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MORTGAGE LOAN RECEIVABLES - Mortgage Loan Receivables by Loan Type (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
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SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Outstanding Face Amount | $ 3,526,512 | $ 3,522,286 |  |
Mortgage loan receivables held-for-sale | 3,489,582 | 3,482,929 |  |
Provision for loan losses | 18,200 | 17,900 | $ 7,000 | $ 4,000
Loans held for sale transferred loan held for investment, book value | 15,400 |  | $ 57,600 |
Carrying value, loan transferred but not considered sold | 15,500 |  |  |
First mortgage loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Outstanding Face Amount | 3,177,676 | 3,192,160 |  |
Carrying Value | 3,159,154 | 3,170,788 |  |
Mezzanine loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Outstanding Face Amount | 144,152 | 148,221 |  |
Carrying Value | 143,599 | 147,602 |  |
Mortgage loans transferred but not considered sold |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Outstanding Face Amount | 15,350 | 0 |  |
Carrying Value | 15,504 | 0 |  |
Mortgage loan receivables held for investment, net, at amortized cost |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Outstanding Face Amount | 3,337,178 | 3,340,381 |  |
Carrying Value | 3,318,257 | 3,318,390 |  |
Mortgage loan receivables held-for-sale | 3,300,057 | 3,300,490 |  |
First mortgage loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Outstanding Face Amount | 189,334 | 181,905 |  |
Mortgage loan receivables held-for-sale | 189,525 | 182,439 |  |
Mortgage loan receivables held for sale |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Outstanding Face Amount | 189,334 | 181,905 |  |
Mortgage loan receivables held-for-sale | $ 189,525 | $ 182,439 |  |

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- Definition Loans Held-for-sale Transferred to Portfolio Loans, Carrying Amount + References No definition available. + Details
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- Definition Loans Held-for-sale Transferred to Portfolio Loans, Carrying Value + References No definition available. + Details
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- Definition Amount of the contractual principal due as of the balance sheet date of the mortgage loan (face amount). + 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 The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82921503&loc=d3e21338-158488 + Details
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- Definition Amount before allowance of commercial loans issued to businesses to acquire, develop, construct, improve, or refinance land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements. + References Reference 1: 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(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5066-111524 Reference 3: 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=6879938&loc=d3e572229-122910 + 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=6879938&loc=d3e572229-122910 + Details
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