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DEBT OBLIGATIONS, NET - Schedule of Company's Debt Obligations (Details) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 USD ($) Extension | Dec. 31, 2019 USD ($) Extension | Feb. 26, 2020 USD ($) Extension | Feb. 14, 2020 USD ($)
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Debt Obligations Outstanding | $ 1,726,800,000 | $ 1,815,934,000 |  |
Debt obligations | 5,681,020,000 |  |  |
Carrying Amount of Collateral | 0 | 0 |  |
Committed Loan Repurchase Facility |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Committed Financing | 1,550,000,000 | 1,750,000,000 |  |
Debt Obligations Outstanding | 537,018,000 | 702,264,000 |  |
Committed but Unfunded | 1,012,982,000 | 1,047,736,000 |  |
Carrying Amount of Collateral | 819,481,000 | 1,149,281,000 |  |
Fair Value of Collateral | 820,087,000 | 1,152,250,000 |  |
Committed Loan Repurchase Facility | Maturing on 19 December 2022 |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Committed Financing | 500,000,000 | 600,000,000.0 |  | $ 500,000,000.0
Debt Obligations Outstanding | 191,031,000 | 183,828,000 |  |
Committed but Unfunded | 308,969,000 | 416,172,000 |  |
Carrying Amount of Collateral | 295,557,000 | 287,974,000 |  |
Fair Value of Collateral | $ 295,839,000 | $ 288,210,000 |  |
Number of extension maturity periods | Extension | 2 | 2 |  |
Length of extension options | 12 months | 12 months |  |
Committed Loan Repurchase Facility | Maturing On February 26 2021 |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Committed Financing | $ 250,000,000 |  |  |
Debt Obligations Outstanding | 0 |  |  |
Committed but Unfunded | 250,000,000 |  |  |
Carrying Amount of Collateral | 0 |  |  |
Fair Value of Collateral | $ 0 |  |  |
Number of extension maturity periods | Extension | 3 |  |  |
Length of extension options | 12 months |  |  |
Committed Loan Repurchase Facility | Maturing on 19 December 2020 |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Committed Financing | $ 300,000,000 | $ 300,000,000 |  |
Debt Obligations Outstanding | 149,044,000 | 248,182,000 |  |
Committed but Unfunded | 150,956,000 | 51,818,000 |  |
Carrying Amount of Collateral | 231,701,000 | 382,778,000 |  |
Fair Value of Collateral | $ 231,701,000 | $ 382,778,000 |  |
Number of extension maturity periods | Extension | 3 | 3 |  |
Length of extension options | 364 days | 364 days |  |
Committed Loan Repurchase Facility | Maturing on 6 November 2022 |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Committed Financing | $ 300,000,000 | $ 300,000,000 |  |
Debt Obligations Outstanding | 139,394,000 | 98,678,000 |  |
Committed but Unfunded | 160,606,000 | 201,322,000 |  |
Carrying Amount of Collateral | 204,671,000 | 175,000,000 |  |
Fair Value of Collateral | $ 204,859,000 | $ 175,270,000 |  |
Number of extension maturity periods | Extension | 1 | 1 |  |
Length of extension options | 12 months | 12 months |  |
Number of additional extension maturity periods | Extension | 2 | 2 |  |
Length of additional extension maturity periods | 6 months | 6 months |  |
Committed Loan Repurchase Facility | Maturing On 31 December 2022 |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Committed Financing | $ 100,000,000 |  |  |
Debt Obligations Outstanding | 34,599,000 |  |  |
Committed but Unfunded | 65,401,000 |  |  |
Carrying Amount of Collateral | 56,952,000 |  |  |
Fair Value of Collateral | $ 57,088,000 |  |  |
Number of extension maturity periods | Extension | 2 |  |  |
Length of extension options | 12 months |  |  |
Committed Loan Repurchase Facility | Maturing on 24 December 2020 |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Committed Financing | $ 100,000,000 | $ 100,000,000 |  |
Debt Obligations Outstanding | 22,950,000 | 90,927,000 |  |
Committed but Unfunded | 77,050,000 | 9,073,000 |  |
Carrying Amount of Collateral | 30,600,000 | 126,311,000 |  |
Fair Value of Collateral | $ 30,600,000 | $ 126,311,000 |  |
Length of extension options | 364 days | 364 days |  |
Committed Loan Repurchase Facility | Maturing on 23 December 2021 |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Committed Financing |  | $ 500,000,000.0 |  |
Committed Loan Repurchase Facility | Maturing On 24 May 2020 |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Committed Financing |  | 350,000,000 |  |
Debt Obligations Outstanding |  | 70,697,000 |  |
