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Commercial Mortgage, Subordinate Loans and Other Lending Assets, Net - Additional Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) $ / ft² | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) $ / ft² | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) loan | Mar. 31, 2018 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2019 USD ($) $ / ft² | Dec. 31, 2018 USD ($) $ / ft² | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | May 31, 2018 USD ($) | Sep. 30, 2017 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of loan portfolio |  |  |  |  |  |  |  |  |  | 100.00% | 100.00% |  |  |  |
Provision for loan losses and impairment, net of reversals | $ 0 | $ 35,000 | $ (15,000) | $ 0 | $ 15,000 | $ 0 | $ 5,000 | $ 0 |  | $ 20,000 | $ 20,000 | $ 5,000 |  |  |
Payment in kind interest |  |  |  |  |  |  |  |  |  | 54,600 | 43,500 | 25,200 |  |  |
Proceeds received from PIK |  |  |  |  |  |  |  |  |  | 16,469 | 75,652 | 0 |  |  |
Loan loss provision and impairment |  |  |  |  |  |  |  |  |  | 35,000 | (20,000) |  |  |  |
Realized loss on investment, net of provision for loan loss reversal |  |  |  |  |  |  |  |  |  | 2,487 | 0 |  |  |  |
Carrying value | 6,375,093 |  |  |  | 4,927,593 |  |  |  |  | 6,375,093 | 4,927,593 |  |  |  |
Proceeds from pre-payment penalties or accelerated fees |  |  |  |  |  |  |  |  |  | 6,100 | 2,300 | $ 5,400 |  |  |
Realized (loss) gain on sale of securities |  |  |  |  |  |  |  |  |  |  | (5,500) |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses and impairment, net of reversals |  |  |  |  |  |  |  |  |  | 35,000 |  |  |  |  |
Loans and leases receivable, net amount | 6,375,093 |  |  |  | 4,927,593 |  |  |  |  | 6,375,093 | 4,927,593 |  |  |  |
Loan loss provision and impairment |  |  |  |  |  |  |  |  |  | 57,000 | 37,000 |  |  |  |
Realized loss on investment, net of provision for loan loss reversal |  |  | 12,500 |  |  |  |  |  |  | (12,513) |  |  |  |  |
Financing receivable, credit loss, expense (reversal) |  |  | $ 15,000 |  |  |  |  |  |  | 15,000 |  |  |  |  |
Commercial Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value | 5,326,967 |  |  |  | 3,878,981 |  |  |  |  | 5,326,967 | 3,878,981 |  |  |  |
Subordinate Mortgage and Other Lending Assets Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value | 1,048,126 |  |  |  | 1,048,612 |  |  |  |  | 1,048,126 | 1,048,612 |  |  |  |
Guarantor obligations, maximum exposure, undiscounted | 68,300 |  |  |  |  |  |  |  |  | $ 68,300 |  |  |  |  |
Guarantor obligations, maximum exposure, term |  |  |  |  |  |  |  |  |  | 6 years 9 months 21 days |  |  |  |  |
Retail Center - Cincinnati, OH | Commercial Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses and impairment, net of reversals |  | 32,000 |  |  | 15,000 |  |  |  |  | $ 47,000 |  |  |  |  |
Loans and leases receivable, net amount | 124,600 |  |  |  | 156,100 |  |  |  |  | 124,600 | 156,100 |  |  |  |
Payment in kind interest |  |  |  |  |  |  |  |  |  | 1,400 |  |  |  |  |
Loan loss provision and impairment |  |  |  |  |  |  |  |  |  | 32,000 | 15,000 |  |  |  |
Residential Condominium - Bethesda, MD | Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses and impairment, net of reversals |  | $ 3,000 |  |  |  |  | $ 5,000 |  | $ 2,000 |  |  |  |  |  |
Loans and leases receivable, net amount | 11,700 |  |  |  | 27,200 |  |  |  |  | 11,700 | 27,200 |  |  |  |
Loan loss provision and impairment |  |  |  |  |  |  |  |  |  | 13,000 |  |  |  |  |
Impairment |  |  |  |  |  |  |  |  | 3,000 |  |  |  |  |  |
Residential Condominium - Bethesda, MD | Commercial Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan loss provision and impairment |  |  |  |  |  |  |  |  |  | 3,000 | 5,000 |  |  |  |
Multifamily - Williston, ND | Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans and leases receivable, net amount |  |  |  |  | 32,400 |  |  |  |  |  | 32,400 |  |  |  |
Multifamily - Williston, ND | Commercial Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses and impairment, net of reversals |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000 |  |
Multifamily - Williston, ND | Subordinate Mortgage and Other Lending Assets Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses and impairment, net of reversals |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000 |  |
Retail, New York, NY | Subordinate Mortgage and Other Lending Assets Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value | 470,800 |  |  |  |  |  |  |  |  | 470,800 |  |  |  |  |
Exposure to mortgage loan | 318,100 |  |  |  |  |  |  |  |  | 318,100 |  |  |  |  |
Office Campus - Renton, WA | Subordinate Mortgage and Other Lending Assets Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value |  |  |  |  | $ 265,000 |  |  |  |  |  | 265,000 |  |  |  |
Proceeds from sale of loan |  |  |  |  |  |  |  |  |  |  | 75,000 |  |  |  |
Exposure to mortgage loan | 190,000 |  |  |  |  |  |  |  |  | 190,000 |  |  |  |  |
Proceeds from sale of loan, amount funded |  |  |  |  |  |  |  |  |  |  | $ 17,700 |  |  |  |
Exposure to mortgage loan, amount funded | $ 128,000 |  |  |  |  |  |  |  |  | $ 128,000 |  |  |  |  |
Capitalization rate | Retail Center - Cincinnati, OH | Commercial Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan collateral, measurement input | 0.0775 |  |  |  | 0.0675 |  |  |  |  | 0.0775 | 0.0675 |  |  |  |
Dollars per square foot | Residential Condominium - Bethesda, MD | Commercial Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan collateral, measurement input | $ / ft² | 573 |  |  |  | 662 |  |  |  |  | 573 | 662 |  |  |  |
