Quarterly report pursuant to Section 13 or 15(d)

Commercial Real Estate Loans Held-for-Investment (Details)

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Commercial Real Estate Loans Held-for-Investment (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Assets Sold under Agreements to Repurchase, Market Value $ 10,852,486 $ 14,599,240
Commercial Real Estate Loans Held-for-Investment, Unpaid Principal 45,900 0
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums, Commercial (295) 0
Mortgage Loans on Real Estate, Commercial and Consumer, Net 45,605 0
Loans Held-for-investment, Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Assets Sold under Agreements to Repurchase, Market Value $ 45,605 $ 0