SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE (Details) (USD $)	9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Securities sold under agreements to repurchase
Securities sold under agreements to repurchase	$ 13,093,000	$ 16,600,000	$ 16,897,000
Carrying amount of U.S. GSE, mortgage-backed securities and collateralized mortgage obligations that serve as securities under repurchase agreements	17,600,000	23,700,000	22,500,000
Fourth quarter of 2012
Securities sold under agreements to repurchase
Securities sold under agreements to repurchase	3,100,000
First quarter of 2015
Securities sold under agreements to repurchase
Securities sold under agreements to repurchase	10,000,000
Securities sold under agreements to repurchase
Securities sold under agreements to repurchase
Average daily balance	13,018,000	16,573,000	16,715,000
Average interest rate (as a percent)	3.05%	3.26%	3.23%
Maximum month-end balance	$ 16,722,000	$ 17,012,000	$ 17,469,000
Weighted average interest rate (as a percent)	3.04%	3.20%	3.18%