Discount rate | Commercial Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan collateral, measurement input |  |  |  |  |  |  |  |  |  |  |  |  | 0.10 |  |
Discount rate | Residential Condominium - Bethesda, MD | Commercial Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan collateral, measurement input | 0.10 |  |  |  | 0.15 |  |  |  |  | 0.10 | 0.15 |  |  |  |
Terminal capitalization rate | Commercial Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan collateral, measurement input |  |  |  |  |  |  |  |  |  |  |  |  | 0.11 |  |
Contractual Interest Rate Reduction | Retail Center - Cincinnati, OH | Commercial Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of loans restructured | loan |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |
Unpaid principal balance of loan restructured |  |  |  |  |  |  | $ 171,200 |  |  |  |  |  |  |  |
Contractual Interest Rate Reduction | London Interbank Offered Rate (LIBOR) | Retail Center - Cincinnati, OH | Commercial Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  | 3.00% | 5.50% |  |  |  |  |  |  |
Other Assets | Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment |  |  |  |  |  |  |  |  |  | $ 3,000 |  |  |  |  |
Floating Rate Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of loan portfolio |  |  |  |  |  |  |  |  |  | 95.00% | 91.00% |  |  |  |
Mortgage loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Original face amount of mortgage | $ 6,467,842 |  |  |  | $ 4,982,514 |  |  |  |  | $ 6,467,842 | $ 4,982,514 |  |  |  |
Affiliated Entity | Commercial Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value |  |  |  |  |  |  |  |  | $ 100,000 |  |  |  |  | $ 300,000 | $ 125,000
Miami, Florida | Mortgage loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Original face amount of mortgage | 180,000 |  |  |  |  |  |  |  |  | 180,000 |  |  |  |  |
Mortgage loan in nonaccrual status | $ 182,900 |  |  |  | $ 222,000 |  |  |  |  | $ 182,900 | $ 222,000 |  |  |  |

X
- Definition Cash Flows Between Transferor and Transferee, Proceeds from New Transfers, Amount Funded + References No definition available. + Details
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- Definition Mortgage Loans on Real Estate, Commercial and Consumer, Percentage of Portfolio + References No definition available. + Details
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- Definition Qualitative and Quantitative Information, Transferor's Continuing Involvement, Arrangements of Financial Support, Amount Funded + References No definition available. + Details
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- Definition Cash Flows between a transferor and a transferee attributable to newly transferred assets related to either a securitization, asset-backed financing arrangement, or similar transfer in which the transferor has continuing involvement with the transferred financial assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in the transferred financial assets). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=118948506&loc=d3e107207-111719 + 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 Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524 + Details
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- Definition Amount of financing receivable modified as troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118939409&loc=d3e18845-111554 + Details
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- Definition Amount of financing receivable on nonaccrual status. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5111-111524 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919258-210447 + Details
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- Definition Net gain (loss) resulting from the sales of securitized, pay-through debt securities collateralized by real estate mortgage loans (mortgages). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 + Details
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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=118943654&loc=d3e12069-110248 + Details
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- Definition Reflects the net positive or negative amount derived from subtracting from net proceeds of sale and the carrying amounts, net of allocated reserves, of financial assets transferred to third parties in transactions that qualify for sales treatment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118948506&loc=d3e107425-111719 + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The percentage points (also referred to as 'margin') added to the reference rate as stated in the loan agreement and used to compute the variable rate on the loans receivable. For instance, the loan agreement might state that the interest rate the borrower is obligated to pay is the London Interbank Offered Rate (LIBOR) plus three quarters (3/4) of a percentage point adjusted quarterly (each three months). LIBOR in this example is the index or reference rate, 3/4 percentage point is the margin, the reference rate plus the margin is the fully indexed rate. This element would be used to report separately the margin. + References No definition available. + Details
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- Definition The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(c)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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- Definition Amount, before allowance for credit loss, of financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447 + Details
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