EARNINGS PER COMMON SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net Income
Net income	$ 6,560	$ 8,457	$ 7,754	$ 6,225	$ 7,398	$ 7,632	$ 7,324	$ 3,991	$ 28,996	$ 26,345	$ 27,258
Preferred dividends and discount accretion										(504)	(2,110)
Redemption of preferred shares									0	(148)	1,357
Net income attributable to common shareholders									28,996	25,693	26,505
Net income attributable to common shareholders and assumed conversions									$ 28,996	$ 25,693	$ 26,505
Weighted Average Shares
Net income attributable to common shareholders (in shares)									20,706,688	20,375,365	20,265,761
Effect of dilutive warrants (in shares)									76,828
Effect of dilutive stock options (in shares)									70,552	57,487	58,896
Net income attributable to common shareholders and assumed conversions (in shares)									20,854,068	20,432,852	20,324,657
Per Share Amount
Net income attributable to common shareholders (in dollars per share)	$ 0.31	$ 0.41	$ 0.38	$ 0.30	$ 0.36	$ 0.36	$ 0.35	$ 0.19	$ 1.40	$ 1.26	$ 1.31
Net income attributable to common shareholders and assumed conversions (in dollars per share)	$ 0.30	$ 0.41	$ 0.38	$ 0.30	$ 0.36	$ 0.36	$ 0.35	$ 0.19	$ 1.39	$ 1.26	$ 1.30
Stock options
Anti-dilutive securities
Common shares not considered in computing diluted earnings per share									125,530	281,589	289,544
Stock warrants
Anti-dilutive securities
Common shares not considered in computing diluted earnings per share										571,906	571,906