EARNINGS PER SHARE (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
EARNINGS PER SHARE
Net Income	$ 3,410,000	$ 3,360,000	$ 3,063,000	$ 2,939,000	$ 2,950,000	$ 2,773,000	$ 2,476,000	$ 2,160,000	$ 12,772,000	$ 10,359,000	$ 9,166,000
Less: Dividends paid on and earnings allocated to participating securities									(328,000)	(299,000)	(243,000)
Income attributable to common stock									12,444,000	10,060,000	8,923,000
Weighted average common shares outstanding, including participating securities									8,633,000	6,712,000	6,308,000
Less: weighted average participating securities (in shares)									(223,000)	(193,000)	(170,000)
Weighted average common shares outstanding									8,410,000	6,519,000	6,138,000
Basic earnings per common share (in dollars per share)	$ 0.39	$ 0.39	$ 0.36	$ 0.35	$ 0.42	$ 0.41	$ 0.38	$ 0.34	$ 1.48	$ 1.54	$ 1.45
Income attributable to common stock									12,444,000	10,060,000	8,923,000
Weighted average common shares outstanding									8,410,000	6,519,000	6,138,000
Weighted average common equivalent shares outstanding									1,000	1,000	1,000
Weighted average common and equivalent shares outstanding									8,411,000	6,520,000	6,139,000
Diluted earnings per common share (in dollars per share)	$ 0.39	$ 0.39	$ 0.36	$ 0.35	$ 0.42	$ 0.41	$ 0.38	$ 0.34	$ 1.48	$ 1.54	$ 1.45
Stock options
Antidilutive securities
Stock Options not included in the computation of diluted earnings per share (in shares)									49,362
Convertible trust preferred securities
Antidilutive securities
Outstanding amount of securities not included in computation of diluted earnings per share	$ 16,000,000								$ 16,000,000