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DEBT OBLIGATIONS, NET - Additional Information (Details) |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |
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Feb. 26, 2019 Extension | Feb. 06, 2019 USD ($) | Jul. 20, 2018 | Apr. 03, 2018 USD ($) | Jan. 04, 2018 | Dec. 06, 2017 USD ($) | Mar. 31, 2019 USD ($) counterparty agreement Extension | Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Sep. 30, 2018 agreement | Dec. 31, 2018 USD ($) Extension | Jan. 01, 2021 USD ($) | Apr. 01, 2020 USD ($) | Dec. 27, 2018 USD ($) | May 07, 2018 USD ($) | Dec. 21, 2017 USD ($) | Oct. 17, 2017 USD ($) | Feb. 19, 2016
Committed Loan and Securities Repurchase Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts of recognized liabilities |  |  |  |  |  |  | $ 1,030,082,000 |  |  |  | $ 663,686,000 |  |  |  |  |  |  |
Mortgage loan receivables held for investment, net, at amortized cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of premiums |  |  |  |  |  |  | 386,000 | $ 253,000 |  |  |  |  |  |  |  |  |  |
Mortgage loan and financing related to property sales |  | $ 6,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment/defeasance of debt |  | $ (1,100,000) |  |  |  |  | (1,070,000) | (69,000) |  |  |  |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts offset in the balance sheet |  |  |  |  |  |  | 0 |  |  |  | 0 |  |  |  |  |  |  |
Proceeds from borrowings under debt obligations |  |  |  |  |  |  | $ 4,042,942,000 | 1,312,451,000 |  |  |  |  |  |  |  |  |  |
Borrowings from Federal Home Loan Bank (FHLB) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of FHLB advances to total debt obligations outstanding |  |  |  |  |  |  | 27.30% |  |  |  |  |  |  |  |  |  |  |
Retained earnings, appropriated |  |  |  |  |  |  | $ 849,000,000 |  |  |  |  |  |  |  |  |  |  |
Sales proceeds from non-recourse debt |  |  |  |  |  |  | 15,800,000 |  |  |  |  |  |  |  |  |  |  |
Tuebor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings from Federal Home Loan Bank (FHLB) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount restricted from transfer |  |  |  |  |  |  | 1,800,000,000 |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed Loan and Securities Repurchase Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed amount on credit agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000 |  |  |
Debt borrowings term |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility | One-Month LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed Loan and Securities Repurchase Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed amount on credit agreement |  |  |  |  |  |  | $ 266,430,000 |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of extension maturity periods | Extension | 2 |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |
Length of extension options | 12 months |  |  |  |  |  | 12 months |  |  |  |  |  |  |  |  |  |  |
Mortgage loan receivables held for investment, net, at amortized cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate on debt instrument (as a percent) |  |  |  |  |  |  | 3.25% |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed Loan and Securities Repurchase Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed amount on credit agreement |  |  |  | $ 350,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed Loan and Securities Repurchase Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed amount on credit agreement |  |  |  | $ 450,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed Loan and Securities Repurchase Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed amount on credit agreement |  |  |  |  |  |  | $ 25,000,000 |  |  |  |  |  |  |  |  |  |  |
Committed Loan Repurchase Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed Loan and Securities Repurchase Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed amount on credit agreement |  |  |  |  |  |  | 1,750,000,000 |  |  |  |  |  |  |  |  |  |  |
Committed financing |  |  |  |  |  |  | 1,750,000,000 |  |  |  | 1,750,000,000 |  |  | $ 100,000,000 |  |  |  |
Length of additional extension maturity periods |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts of recognized liabilities |  |  |  |  |  |  | $ 611,406,000 |  |  |  | 497,531,000 |  |  |  |  |  |  |
