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
9 Months Ended
Sep. 30, 2019
Sep. 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 $ 298,933 $ 528,981
Transfer of loans to real estate owned (61,129)  
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 (13,935)  
Accretion of loan discount (premium) and other amortization 12,961  
Provision for loan losses (2,332)  
Transfer of loans to real estate owned (12,815)  
Transfer of loans to held-for-sale (38,674)  
Balance, ending 89,270  
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 (73,397)  
Accretion of loan discount (premium) and other amortization 9,998  
Provision for loan losses (800)  
Transfer of loans to other assets 0  
Transfer of loans to real estate owned (4,739)  
Transfer of loans to held-for-sale (168)  
Fair value adjustment 2,240  
Balance, ending $ 524,387