Annual report pursuant to Section 13 and 15(d)

Derivative Instruments and Hedging Activities Commitments to Purchase Residential Mortgage Loans Held-for-Sale (Details)

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Derivative Instruments and Hedging Activities Commitments to Purchase Residential Mortgage Loans Held-for-Sale (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivative [Line Items]      
Derivative, Notional Amount $ 21,998,381 $ 48,115,523 $ 37,366,610
Loan Purchase Commitments [Member]      
Derivative [Line Items]      
Derivative, Notional Amount 286,120 554,838 $ 12,063
Derivative Financial Instruments, Assets [Member]      
Derivative [Line Items]      
Derivative, Notional Amount 21,735,997 36,315,523  
Derivative, Fair Value, Net 271,509 380,791  
Derivative Financial Instruments, Assets [Member] | Loan Purchase Commitments [Member]      
Derivative [Line Items]      
Derivative, Notional Amount 98,736    
Derivative, Fair Value, Net 77 1,297  
Derivative Financial Instruments, Liabilities [Member]      
Derivative [Line Items]      
Derivative, Notional Amount 1,362,384 16,200,000  
Derivative, Fair Value, Net (7,285) (90,233)  
Derivative Financial Instruments, Liabilities [Member] | Loan Purchase Commitments [Member]      
Derivative [Line Items]      
Derivative, Notional Amount 187,384 0  
Derivative, Fair Value, Net $ (427) $ 0