Mortgage loan receivables held for investment, net, at amortized cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of agreements | agreement |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts offset in the balance sheet |  |  |  |  |  |  | $ 902,725,000 |  |  |  | 744,310,000 |  |  |  |  |  |  |
Term master repurchase agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed Loan and Securities Repurchase Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed financing |  |  |  |  |  |  | 400,000,000 |  |  |  |  |  |  |  |  |  |  |
Total Repurchase Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed Loan and Securities Repurchase Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed financing |  |  |  |  |  |  | $ 2,150,000,000 |  |  |  | 2,150,000,000 |  |  |  |  |  |  |
Repurchase agreements, number of counterparties | counterparty |  |  |  |  |  |  | 8 |  |  |  |  |  |  |  |  |  |  |
Gross amounts of recognized liabilities |  |  |  |  |  |  | $ 1,030,082,000 |  |  |  | 663,685,000 |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts offset in the balance sheet |  |  |  |  |  |  | $ 1,383,995,000 |  |  |  | 932,113,000 |  |  |  |  |  |  |
Total Repurchase Facilities | Deutshe Bank, J.P. Morgan and Wells Fargo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed Loan and Securities Repurchase Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase agreements, number of counterparties | counterparty |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |
Excess collateral over amounts borrowed under repurchase agreements |  |  |  |  |  |  | $ 82,200,000 |  |  |  |  |  |  |  |  |  |  |
Ratio indebtedness over total equity (as a percent) |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |
Haircut on repurchase agreements (as a percent) |  |  |  |  |  |  | 25.80% |  |  |  |  |  |  |  |  |  |  |
Uncommitted securities Repurchase Facilities | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advance rates (as a percent) |  |  |  |  |  |  | 75.00% |  |  |  |  |  |  |  |  |  |  |
Uncommitted securities Repurchase Facilities | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advance rates (as a percent) |  |  |  |  |  |  | 95.00% |  |  |  |  |  |  |  |  |  |  |
Participation Financing - Mortgage Loan Receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed Loan and Securities Repurchase Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts of recognized liabilities |  |  |  |  |  |  | $ 2,400,000 |  |  |  | 2,500,000 |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from borrowings under debt obligations |  |  |  |  |  |  |  |  | $ 4,000,000 |  |  |  |  |  |  |  |  |
Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  |  |  |  |  |  | 10,509,000 |  |  |  |  |  |  |  |  |  |  |
2/24/2022 | Committed Loan Repurchase Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed Loan and Securities Repurchase Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed financing |  |  |  |  |  |  | 600,000,000 |  |  |  |  |  |  |  |  |  |  |
Gross amounts of recognized liabilities |  |  |  |  |  |  | $ 200,501,000 |  |  |  |  |  |  |  |  |  |  |
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of extension maturity periods | Extension |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |
Length of extension options |  |  |  |  |  |  | 12 months |  |  |  |  |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts offset in the balance sheet |  |  |  |  |  |  | $ 278,295,000 |  |  |  |  |  |  |  |  |  |  |
2/24/2022 | Committed Loan Repurchase Facility | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 4.23% |  |  |  |  |  |  |  |  |  |  |
2/24/2022 | Committed Loan Repurchase Facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 4.73% |  |  |  |  |  |  |  |  |  |  |
10/1/2020 | Committed Loan Repurchase Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed Loan and Securities Repurchase Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed financing |  |  |  |  |  |  |  |  |  |  | 600,000,000 |  |  |  |  |  |  |
Gross amounts of recognized liabilities |  |  |  |  |  |  |  |  |  |  | $ 180,597,000 |  |  |  |  |  |  |
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of extension maturity periods | Extension |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |
Length of extension options |  |  |  |  |  |  |  |  |  |  | 12 months |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts offset in the balance sheet |  |  |  |  |  |  |  |  |  |  | $ 262,642,000 |  |  |  |  |  |  |
10/1/2020 | Committed Loan Repurchase Facility | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  | 4.21% |  |  |  |  |  |  |
