Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS IN RESIDENTIAL MORTGAGE LOANS - Carrying Value of Mortgage Loans (Details)

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INVESTMENTS IN RESIDENTIAL MORTGAGE LOANS - Carrying Value of Mortgage Loans (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]    
Accretion of loan discount (premium) and other amortization $ 256,955 $ 359,105
Transfer of loans to real estate owned (43,931)  
PCD Loans    
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]    
Balance, beginning 144,065  
Purchases/additional fundings 0  
Sales 0  
Proceeds from repayments (10,398)  
Accretion of loan discount (premium) and other amortization 9,958  
Provision for loan losses (2,332)  
Transfer of loans to real estate owned (10,937)  
Transfer of loans to held-for-sale (36,163)  
Balance, ending 94,193  
Residential Portfolio Segment | Performing Loans    
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]    
Balance, beginning 591,253  
Purchases/additional fundings 0  
Proceeds from repayments (48,817)  
Accretion of loan discount (premium) and other amortization 6,098  
Provision for loan losses (525)  
Transfer of loans to other assets 0  
Transfer of loans to real estate owned (2,553)  
Transfer of loans to held-for-sale (168)  
Fair value adjustment 1,908  
Balance, ending $ 547,196