EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net Income
Net income	$ 7,632	$ 6,986	$ 18,947	$ 19,979
Redemption of preferred shares	(148)		(148)	1,302
Preferred dividends and accretion	(99)	(458)	(504)	(1,694)
Net income available to common shareholders	7,385	6,528	18,295	19,587
Net income available to common shareholders and assumed conversions	$ 7,385	$ 6,528	$ 18,295	$ 19,587
Weighted Average Shares
Net income available to common shareholders (in shares)	20,400,808	20,289,609	20,363,514	20,253,560
Effect of Dilutive stock options (in shares)	51,013	57,989	56,681	59,400
Net income available to common shareholders and assumed conversions (in shares)	20,451,821	20,347,598	20,420,195	20,312,960
Per Share Amount
Net income available to common shareholders (in dollars per share)	$ 0.36	$ 0.32	$ 0.90	$ 0.97
Net income available to common shareholders and assumed conversions (in dollars per share)	$ 0.36	$ 0.32	$ 0.90	$ 0.96
Stock options
Anti-dilutive securities
Common shares not considered in computing diluted earnings per share	290,146	306,929	284,407	286,943
Stock warrants
Anti-dilutive securities
Common shares not considered in computing diluted earnings per share	571,906	571,906	571,906	571,906