FAIR VALUE MEASUREMENT (Details 6) (Nonrecurring, Level 3, USD $) In Millions, except Per Share data, unless otherwise specified									9 Months Ended					9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 Other real estate owned	Sep. 30, 2012 Other real estate owned Price-based Minimum	Sep. 30, 2012 Other real estate owned Price-based Maximum	Sep. 30, 2012 Loans held-for-sale	Sep. 30, 2012 Loans held-for-sale Price-based Minimum	Sep. 30, 2012 Loans held-for-sale Price-based Maximum	Sep. 30, 2012 Loans held-for-sale Cash flow Minimum	Sep. 30, 2012 Loans held-for-sale Cash flow Maximum	Sep. 30, 2012 Loans	Sep. 30, 2012 Loans Price-based Minimum	Sep. 30, 2012 Loans Price-based Maximum	Sep. 30, 2012 Loans Recovery Analysis Minimum	Sep. 30, 2012 Loans Recovery Analysis Maximum
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Fair value of assets as of the balance sheet date	$ 1,845	$ 1,885	$ 154			$ 1,216					$ 466
Price				$ 0.00	$ 18,604,507.00		$ 38.96	$ 100.00
Yield (as a percent)									15.00%	15.00%
Discount to price				$ 11.00	$ 40.00							$ 25.00	$ 34.00
Recovery Rate (as a percent)														0.00%	100.00%