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LOANS - Summary of Commercial Real Estate Investments Held for Investment (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 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 Principal |  | $ 119,035,166 | $ 96,602,237 |  |
Loans, net (includes pledged assets of $2,614,982 and $2,997,051, respectively) (4) | [1] | 3,546,468 | 4,585,975 | [2] |
Carrying value, unamortized origination fees |  | 7,100 | 7,600 |  |
Commercial Mortgage |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Outstanding Principal |  | 1,429,914 | 1,307,911 |  |
Loans, net (includes pledged assets of $2,614,982 and $2,997,051, respectively) (4) |  | $ 1,413,605 | $ 1,296,803 |  | $ 1,029,327
Percentage of Loan Portfolio |  | 100.00% | 100.00% |  |
Commercial Mortgage | Senior mortgages |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Outstanding Principal |  | $ 351,907 | $ 988,248 |  |
Loans, net (includes pledged assets of $2,614,982 and $2,997,051, respectively) (4) |  | $ 350,398 | $ 981,202 |  | 625,900
Percentage of Loan Portfolio |  | 24.60% | 75.60% |  |
Commercial Mortgage | Senior Securitized Mortgages |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Outstanding Principal |  | $ 795,052 | $ 0 |  |
Loans, net (includes pledged assets of $2,614,982 and $2,997,051, respectively) (4) |  | $ 789,900 | $ 0 |  |
Percentage of Loan Portfolio |  | 55.60% | 0.00% |  |
Mezzanine loans | Commercial Mortgage |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Outstanding Principal |  | $ 282,955 | $ 319,663 |  |
Loans, net (includes pledged assets of $2,614,982 and $2,997,051, respectively) (4) |  | $ 273,307 | $ 315,601 |  | $ 394,442
Percentage of Loan Portfolio |  | 19.80% | 24.40% |  |
[1] | (4) Includes $119.7 million and $97.5 million of residential mortgage loans held for sale, $41.9 million and $42.2 million of commercial mortgage loans held for sale and $26.9 million and $0 of corporate loans held for sale at June 30, 2019 and December 31, 2018, respectively.
[2] | (1) Derived from the audited consolidated financial statements at December 31, 2018.

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