Annual report pursuant to Section 13 and 15(d)

Repurchase Agreements Outstanding Balances and Key Metrics (Details)

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Repurchase Agreements Outstanding Balances and Key Metrics (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements $ 5,008,274 $ 12,932,463
Assets Sold under Agreements to Repurchase, Weighted Average Borrowing Rate, Excluding U.S. Treasuries and Interest Rate Swaps 1.10% 0.72%
Assets Sold under Agreements to Repurchase, Weighted Average Remaining Maturity, Excluding U.S. Treasuries and Interest Rate Swaps 35 64
Assets Sold under Agreements to Repurchase, Interest Rate 1.10% 0.64%
US Treasury Securities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements   $ 1,996,250
Assets Sold under Agreements to Repurchase, Interest Rate   0.23%