10/1/2020 | Committed Loan Repurchase Facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  | 4.96% |  |  |  |  |  |  |
Various Date | Uncommitted securities Repurchase Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed Loan and Securities Repurchase Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts of recognized liabilities |  |  |  |  |  |  | $ 324,827,000 |  |  |  | $ 166,154,000 |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts offset in the balance sheet |  |  |  |  |  |  | $ 368,046,000 |  |  |  | $ 187,803,000 |  |  |  |  |  |  |
Various Date | Uncommitted securities Repurchase Facilities | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 3.08% |  |  |  | 2.99% |  |  |  |  |  |  |
Various Date | Uncommitted securities Repurchase Facilities | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 4.23% |  |  |  | 4.55% |  |  |  |  |  |  |
Various Date | Mortgage loan financing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed Loan and Securities Repurchase Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed financing |  |  |  |  |  |  | $ 739,500,000 |  |  |  | $ 743,902,000 |  |  |  |  |  |  |
Gross amounts of recognized liabilities |  |  |  |  |  |  | 739,500,000 |  |  |  | 743,902,000 |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts offset in the balance sheet |  |  |  |  |  |  | $ 931,275,000 |  |  |  | $ 939,362,000 |  |  |  |  |  |  |
Various Date | Mortgage loan financing | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 4.25% |  |  |  | 4.25% |  |  |  |  |  |  |
Various Date | Mortgage loan financing | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 7.00% |  |  |  | 7.00% |  |  |  |  |  |  |
Various Date | CLO Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed Loan and Securities Repurchase Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed financing |  |  |  |  |  |  | $ 497,334,000 |  |  |  | $ 601,543,000 |  |  |  |  |  |  |
Gross amounts of recognized liabilities |  |  |  |  |  |  | 497,334,000 |  |  |  | 601,543,000 |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  |  |  |  |  |  | 1,900,000 |  |  |  | 2,600,000 |  |  |  |  |  |  |
Gross amounts offset in the balance sheet |  |  |  |  |  |  | $ 680,031,000 |  |  |  | $ 710,502,000 |  |  |  |  | $ 431,500,000 | $ 456,900,000 |
Various Date | CLO Debt | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 3.36% |  |  |  | 3.34% |  |  |  |  |  |  |
Various Date | CLO Debt | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 6.08% |  |  |  | 6.06% |  |  |  |  |  |  |
Various Date | CLO Debt | Weighted Average |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 4.65% |  |  |  |  |  |  |  |  |  |  |
Various Date | Borrowings from the FHLB |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed Loan and Securities Repurchase Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed financing |  |  |  |  |  |  | $ 1,945,795,000 |  |  |  | $ 1,933,522,000 |  |  |  |  |  |  |
Gross amounts of recognized liabilities |  |  |  |  |  |  | 1,291,449,000 |  |  |  | 1,286,000,000 |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts offset in the balance sheet |  |  |  |  |  |  | $ 1,608,381,000 |  |  |  | $ 1,652,952,000 |  |  |  |  |  |  |
Various Date | Borrowings from the FHLB | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 1.47% |  |  |  | 1.18% |  |  |  |  |  |  |
Various Date | Borrowings from the FHLB | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 3.08% |  |  |  | 3.01% |  |  |  |  |  |  |
Various Date | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  |  |  |  |  |  | $ 10,500,000 |  |  |  | $ 11,200,000 |  |  |  |  |  |  |
Borrowings from Federal Home Loan Bank (FHLB) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan refinance |  |  |  |  |  |  | $ 1,166,201,000 |  |  |  | $ 1,166,201,000 |  |  |  |  |  |  |
Various Date | Senior Unsecured Notes | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loan receivables held for investment, net, at amortized cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate on debt instrument (as a percent) |  |  |  |  |  |  | 5.25% |  |  |  | 5.25% |  |  |  |  |  |  |
Various Date | Senior Unsecured Notes | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loan receivables held for investment, net, at amortized cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate on debt instrument (as a percent) |  |  |  |  |  |  | 5.875% |  |  |  | 5.875% |  |  |  |  |  |  |
