EARNINGS PER SHARE (EPS) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
EARNINGS PER SHARE (EPS) [Abstract]
Net income	$ 11,765	$ 10,631	$ 32,259	$ 33,240
Less: Dividends paid on earnings allocated to participating securities	(41)	(44)	(128)	(135)
Income attributable to common stock	11,724	10,587	32,131	33,105
Weighted Average Number Of Shares Outstanding Including Participating Securities Basic (in shares)	36,215,186	35,664,100	36,164,129	35,371,184
Less: weighted average participating securities (in shares)	(295,044)	(318,314)	(305,615)	(321,325)
Weighted average shares outstanding utilized in the calculation of basic EPS (in shares)	35,920,142	35,345,786	35,858,514	35,049,859
Earnings Per Share, Basic (in dollars per share)	$ 0.33	$ 0.30	$ 0.90	$ 0.95
Income attributable to common stock	$ 11,724	$ 10,587	$ 32,131	$ 33,105
Weighted average common shares outstanding	35,920,142	35,345,786	35,858,514	35,049,859
Common stock equivalents resulting from the dilutive effect of "in-the-money" stock options	54,197	181,717	82,231	107,788
Weighted average shares outstanding utilized in the calculation of diluted EPS (in shares)	35,974,339	35,527,503	35,940,745	35,157,647
Earnings Per Share, Diluted (in dollars per share)	$ 0.33	$ 0.30	$ 0.90	$ 0.95
Weighted average shares excluded from earnings per share calculation (in shares)	270,996	761,193	309,444	919,821