Committed but Unfunded |  | 279,303,000 |  |
Carrying Amount of Collateral |  | 101,590,000 |  |
Fair Value of Collateral |  | $ 103,868,000 |  |
Number of extension maturity periods | Extension |  | 1 |  |
Length of extension options |  | 12 months |  |
Committed Loan Repurchase Facility | Maturing on 3 January 2023 |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Committed Financing |  | $ 100,000,000 |  |
Debt Obligations Outstanding |  | 9,952,000 |  |
Committed but Unfunded |  | 90,048,000 |  |
Carrying Amount of Collateral |  | 75,628,000 |  |
Fair Value of Collateral |  | $ 75,813,000 |  |
Number of extension maturity periods | Extension |  | 2 |  |
Length of extension options |  | 12 months |  |
Committed Securities Repurchase Facility | Maturing on 23 December 2021 |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Committed Financing | $ 708,969,000 | $ 400,000,000.0 |  |
Debt Obligations Outstanding | 477,734,000 | 42,751,000 |  |
Committed but Unfunded | 231,235,000 | 357,249,000 |  |
Carrying Amount of Collateral | 622,653,000 | 52,691,000 |  |
Fair Value of Collateral | 622,653,000 | 52,691,000 |  |
Uncommitted Securities Repurchase Facility | Various Date |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Debt Obligations Outstanding | 712,048,000 | 1,070,919,000 |  |
Carrying Amount of Collateral | 799,466,000 | 1,188,440,000 |  |
Fair Value of Collateral | 799,466,000 | 1,188,440,000 |  |
Restricted securities held-to-maturity | 2,200,000 | 2,200,000 |  |
Total Repurchase Facilities |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Committed Financing | 1,950,000,000 | 2,150,000,000 |  |
Debt Obligations Outstanding | 1,726,800,000 | 1,815,934,000 |  |
Committed but Unfunded | 1,244,217,000 | 1,404,985,000 |  |
Carrying Amount of Collateral | 2,241,600,000 | 2,390,412,000 |  |
Fair Value of Collateral | 2,242,206,000 | 2,393,381,000 |  |
Revolving Credit Facility | Maturing February 11 2021 |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Committed Financing | 266,430,000 |  |  |
Debt Obligations Outstanding | 266,430,000 |  |  |
Committed but Unfunded | $ 0 |  |  |
Number of extension maturity periods | Extension | 4 |  |  |
Length of extension options | 12 months |  |  |
Revolving Credit Facility | Maturing 11 February 2020 |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Committed Financing |  | 266,430,000 |  |
Debt Obligations Outstanding |  | 0 |  |
Committed but Unfunded |  | $ 266,430,000 |  |
Number of extension maturity periods | Extension |  | 4 |  |
Length of extension options |  | 12 months |  |
Mortgage Loan Financing | Various Date |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Committed Financing | $ 806,153,000 | $ 812,606,000 |  |
Debt Obligations Outstanding | 806,153,000 | 812,606,000 |  |
Committed but Unfunded | 0 | 0 |  |
Carrying Amount of Collateral | 967,842,000 | 988,857,000 |  |
Fair Value of Collateral | 1,171,170,000 | 1,192,106,000 |  |
Borrowings from the FHLB | Various Date |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Committed Financing | 1,945,795,000 | 1,945,795,000 |  |
Debt Obligations Outstanding | 1,007,581,000 | 1,073,500,000 |  |
Committed but Unfunded | 938,214,000 | 872,295,000 |  |
Carrying Amount of Collateral | 1,454,039,000 | 1,107,188,000 |  |
Fair Value of Collateral | 1,458,494,000 | 1,113,811,000 |  |
Restricted securities held-to-maturity | 9,900,000 | 9,900,000 |  |
Senior Unsecured Notes |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Unamortized debt issuance costs | (17,841,000) |  |  |
Senior Unsecured Notes | Various Date |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Debt issued | 1,891,897,000 | 1,166,201,000 |  |
Senior Unsecured Notes | 1,874,056,000 | 1,157,833,000 |  |
Committed but Unfunded | 0 | 0 |  |
Unamortized debt issuance costs | (17,800,000) | (8,400,000) |  |
Total Debt Obligations |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Debt issued | 6,860,275,000 | 6,341,032,000 |  |
Debt obligations | 5,681,020,000 | 4,859,873,000 |  |
Committed but Unfunded | 2,182,431,000 | 2,543,710,000 |  |
Carrying Amount of Collateral | 4,663,481,000 | 4,486,457,000 |  |
Fair Value of Collateral | $ 4,871,870,000 | $ 4,699,298,000 |  |
Minimum | Committed Loan Repurchase Facility | Maturing on 19 December 2022 |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Interest rate | 2.20% | 3.24% |  |
