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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
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.