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Residential Whole Loans (Purchased Performing Loans) (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) loan | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) loan | Sep. 30, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Weighted Average LTV Ratio |  |  | 80.00% |
Purchased credit impaired loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Provisions for loan losses | $ 347,000 | $ 164,000 | $ 915,000 | $ 131,000
Purchased Performing Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of other loans at carrying value | loan | 166 |  | 166 |
Unpaid balance of other loans | $ 66,400,000 |  | $ 66,400,000 |
Total outstanding principal balance of all of the Company’s purchased performing loans | 1.60% |  | 1.60% |
Weighted Average LTV Ratio |  |  | 68.00% |
Allowance for loan loss | $ 388,000 |  | $ 388,000 |
Provisions for loan losses | 0 |  | 622,000 | $ 0
Rehabilitation loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Commitment to lend, unfunded | $ 126,000,000.0 |  | $ 126,000,000.0 |

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