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Distressed and Other Residential Mortgage Loans, Net - Narrative (Details) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) loan | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Allowance for loan losses | $ 3,630,000 | $ 3,759,000 | $ 4,081,000 | $ 4,191,000
Allowance for loan losses, basis points | 6.47% | 6.25% |  |
CDOs outstanding | $ 4,800,000 | $ 4,800,000 |  |
Residential Mortgage Loans Held in Securitization Trusts and Real Estate Owned Held in Residential Securitization |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of delinquent loans | loan | 18 | 19 |  |
Principal amount of delinquent loans | $ 10,500,000 | $ 10,900,000 |  |
Residential Mortgage Loans Held in Securitization Trusts and Real Estate Owned Held in Residential Securitization | Payment Deferral |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Principal amount of delinquent loans | $ 6,400,000 | $ 6,600,000 |  |
Delinquent loans under modified payment, percent | 60.00% | 61.00% |  |
Distressed residential mortgage loans | Residential Mortgage |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Loans pledged as collateral, carrying value | $ 114,800,000 | $ 128,100,000 |  |
Distressed residential mortgage loans | Residential Mortgage | Deutsche Bank AG, Cayman Islands Branch |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Loans pledged as collateral, carrying value | 114,800,000 | 128,100,000 |  |
Distressed residential mortgage loans held in securitization trusts, net |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Distressed residential mortgage loans held in securitization trusts, carrying amount | 0 | 88,100,000 |  |
Financial Asset Acquired with Credit Deterioration | Distressed residential mortgage loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Distressed residential mortgage loans held in securitization trusts, carrying amount | $ 209,300,000 | $ 228,500,000 |  |

X
- Definition Represents Company’s net investment in the residential securitization trusts, which is the maximum amount of the Company’s investment that is at risk to loss and represents the difference between (i) the carrying amount of the mortgage loans and real estate owned held in residential securitization trusts and (ii) the amount of Residential CDOs outstanding. + References No definition available. + Details
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- Definition Represents allowance for loan losses expressed as basis points of the outstanding principal balance of residential loans held in securitization trusts. + References No definition available. + Details
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- Definition Represents the percentage of delinquent loans that are currently under some form of modified payment plan. + References No definition available. + Details
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- Definition The aggregate number of delinquent loans. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of principal due on delinquent mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column H -Subsection 29 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Column H)) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and other-than-temporary impairments), for loans accounted for as debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5086-111524 + Details
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