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Commercial Mortgage and Subordinate Loans, Net - Additional Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) $ / ft² | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) loan | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) $ / ft² | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of loan portfolio |  |  |  |  |  |  |  |  | 100.00% | 100.00% |
Provision for loan losses and impairment | $ 15,000 | $ 0 | $ 5,000 | $ 0 | $ 0 | $ 0 | $ 5,000 | $ 0 | $ 20,000 | $ 5,000 | $ 15,000
Carrying value | 4,927,593 |  |  |  | 3,679,758 |  |  |  | 4,927,593 | 3,679,758 |
Payment in kind interest |  |  |  |  |  |  |  |  | 43,500 | 25,200 | 24,400
Proceeds from pre-payment penalties or accelerated fees |  |  |  |  |  |  |  |  | 2,300 | 5,400 | 5,200
Commercial Mortgage and Subordinated Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loan loss provision and impairment |  |  |  |  |  |  |  |  | 37,000 | 17,000 |
Provision for loan losses and impairment |  |  |  |  |  |  |  |  | 20,000 |  |
Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses and impairment |  |  |  |  |  |  |  |  |  | 37,000 |
Carrying value | 3,878,981 |  |  |  | 2,653,826 |  |  |  | 3,878,981 | 2,653,826 |
Subordinate Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses and impairment |  |  |  |  |  |  |  |  |  | 17,000 |
Carrying value | 1,048,612 |  |  |  | $ 1,025,932 |  |  |  | 1,048,612 | 1,025,932 |
Retail Center - Cincinnati, OH [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses and impairment | 15,000 |  |  |  |  |  |  |  | 15,000 |  |
Residential Condominium - Bethesda, MD [Member] | Commercial Mortgage and Subordinated Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loan loss provision and impairment |  |  |  |  |  |  |  |  | 10,000 |  |
Provision for loan losses and impairment |  |  | $ 5,000 |  |  |  | 2,000 |  |  | 2,000 |
Residential Condominium - Bethesda, MD [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses and impairment |  |  |  |  |  |  |  |  | 5,000 |  |
Multifamily - Williston, ND [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses and impairment |  |  |  |  |  |  |  |  |  |  | 10,000
Multifamily - Williston, ND [Member] | Subordinate Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses and impairment |  |  |  |  |  |  |  |  |  |  | $ 5,000
Office Campus - Renton, WA [Member] | Subordinate Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of loan |  |  |  |  |  |  |  |  | 75,000 |  |
Proceeds from sale of loan, amount funded |  |  |  |  |  |  |  |  | 17,700 |  |
Carrying value | 265,000 |  |  |  |  |  |  |  | 265,000 |  |
Exposure to mortgage loan | 190,000 |  |  |  |  |  |  |  | 190,000 |  |
Exposure to mortgage loan, amount funded | 82,000 |  |  |  |  |  |  |  | 82,000 |  |
Other Assets [Member] | Commercial Mortgage and Subordinated Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment |  |  |  |  |  |  | $ 3,000 |  | $ 3,000 |  |
Other Assets [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment |  |  |  |  |  |  |  |  |  | $ 3,000 |
Floating Rate Loan [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of loan portfolio |  |  |  |  |  |  |  |  | 91.00% | 88.00% |
Net operating income [Member] | Retail Center - Cincinnati, OH [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loan Collateral | $ 10,500 |  |  |  |  |  |  |  | $ 10,500 |  |
Capitalization rate [Member] | Retail Center - Cincinnati, OH [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loan collateral, measurement input |  |  | 0.0675 |  |  |  |  |  |  |  |
Discount rate [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loan collateral, measurement input |  |  |  |  |  |  |  |  |  |  | 0.10
Discount rate [Member] | Residential Condominium - Bethesda, MD [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loan collateral, measurement input | 0.15 |  |  |  |  |  |  |  | 0.15 |  |
Terminal capitalization rate [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loan collateral, measurement input |  |  |  |  |  |  |  |  |  |  | 0.11
Dollars per square foot [Member] | Residential Condominium - Bethesda, MD [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loan collateral, measurement input | $ / ft² | 662 |  |  |  |  |  |  |  | 662 |  |
Contractual Interest Rate Reduction [Member] | Retail Center - Cincinnati, OH [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of loans restructured | loan |  |  | 1 |  |  |  |  |  |  |  |
Unpaid principal balance of loan restructured |  |  | $ 169,000 |  |  |  |  |  |  |  |
Contractual Interest Rate Reduction [Member] | London Interbank Offered Rate (LIBOR) [Member] | Retail Center - Cincinnati, OH [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 3.00% | 5.50% |  |  |  |  |  |  |

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