0.67 $ 0.65 $ 2.25 $ 2.49
Restricted Stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share (in shares) 12,781   9,178