4/7/2019 | Committed Loan Repurchase Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed Loan and Securities Repurchase Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed financing |  |  |  |  |  |  |  |  |  |  | $ 300,000,000 |  |  |  |  |  |  |
Gross amounts of recognized liabilities |  |  |  |  |  |  |  |  |  |  | $ 120,631,000 |  |  |  |  |  |  |
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of extension maturity periods | Extension |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |
Length of extension options |  |  |  |  |  |  |  |  |  |  | 364 days |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts offset in the balance sheet |  |  |  |  |  |  |  |  |  |  | $ 204,747,000 |  |  |  |  |  |  |
4/7/2019 | Committed Loan Repurchase Facility | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  | 4.46% |  |  |  |  |  |  |
4/7/2019 | Committed Loan Repurchase Facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  | 4.96% |  |  |  |  |  |  |
5/6/2021 | Committed Loan Repurchase Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed Loan and Securities Repurchase Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed financing |  |  |  |  |  |  | $ 300,000,000 |  |  |  | $ 300,000,000 |  |  |  |  |  |  |
Length of additional extension maturity periods |  |  |  |  |  |  | 6 months |  |  |  | 6 months |  |  |  |  |  |  |
Gross amounts of recognized liabilities |  |  |  |  |  |  | $ 117,275,000 |  |  |  | $ 79,886,000 |  |  |  |  |  |  |
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of extension maturity periods | Extension |  |  |  |  |  |  | 1 |  |  |  | 1 |  |  |  |  |  |  |
Length of extension options |  |  |  |  |  |  | 12 months |  |  |  | 12 months |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts offset in the balance sheet |  |  |  |  |  |  | $ 173,142,000 |  |  |  | $ 117,382,000 |  |  |  |  |  |  |
5/6/2021 | Committed Loan Repurchase Facility | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 4.50% |  |  |  | 4.44% |  |  |  |  |  |  |
5/6/2021 | Committed Loan Repurchase Facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 5.00% |  |  |  | 4.94% |  |  |  |  |  |  |
7/20/2021 | Committed Loan Repurchase Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed Loan and Securities Repurchase Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed financing |  |  |  |  |  |  | $ 100,000,000 |  |  |  | $ 100,000,000 |  |  |  |  |  |  |
Gross amounts of recognized liabilities |  |  |  |  |  |  | $ 54,893,000 |  |  |  | $ 52,738,000 |  |  |  |  |  |  |
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of extension maturity periods | Extension |  |  |  |  |  |  | 1 |  |  |  | 1 |  |  |  |  |  |  |
Length of extension options |  |  |  |  |  |  | 12 months |  |  |  | 12 months |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts offset in the balance sheet |  |  |  |  |  |  | $ 79,822,000 |  |  |  | $ 72,154,000 |  |  |  |  |  |  |
7/20/2021 | Committed Loan Repurchase Facility | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 4.61% |  |  |  | 4.58% |  |  |  |  |  |  |
7/20/2021 | Committed Loan Repurchase Facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 4.98% |  |  |  | 4.96% |  |  |  |  |  |  |
Non-Recourse Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, debt |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |
Credit Agreement and Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  |  |  |  |  |  | 9,000,000 |  |  |  | $ 6,300,000 |  |  |  |  |  |  |
Mortgage loan financing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loan receivables held for investment, net, at amortized cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loan financing |  |  |  |  |  |  | 739,500,000 | $ 743,900,000 |  |  |  |  |  |  |  |  |  |
Net unamortized premiums |  |  |  |  |  |  | 5,800,000 |  |  |  |  |  |  |  |  |  |  |
Amortization of premiums |  |  |  |  |  |  | 400,000 |  |  |  |  |  |  |  |  |  |  |
Pledged assets, real estate and lease intangibles, net |  |  |  |  |  |  | $ 931,300,000 |  |  |  | $ 939,400,000 |  |  |  |  |  |  |
Number of agreements | agreement |  |  |  |  |  |  | 2 |  |  | 3 |  |  |  |  |  |  |  |
Mortgage loan financing | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loan receivables held for investment, net, at amortized cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate on debt instrument (as a percent) |  |  |  |  |  |  | 4.25% |  |  |  |  |  |  |  |  |  |  |