Minimum | Committed Loan Repurchase Facility | Maturing On February 26 2021 |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Committed Financing |  |  | $ 250,000,000.0 |
Interest rate | 0.00% |  |  |
Number of extension maturity periods | Extension |  |  | 3 |
Minimum | Committed Loan Repurchase Facility | Maturing on 19 December 2020 |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Interest rate | 2.46% | 3.49% |  |
Minimum | Committed Loan Repurchase Facility | Maturing on 6 November 2022 |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Interest rate | 2.51% | 3.50% |  |
Minimum | Committed Loan Repurchase Facility | Maturing On 31 December 2022 |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Interest rate | 2.83% |  |  |
Minimum | Committed Loan Repurchase Facility | Maturing on 24 December 2020 |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Interest rate | 2.92% | 3.74% |  |
Minimum | Committed Loan Repurchase Facility | Maturing on 23 December 2021 |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Interest rate | 1.50% | 2.50% |  |
Minimum | Committed Loan Repurchase Facility | Maturing On 24 May 2020 |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Interest rate |  | 3.71% |  |
Minimum | Committed Loan Repurchase Facility | Maturing on 3 January 2023 |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Interest rate |  | 3.96% |  |
Minimum | Uncommitted Securities Repurchase Facility | Various Date |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Interest rate | 1.32% | 2.17% |  |
Minimum | Uncommitted Securities Repurchase Facility | Maturing February 11 2021 |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Interest rate | 3.80% |  |  |
Minimum | Mortgage Loan Financing | Various Date |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Interest rate | 3.75% | 3.75% |  |
Minimum | Borrowings from the FHLB | Various Date |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Interest rate |  | 1.47% |  |
Minimum | Senior Unsecured Notes | Various Date |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Interest rate | 0.54% | 5.25% |  |
Maximum | Committed Loan Repurchase Facility | Maturing on 19 December 2022 |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Interest rate | 2.70% | 3.74% |  |
Maximum | Committed Loan Repurchase Facility | Maturing On February 26 2021 |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Committed Financing |  |  | $ 350,000,000.0 |
Interest rate | 0.00% |  |  |
Maximum | Committed Loan Repurchase Facility | Maturing on 19 December 2020 |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Interest rate | 3.83% | 3.74% |  |
Maximum | Committed Loan Repurchase Facility | Maturing on 6 November 2022 |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Interest rate | 2.81% | 3.75% |  |
Maximum | Committed Loan Repurchase Facility | Maturing On 31 December 2022 |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Interest rate | 2.93% |  |  |
Maximum | Committed Loan Repurchase Facility | Maturing on 24 December 2020 |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Interest rate | 4.48% | 3.80% |  |
Maximum | Committed Loan Repurchase Facility | Maturing on 23 December 2021 |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Committed Financing |  |  | $ 500,000,000.0 |
Interest rate | 3.21% | 2.56% |  |
Maximum | Committed Loan Repurchase Facility | Maturing On 24 May 2020 |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Interest rate |  | 3.81% |  |
Maximum | Committed Loan Repurchase Facility | Maturing on 3 January 2023 |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Interest rate |  | 3.99% |  |
Maximum | Uncommitted Securities Repurchase Facility | Various Date |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Interest rate | 3.75% | 3.54% |  |
Maximum | Uncommitted Securities Repurchase Facility | Maturing February 11 2021 |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Interest rate | 5.25% |  |  |
Maximum | Mortgage Loan Financing | Various Date |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Interest rate | 6.75% | 6.75% |  |
Maximum | Borrowings from the FHLB | Various Date |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Interest rate |  | 2.95% |  |
Maximum | Senior Unsecured Notes | Various Date |  |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |  |
Interest rate | 2.95% | 5.875% |  |

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