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
Jun. 30, 2013
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 100.00%    
Assets Reported at Fair Value, Available-for-sale Securities 82.90%    
Assets Reported at Fair Value, Trading Securities 5.60%    
Mortgage Loans Held-for-sale Categorized as Level 2 Assets 54.30%    
Mortgage Loans Held-for-sale Categorized as Level 3 Assets 45.70%    
Mortgage Loans Held-for-investment Categorized as Level 2 Assets 100.00%    
Mortgage Servicing Rights Categorized as Level 3 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%    
Available-for-Sale Securities $ 14,892,315   $ 13,666,954
Trading Securities 1,001,172   1,002,062
Equity securities 0   335,638
Mortgage servicing rights 1,452 0 0
Fair Value, Measurements, Recurring [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-Sale Securities 14,892,315   13,666,954
Trading Securities 1,001,172   1,002,062
Equity securities     335,638
Mortgage loans held-for-sale 958,201   58,607
Mortgage loans held-for-investment in securitization trust 401,347    
Derivative assets 699,351   462,080
Mortgage servicing rights 1,452    
Assets, Fair Value Disclosure 17,953,838   15,525,341
Collateralized borrowings in securitization trust 363,012    
Derivative liabilities 46,028   129,294
Liabilities, Fair Value Disclosure 409,040   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 0   0
Trading Securities 1,001,172   1,002,062
Equity securities     335,638
Mortgage loans held-for-sale 0   0
Mortgage loans held-for-investment in securitization trust 0    
Derivative assets 61,156   1,917
Mortgage servicing rights 0    
Assets, Fair Value Disclosure 1,062,328   1,339,617
Collateralized borrowings in securitization trust 0    
Derivative liabilities 22,568   239
Liabilities, Fair Value Disclosure 22,568   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 14,892,315   13,665,083
Trading Securities 0   0
Equity securities     0
Mortgage loans held-for-sale 520,008   58,607
Mortgage loans held-for-investment in securitization trust 401,347    
Derivative assets 638,195   460,163
Mortgage servicing rights 0    
Assets, Fair Value Disclosure 16,451,865   14,183,853
Collateralized borrowings in securitization trust 363,012    
Derivative liabilities 23,460   129,055
Liabilities, Fair Value Disclosure 386,472   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 0   1,871
Trading Securities 0   0
Equity securities     0
Mortgage loans held-for-sale 438,193   0
Mortgage loans held-for-investment in securitization trust 0    
Derivative assets 0   0
Mortgage servicing rights 1,452    
Assets, Fair Value Disclosure 439,645   1,871
Collateralized borrowings in securitization trust 0    
Derivative liabilities 0   0
Liabilities, Fair Value Disclosure $ 0   $ 0