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