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LOANS - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2018
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Assets |  | $ 119,172,549,000 | $ 105,787,527,000 | [1] |  | $ 105,787,527,000 | [1]
Loans receivable with variable rates of interest |  | 90.00% |  |  |  | 88.00% |
Loan loss provision recorded during period |  | $ 5,703,000 | 3,500,000 |  | $ 0 |  |
Balance of the loan loss provision |  | 9,200,000 | 3,500,000 |  |  | $ 3,500,000 |
Residential mortgages loans | [2] | 3,879,324,000 | 4,585,975,000 | [1] |  | 4,585,975,000 | [1]
Corporate Loans |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Residential mortgages loans |  | 44,500,000 | 0 |  |  | 0 |
Commercial Mortgage Loan |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Residential mortgages loans |  | 42,000,000 | $ 42,200,000 |  |  | $ 42,200,000 |
Residential Mortgage |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Assets |  | $ 1,300,000,000 |  |  |  |  |
Percent of adjustable-rate loans |  | 45.00% | 47.00% |  |  | 47.00% |
Residential mortgages loans |  | $ 101,300,000 | $ 97,500,000 |  |  | $ 97,500,000 |
Minimum |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Senior secured loans, stated maturity |  |  |  |  |  | 5 years |
Maximum |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Senior secured loans, stated maturity |  |  |  |  |  | 7 years |
Commercial Mortgage Loan |  |  |  |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Debt instrument face amount |  | $ 516,113,000 | $ 516,834,000 |  |  | $ 516,834,000 |
[1] | (1) Derived from the audited consolidated financial statements at December 31, 2018.
[2] | (4) Includes $101.3 million and $97.5 million of residential mortgage loans held for sale, $42.0 million and $42.2 million of commercial mortgage loans held for sale and $44.5 million and $0 of corporate loans held for sale at March 31, 2019 and December 31, 2018, respectively.

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