Quarterly report pursuant to Section 13 or 15(d)

Fair Value Fair Value, Measurement Inputs, Disclosure (Details)

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Fair Value Fair Value, Measurement Inputs, Disclosure (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading Securities Categorized as Level 1 Assets 100.00%  
Avaialble-for-sale Securities Categorized as Level 2 Assets 99.90%  
Assets Reported at Fair Value, Available-for-sale Securities 85.60%  
Assets Reported at Fair Value, Trading Securities 5.70%  
Equity Securities Categorized as Level 1 Assets 100.00%  
Mortgage Loans Held-for-sale Categorized as Level 2 Assets 36.00%  
Mortgage Loans Held-for-sale Categorized as Level 3 Assets 64.00%  
Mortgage Loans Held-for-investment Categorized as Level 2 Assets 100.00%  
Interest Rate Swaps, Swaptions and Credit Default Swaps Categorized as Level 2 Assets (Liabilities) 100.00%  
Inverse Interest-only Securities Categorized as Level 2 Assets 100.00%  
Agency To-be-Announced Securities Categoized as Level 1 Assets (Liabilities) 100.00%  
Forward Purchase Commitments Categorized as Level 3 Assets 100.00%  
Collateralized Borrowings in Securitization Trust Categorized as Level 2 Liabilities 100.00%  
Equity securities, at fair value $ 368,970 $ 335,638
Fair Value, Measurements, Recurring [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-Sale Securities, Fair Value Disclosure 14,963,531 13,666,954
Trading Securities, Fair Value Disclosure 1,002,414 1,002,062
Equity securities, at fair value 368,970 335,638
Mortgages Held-for-Sale, Fair Value Disclosure 192,417 58,607
Mortgage loans held-for-investment in securitization trust, Fair Value Disclosure 434,068  
Derivative Assets 511,749 462,080
Assets, Fair Value Disclosure 17,473,149 15,525,341
Collateralized borrowings in securitization trust, Fair Value Disclosure 397,229  
Derivative Financial Instruments, Liabilities, Fair Value Disclosure 45,423 129,294
Liabilities, Fair Value Disclosure 442,652 129,294
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-Sale Securities, Fair Value Disclosure 0 0
Trading Securities, Fair Value Disclosure 1,002,414 1,002,062
Equity securities, at fair value 368,970 335,638
Mortgages Held-for-Sale, Fair Value Disclosure 0 0
Mortgage loans held-for-investment in securitization trust, Fair Value Disclosure 0  
Derivative Assets 2,237 1,917
Assets, Fair Value Disclosure 1,373,621 1,339,617
Collateralized borrowings in securitization trust, Fair Value Disclosure 0  
Derivative Financial Instruments, Liabilities, Fair Value Disclosure 156 239
Liabilities, Fair Value Disclosure 156 239
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-Sale Securities, Fair Value Disclosure 14,959,031 13,665,083
Trading Securities, Fair Value Disclosure 0 0
Equity securities, at fair value 0 0
Mortgages Held-for-Sale, Fair Value Disclosure 69,182 58,607
Mortgage loans held-for-investment in securitization trust, Fair Value Disclosure 434,068  
Derivative Assets 509,512 460,163
Assets, Fair Value Disclosure 15,971,793 14,183,853
Collateralized borrowings in securitization trust, Fair Value Disclosure 397,229  
Derivative Financial Instruments, Liabilities, Fair Value Disclosure 45,267 129,055
Liabilities, Fair Value Disclosure 442,496 129,055
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-Sale Securities, Fair Value Disclosure 4,500 1,871
Trading Securities, Fair Value Disclosure 0 0
Equity securities, at fair value 0 0
Mortgages Held-for-Sale, Fair Value Disclosure 123,235 0
Mortgage loans held-for-investment in securitization trust, Fair Value Disclosure 0  
Derivative Assets 0 0
Assets, Fair Value Disclosure 127,735 1,871
Collateralized borrowings in securitization trust, Fair Value Disclosure 0  
Derivative Financial Instruments, Liabilities, Fair Value Disclosure 0 0
Liabilities, Fair Value Disclosure $ 0 $ 0