Annual report pursuant to Section 13 and 15(d)

Schedule of Repurchase Agreements by Collateral Type (Details)

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Schedule of Repurchase Agreements by Collateral Type (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability $ 12,250,450 $ 12,624,510
Assets Sold under Agreements to Repurchase, Weighted Average Borrowing Rate, Excluding U.S. Treasuries and Interest Rate Swaps 0.75% 0.76%
Assets Sold under Agreements to Repurchase, Weighted Average Remaining Maturity, Excluding U.S. Treasuries and Interest Rate Swaps 72 85
Assets Sold under Agreements to Repurchase, Interest Rate 0.69% 0.72%
US Treasury Securities [Member]
    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 997,500 997,500
Assets Sold under Agreements to Repurchase, Interest Rate 0.03% 0.30%
US Government Agencies Debt Securities [Member]
    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 9,109,510 10,171,385
Assets Sold under Agreements to Repurchase, Interest Rate 0.46% 0.54%
Mortgage-backed Securities, Issued by Private Enterprises [Member]
    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 1,829,709 1,177,675
Assets Sold under Agreements to Repurchase, Interest Rate 2.01% 2.50%
Inverse Interest-Only Securities [Member]
    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 166,438 228,241
Assets Sold under Agreements to Repurchase, Interest Rate 1.05% 1.16%
Loans Held-for-sale, Mortgages [Member]
    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability $ 147,293 $ 49,709
Assets Sold under Agreements to Repurchase, Interest Rate 2.85% 2.46%