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CORPORATE LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 3) (USD $)
3 Months Ended
Mar. 31, 2013
item
Issuer
Mar. 31, 2012
Dec. 31, 2012
Issuer
Dec. 31, 2011
Recorded investment in impaired loans and related allowances for credit losses        
Number of issuers of loans related to the aggregate allowance on impaired loans 4   6  
Impaired Financing Receivable, Recorded Investment        
Recorded Investment, with no related allowance recorded     $ 6,490,000  
Recorded Investment, with an allowance recorded 522,121,000   438,947,000  
Recorded Investment 522,121,000   445,437,000  
Unpaid Principal Balance, with no related allowance recorded     19,931,000  
Unpaid Principal Balance, with an allowance recorded 551,785,000   464,214,000  
Unpaid Principal Balance 551,785,000   484,145,000  
Related Allowance 86,944,000   94,863,000  
Average Recorded Investment, with no related allowance recorded 3,245,000      
Average Recorded Investment, with an allowance recorded 480,534,000 68,860,000    
Average Recorded Investment 483,779,000 68,860,000    
Interest Income Recognized, with an allowance recorded 4,274,000 803,000    
Interest Income Recognized 4,274,000 803,000    
Number of classifications of impaired loans on non-accrual status 3      
Recorded investment with nonaccrual status 638,330,000   536,277,000  
Interest income recognized using cash basis method 8,000,000 4,400,000    
Impaired Financing Receivable, Amortized Cost        
Allowances for loan losses 206,227,000 235,807,000 223,472,000 191,407,000
Texas Competitive Electric Holdings Company LLC
       
Impaired Financing Receivable, Amortized Cost        
Impaired loans 311,400,000      
Allowances for loan losses 54,500,000      
Corporate Loan Held for Investment
       
Impaired Financing Receivable, Recorded Investment        
Recorded investment with nonaccrual status 561,550,000   445,437,000  
Impaired portion of recorded investment with nonaccrual status 522,100,000      
Interest income recognized using cash basis method 4,300,000 800,000    
Impaired Financing Receivable, Amortized Cost        
Impaired loans 5,914,332,000   6,029,059,000  
Allowances for loan losses 206,227,000 235,807,000 223,472,000 191,407,000
Corporate Loans Held for Sale
       
Impaired Financing Receivable, Recorded Investment        
Recorded investment with nonaccrual status 75,608,000   90,840,000  
Interest income recognized using cash basis method 3,700,000 3,600,000    
Corporate Loans, at Estimated Fair Value
       
Impaired Financing Receivable, Recorded Investment        
Recorded investment with nonaccrual status $ 1,172,000