EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share [Abstract]
Net income	$ 10,588	$ 14,655	$ 12,758	$ 12,252	$ 9,968	$ 11,601	$ 8,874	$ 12,183	$ 50,254	$ 42,627	$ 45,436
Weighted Average Shares (in shares)
Basic Shares (in shares)	23,383,608	22,946,308	22,888,155	22,823,753	22,286,841	21,654,188	21,623,827	21,561,006	23,011,814	21,782,499	21,422,757
Effect of dilutive securities (in shares)	97,445	100,806	52,144	46,040	31,502	52,116	20,377	24,481	76,764	29,817	28,830
Weighted average common shares (diluted) (in shares)	23,481,053	23,047,114	22,940,299	22,869,793	22,318,343	21,706,304	21,644,204	21,585,487	23,088,578	21,812,316	21,451,587
Net Income Available to Common Shareholders per Share (in dollars per share)
Basic EPS (in dollars per share)	$ 0.45	$ 0.64	$ 0.56	$ 0.54	$ 0.45	$ 0.54	$ 0.41	$ 0.57	$ 2.18	$ 1.96	$ 2.12
Effect of Dilutive Securities (in dollars per share)										$ (0.01)
Diluted EPS (in dollars per share)	$ 0.45	$ 0.64	$ 0.56	$ 0.54	$ 0.45	$ 0.53	$ 0.41	$ 0.56	$ 2.18	$ 1.95	$ 2.12