EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Computation of Basic and Diluted Shares
Net income	$ 9,795	$ 8,591	$ 15,405	$ 14,153
Weighted average shares outstanding - basic (shares)	7,806,031	7,523,347	7,701,707	7,499,016
Dilutive potential shares from unvested restricted shares (shares)	155,375	155,685	275,083	275,394
Weighted average shares outstanding - diluted (shares)	7,961,406	7,679,032	7,976,790	7,774,410
Earnings per share:
Basic (dollars per share)	$ 1.25	$ 1.14	$ 2.00	$ 1.89
Diluted (dollars per share)	$ 1.23	$ 1.12	$ 1.93	$ 1.82