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Mortgage Loans Held for Investment, Net and Related Non-Recourse Collateralized Financing (Notes) | 12 Months Ended
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Dec. 31, 2017
Mortgage Loans Held for Investment, Net [Abstract] |
Transfers and Servicing of Financial Assets [Text Block] | MORTGAGE LOANS HELD FOR INVESTMENT, NET AND RELATED NON-RECOURSE COLLATERALIZED FINANCING The Company's mortgage loans held for investment, net are single-family mortgage loans which were originated or purchased by the Company from 1992 through 1998. These loans have an amortized cost of $15,885 as of December 31, 2017 compared to $19,317 as of December 31, 2016. The unpaid principal balance of the Company's single-family mortgage loans identified as seriously delinquent as of December 31, 2017 was $1,307 compared to $1,094 as of December 31, 2016. The Company continues to accrue interest on its seriously delinquent securitized single-family mortgage loans because the primary servicer continues to advance the interest and/or principal due on the loan. An allowance has been established for currently existing and probable losses on the Company's mortgage loans held for investment, which was $147 as of December 31, 2017 compared to $281 as of December 31, 2016. The Company's single-family mortgage loans are considered homogeneous and are evaluated on a pool basis for a general allowance. The Company considers various factors in determining its general allowance requirement, including whether a loan is delinquent, the Company’s historical experience with similar types of loans, historical cure rates of delinquent loans, and historical and anticipated loss severity of the mortgage loans as they are liquidated. The allowance for loan losses is evaluated and adjusted periodically by management based on the actual and estimated timing and amount of probable credit losses, using the above factors, as well as industry loss experience. The Company recorded $80, $130, and $180 as provision for loan losses for the years ended December 31, 2017, 2016, and 2015, respectively, which is included within "other income, net" on the Company's consolidated statements of comprehensive income (loss). The majority of the Company's mortgage loans held for investment, net is pledged as collateral for the one remaining class of the Company's single-family securitization financing bond, which is recorded on the Company's balance sheet as "non-recourse collateralized financing". The interest rate on this bond is based on 1-month LIBOR plus 0.30% and is expected to mature by January 31, 2025 based on scheduled principal payments projected as of December 31, 2017. As of December 31, 2017, $6,233 of the principal balance of the single-family mortgage loans held for investment was pledged as collateral for the Company's non-recourse collateralized financing which had a remaining principal balance of $5,596. As of December 31, 2016, $7,200 of the principal balance of the Company's mortgage loans held for investment was pledged as collateral for the remaining principal balance of the outstanding bonds of $6,533.

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- Definition Mortgage Loans Held for Investment, Net [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for a transferor's continuing involvement in financial assets that it has transferred in a securitization or asset-backed financing arrangement, the nature of any restrictions on assets reported by an entity in its statement of financial position that relate to a transferred financial asset (including the carrying amounts of such assets), how servicing assets and servicing liabilities are reported, and (for securitization or asset-backed financing arrangements accounted for as sales) when a transferor has continuing involvement with the transferred financial assets and transfers of financial assets accounted for as secured borrowings, how the transfer of financial assets affects an entity's financial position, financial performance, and cash flows. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -URI http://asc.fasb.org/topic&trid=2197590 + Details
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