FEDERAL FUNDS PURCHASED (Details) (Federal funds purchased, USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Information on Federal funds purchased
Balance at end of year			$ 22,000
Average balance outstanding during the year	2,227,000	3,496,000	871,000
Maximum balance outstanding at any month-end	60,000,000	100,000,000	6,023,000
Weighted average interest rate during the year (as a percent)	0.09%	0.10%	0.20%
Weighted average interest rate at end of year (as a percent)			0.15%
Available borrowing capacity from Federal funds line facilities	$ 588,000,000	$ 563,000,000
Minimum
Information on Federal funds purchased
Maturity period	1 day
Maximum
Information on Federal funds purchased
Maturity period	6 months