SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Securities sold under agreements to repurchase
Securities sold under agreements to repurchase	$ 12,821,000	$ 11,500,000	$ 12,390,000
Carrying amount of U.S. GSE, mortgage-backed securities and collateralized mortgage obligations that serve as securities under repurchase agreements	15,900,000	18,800,000	17,100,000
Second quarter of 2013
Securities sold under agreements to repurchase
Securities sold under agreements to repurchase	2,800,000
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	12,817,000	13,857,000	13,016,000
Average interest rate (as a percent)	2.91%	3.19%	3.01%
Maximum month-end balance	$ 12,903,000	$ 16,715,000	$ 16,722,000
Weighted average interest rate (as a percent)	2.87%	3.16%	2.99%