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Fair Value Measurements (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Fair Value Assets and Liabilities Measured on Recurring Basis [Line Items]      
Revised relative change ratio of CDS fee to cash market spread   73.20%  
Notional outstanding   $ 12,884,416 $ 14,166,612
Credit valuation adjustment included in fair value of credit derivative liabilities   393,276 572,523
CVA percentage   65.00% 75.00%
Fair Value Measurements (Textual) [Abstract]      
Credit valuation adjustment included in fair value of derivative liabilities other than credit derivatives   160,548 166,868
Percentage of CDS gross par outstanding used in the determination of CDS fair values   83.00%  
Percentage of CDS gross par outstanding using internally estimated reference obligation prices in determination of fair value 17.00%    
Percentage of CDS derivative liability used in the determination of CDS fair values   83.00%  
Percentage of CDS liability using internally estimated reference obligation prices in determination of fair value 17.00%    
Reference rate for the variable rate of the interest rate derivative liabilities   LIBOR  
Derivative liabilities   (211,617) (190,653)
Additional basis point fee need to receive for issuing a CDS on obligation   0.05%  
Additional basis points fee increase on change of reference obligation spread   0.15%  
Estimated remaining life   8 years  
Weighted average discount rates     36.57%
Weighted average discounted rate of estimated future premium payments to be paid by the VIEs   7.60% 8.40%
Percentage of profit margin   20.00%  
Minimum [Member]
     
Fair Value Assets and Liabilities Measured on Recurring Basis [Line Items]      
Basis point fee received for issuing a CDS on reference obligation base fee   0.20%  
Relative change ratio of CDS fee to cash market spread   25.00%  
Credit spread of reference obligation of a base transaction   0.80%  
Minimum [Member] | Internal Credit Rating [Member]
     
Fair Value Assets and Liabilities Measured on Recurring Basis [Line Items]      
Revised relative change ratio of CDS fee to cash market spread   33.00%  
Maximum [Member]
     
Fair Value Assets and Liabilities Measured on Recurring Basis [Line Items]      
Basis point fee received for issuing a CDS on reference obligation hypothetical fee   0.25%  
Hypothetical Relative change ratio of CDS fee to cash market spread   35.00%  
Credit spread of reference obligation of revised transaction   1.00%  
Maximum [Member] | Internal Credit Rating [Member]
     
Fair Value Assets and Liabilities Measured on Recurring Basis [Line Items]      
Full Relative change ratio of CDS fee to cash market spread   100.00%  
Other Contract [Member]
     
Fair Value Assets and Liabilities Measured on Recurring Basis [Line Items]      
Notional outstanding   1,616,683 1,838,269
Weighted average life (WAL) in years   8 years 4 months 24 days 9 years
Weighted average quotes   10.00% 11.00%
CVA percentage   65.00% 75.00%
Weighted average credit rating   A A+
Fair value of derivative liabilities   (55,040) (49,807)
Fixed Income Securities [Member]
     
Fair Value Assets and Liabilities Measured on Recurring Basis [Line Items]      
Percentage of investment portfolio valued using dealer quotes   7.00% 8.00%
Fixed Income Securities [Member] | Minimum [Member]
     
Fair Value Assets and Liabilities Measured on Recurring Basis [Line Items]      
Percentage of investment portfolio valued using internal valuation models   1.00% 1.00%
Fixed Income Securities [Member] | Maximum [Member]
     
Fair Value Assets and Liabilities Measured on Recurring Basis [Line Items]      
Percentage of investment portfolio valued using external pricing services   92.00% 91.00%
Fair Value, Level 3 [Member] | Corporate obligations [Member]
     
Fair Value Assets and Liabilities Measured on Recurring Basis [Line Items]      
Fair value of investments in corporate obligation securities classified as level 3 in the fair value hierarchy   3,466 7,930
Fair Value, Level 3 [Member] | Other asset-backed securities [Member]
     
Fair Value Assets and Liabilities Measured on Recurring Basis [Line Items]      
Fair value of investments in corporate obligation securities classified as level 3 in the fair value hierarchy   50,746 75,886
Fair Value, Level 3 [Member] | U.S. agency obligations [Member]
     
Fair Value Assets and Liabilities Measured on Recurring Basis [Line Items]      
Fair value of investments in corporate obligation securities classified as level 3 in the fair value hierarchy   0 1,224
Fair Value, Level 3 [Member] | Collateralized debt obligations [Member]
     
Fair Value Assets and Liabilities Measured on Recurring Basis [Line Items]      
Fair value of investments in corporate obligation securities classified as level 3 in the fair value hierarchy   9,558 12,482
Fair Value, Level 3 [Member] | European ABS transactions [Member]
     
Fair Value Assets and Liabilities Measured on Recurring Basis [Line Items]      
Fair value of investments in corporate obligation securities classified as level 3 in the fair value hierarchy   $ 2,346,060 $ 1,934,642