EARNINGS PER COMMON 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
Net Income
Net income	$ 7,398	$ 7,632	$ 7,324	$ 3,991	$ 7,279	$ 6,986	$ 6,982	$ 6,011	$ 26,345	$ 27,258	$ 23,813
Preferred dividends and discount accretion									(504)	(2,110)	(3,054)
Redemption of preferred shares									(148)	1,357
Net income attributable to common shareholders									25,693	26,505	20,759
Net income attributable to common shareholders and assumed conversions									$ 25,693	$ 26,505	$ 20,759
Weighted Average Shares
Net income attributable to common shareholders (in shares)									20,375,365	20,265,761	20,179,512
Effect of dilutive stock options (in shares)									57,487	58,896	41,615
Net income attributable to common shareholders and assumed conversions (in shares)									20,432,852	20,324,657	20,221,127
Per Share Amount
Net income attributable to common shareholders (in dollars per share)	$ 0.36	$ 0.36	$ 0.35	$ 0.19	$ 0.34	$ 0.32	$ 0.32	$ 0.32	$ 1.26	$ 1.31	$ 1.03
Net income attributable to common shareholders and assumed conversions (in dollars per share)	$ 0.36	$ 0.36	$ 0.35	$ 0.19	$ 0.34	$ 0.32	$ 0.32	$ 0.32	$ 1.26	$ 1.30	$ 1.03
Stock options
Anti-dilutive securities
Common shares not considered in computing diluted earnings per share									281,589	289,544	254,850
Stock warrants
Anti-dilutive securities
Common shares not considered in computing diluted earnings per share									571,906	571,906	571,906