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Contractual Maturity Information Regarding Repurchase Agreements (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Assets Sold Under Agreements To Repurchase [Line Items]    
Repurchase agreements, Carrying Value $ 13,443,883 $ 15,759,831
Weighted Average Contractual Rate 0.65% 0.36%
Within 30 days    
Assets Sold Under Agreements To Repurchase [Line Items]    
Repurchase agreements, Carrying Value $ 12,693,883 $ 13,770,099
Weighted Average Contractual Rate 0.64% 0.35%
30 days to 3 months    
Assets Sold Under Agreements To Repurchase [Line Items]    
Repurchase agreements, Carrying Value   $ 1,489,732
Weighted Average Contractual Rate 0.00% 0.36%
3 months to 36 months    
Assets Sold Under Agreements To Repurchase [Line Items]    
Repurchase agreements, Carrying Value $ 750,000 $ 500,000
Weighted Average Contractual Rate 0.75% 0.53%