EARNINGS PER SHARE (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net Income
Preferred dividends and accretion											$ (504,000)
Redemption of preferred shares									$ 0		(148,000)
Net income attributable to common shareholders									35,542,000	$ 28,996,000	25,693,000
Net income attributable to common shareholders and assumed conversions									$ 35,542,000	$ 28,996,000	$ 25,693,000
Weighted Average Shares
Basic Weighted Average Shares									21,637,775	20,706,688	20,375,365
Effect of dilutive warrants (in shares)									163,011	76,828	0
Effect of dilutive stock options (in shares)										70,552	57,487
Diluted Weighted Average Shares									21,909,370	20,854,068	20,432,852
Earnings per Common Share
Basic Per Share Amount (per share)	$ 0.42	$ 0.42	$ 0.45	$ 0.35	$ 0.31	$ 0.41	$ 0.38	$ 0.30	$ 1.64	$ 1.40	$ 1.26
Diluted Per Share Amount (in dollars per share)	$ 0.42	$ 0.42	$ 0.44	$ 0.35	$ 0.30	$ 0.41	$ 0.38	$ 0.30	$ 1.62	$ 1.39	$ 1.26
Stock warrants
Weighted Average Shares
Effect of dilutive warrants (in shares)									163,011
Earnings per Common Share
Common shares not considered in computing diluted earnings per share											571,906
Stock options
Weighted Average Shares
Effect of dilutive stock options (in shares)									108,584
Earnings per Common Share
Common shares not considered in computing diluted earnings per share									452	125,530	281,589