INCOME TAXES (Additional Information) (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
Income tax expense	$ 3,808,000	$ 4,740,000	$ 4,392,000	$ 4,242,000	$ 3,672,000	$ 4,418,000	$ 4,001,000	$ 2,627,000	$ 17,182,000	$ 14,718,000	$ 12,237,000
Statutory percentage rate of provision									35.00%	35.00%	35.00%
Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross	4,700,000				4,400,000				4,700,000	4,400,000
Deferred Tax Liabilities Allocated To Benefit Plan	1,200,000				1,400,000				1,200,000	1,400,000
Unrecognized tax benefits	89,000				134,000				89,000	134,000	112,000
Security Transaction [Member]
Income tax expense									$ (150,000)	$ (67,000)	$ (2,000)