v3.19.1

Investment in Loans (Schedule of Residential Mortgage Loans: Geographic Distribution) (Details) - Financing Receivables, Unpaid Principal Balance [Member] - Residential mortgage loans - Geographic Concentration Risk [Member] | 3 Months Ended
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Mar. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Percentage of Total Outstanding Unpaid Principal Balance | 100.00%
California [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Percentage of Total Outstanding Unpaid Principal Balance | 48.30%
Florida [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Percentage of Total Outstanding Unpaid Principal Balance | 12.90%
Texas [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Percentage of Total Outstanding Unpaid Principal Balance | 12.70%
Colorado [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Percentage of Total Outstanding Unpaid Principal Balance | 4.40%
Arizona [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Percentage of Total Outstanding Unpaid Principal Balance | 2.80%
Oregon [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Percentage of Total Outstanding Unpaid Principal Balance | 2.40%
Washington [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Percentage of Total Outstanding Unpaid Principal Balance | 2.20%
New York [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Percentage of Total Outstanding Unpaid Principal Balance | 2.20%
Nevada [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Percentage of Total Outstanding Unpaid Principal Balance | 2.10%
Utah [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Percentage of Total Outstanding Unpaid Principal Balance | 1.50%
New Jersey [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Percentage of Total Outstanding Unpaid Principal Balance | 1.30%
Maryland [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Percentage of Total Outstanding Unpaid Principal Balance | 1.10%
Other [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Percentage of Total Outstanding Unpaid Principal Balance | 6.10%

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