Mortgage loan financing | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loan receivables held for investment, net, at amortized cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate on debt instrument (as a percent) |  |  |  |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  |  |
Borrowings from the Federal Home Loan Bank | Tuebor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committed Loan and Securities Repurchase Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt borrowings term |  |  |  |  |  |  | 5 years 6 months 3 days |  |  |  | 5 years 9 months |  |  |  |  |  |  |
Borrowings from Federal Home Loan Bank (FHLB) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum advance limit |  |  |  |  |  | $ 2,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Advance rates of total assets (as a percent) |  |  |  |  |  | 40.00% |  |  |  |  |  |  |  |  |  |  |  |
Advance rates of total equity (as a percent) |  |  |  |  |  | 150.00% |  |  |  |  |  |  |  |  |  |  |  |
FHLB borrowings outstanding |  |  |  |  |  |  | $ 1,300,000,000 |  |  |  | $ 1,300,000,000 |  |  |  |  |  |  |
Additional committed term financing available from FHLB |  |  |  |  |  |  | $ 654,300,000 |  |  |  | $ 647,500,000 |  |  |  |  |  |  |
Weighted average term |  |  |  |  |  |  | 2 years 4 months 24 days |  |  |  | 2 years 6 months |  |  |  |  |  |  |
Weighted average interest rate |  |  |  |  |  |  | 2.61% |  |  |  | 2.55% |  |  |  |  |  |  |
Maximum percent of FHLB advances to total assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40.00%
Borrowings from the Federal Home Loan Bank | Tuebor | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advance rates (as a percent) |  |  |  |  |  |  | 53.90% |  |  |  | 56.40% |  |  |  |  |  |  |
Mortgage loan receivables held for investment, net, at amortized cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate on debt instrument (as a percent) |  |  |  |  |  |  | 1.47% |  |  |  | 1.18% |  |  |  |  |  |  |
Borrowings from the Federal Home Loan Bank | Tuebor | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing Under Credit Facilties and Debt Issuance Costs [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advance rates (as a percent) |  |  |  |  |  |  | 100.00% |  |  |  | 95.20% |  |  |  |  |  |  |
Mortgage loan receivables held for investment, net, at amortized cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate on debt instrument (as a percent) |  |  |  |  |  |  | 3.08% |  |  |  | 3.01% |  |  |  |  |  |  |
Borrowings from the Federal Home Loan Bank | Tuebor | CMBS and U.S. Agency Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings from Federal Home Loan Bank (FHLB) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral for debt instrument |  |  |  |  |  |  | $ 942,900,000 |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |
Borrowings from the Federal Home Loan Bank | Tuebor | First mortgage commercial real estate loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings from Federal Home Loan Bank (FHLB) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral for debt instrument |  |  |  |  |  |  | 660,000,000 |  |  |  | $ 637,200,000 |  |  |  |  |  |  |
Affiliated Entity | Various Date | CLO Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% | 18.50% |
Scenario, Forecast | Borrowings from the Federal Home Loan Bank | Tuebor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings from Federal Home Loan Bank (FHLB) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum advance limit |  |  |  |  |  |  |  |  |  |  |  | $ 750,000,000 | $ 1,500,000,000 |  |  |  |  |
B Participation Interest | Affiliated Entity | Participation Financing - Mortgage Loan Receivable | Related Reserve IV LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized Debt Obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, debt |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |
LCFH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings from Federal Home Loan Bank (FHLB) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in LCFH |  |  |  |  |  |  | 89.00% |  |  |  |  |  |  |  |  |  |  |
LCFH | LCFC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings from Federal Home Loan Bank (FHLB) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in LCFH |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |

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