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FAIR VALUE MEASUREMENT (Details 5) (Nonrecurring, Level 3, USD $)
12 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
Other real estate owned
Price-based
Dec. 31, 2012
Other real estate owned
Price-based
Jun. 30, 2013
Other real estate owned
Price-based
Minimum
Dec. 31, 2012
Other real estate owned
Price-based
Minimum
Jun. 30, 2013
Other real estate owned
Price-based
Maximum
Dec. 31, 2012
Other real estate owned
Price-based
Maximum
Jun. 30, 2013
Other real estate owned
Price-based
Weighted Average
Jun. 30, 2013
Loans held-for-sale
Price-based
Dec. 31, 2012
Loans held-for-sale
Price-based
Jun. 30, 2013
Loans held-for-sale
Price-based
Minimum
Dec. 31, 2012
Loans held-for-sale
Price-based
Minimum
Jun. 30, 2013
Loans held-for-sale
Price-based
Maximum
Dec. 31, 2012
Loans held-for-sale
Price-based
Maximum
Jun. 30, 2013
Loans held-for-sale
Price-based
Weighted Average
Dec. 31, 2012
Loans held-for-sale
Recovery analysis
Dec. 31, 2012
Loans held-for-sale
External model
Dec. 31, 2012
Loans held-for-sale
External model
Minimum
Dec. 31, 2012
Loans held-for-sale
External model
Maximum
Jun. 30, 2013
Loans
Price-based
Dec. 31, 2012
Loans
Price-based
Jun. 30, 2013
Loans
Price-based
Minimum
Dec. 31, 2012
Loans
Price-based
Minimum
Jun. 30, 2013
Loans
Price-based
Maximum
Dec. 31, 2012
Loans
Price-based
Maximum
Jun. 30, 2013
Loans
Price-based
Weighted Average
Jun. 30, 2013
Loans
Model-based
Jun. 30, 2013
Loans
Model-based
Minimum
Jun. 30, 2013
Loans
Model-based
Maximum
Jun. 30, 2013
Loans
Model-based
Weighted Average
Jun. 30, 2013
Loans
Recovery analysis
Jun. 30, 2013
Loans
Recovery analysis
Minimum
Jun. 30, 2013
Loans
Recovery analysis
Maximum
Jun. 30, 2013
Loans
Recovery analysis
Weighted Average
Dec. 31, 2012
Loans
Internal model
Dec. 31, 2012
Loans
Internal model
Minimum
Dec. 31, 2012
Loans
Internal model
Maximum
Fair Value Inputs Assets Liabilities Quantitative Information                                                                            
Fair value of assets as of the balance sheet date $ 1,638,000,000 $ 2,239,000,000 $ 136,000,000 $ 165,000,000           $ 800,000,000 $ 747,000,000           $ 174,000,000 $ 485,000,000     $ 381,000,000 $ 351,000,000           $ 131,000,000       $ 77,000,000       $ 111,000,000    
Price         54.63 39,774.00 100.00 15,457,452.00 98.05     35.00 63.42 100.00 100.00 93.00                                         6,272,242 86,200,000
Credit spread (as a percent)                                     0.40% 0.40%                                    
Discount to price (as a percent)         24.00% 11.00% 57.00% 50.00% 35.39%     11.00%   24.00%   20.00%               25.00%   34.00%     24.00% 34.00% 31.55%              
Appraised Value         $ 0.00   $ 5,000,000   $ 472,023                           $ 433,649   $ 133,074,154   $ 58,648,490                      
Discount rate                                                                         6.00% 16.49%
Recovery rate (as a percent)                                                                 45.00% 65.00% 53.80%