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, 2018
Jun. 30, 2017
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]    
Accretion of loan discount and premium amortization, net $ 359,105 $ 545,386
Transfer of loans to real estate owned (52,771)  
PCD Loans    
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]    
Balance, beginning 183,540  
Purchases/additional fundings 29,785  
Sales 0  
Proceeds from repayments (18,296)  
Accretion of loan discount and premium amortization, net 12,265  
Provision for loan losses 0  
Transfer of loans to real estate owned (11,999)  
Transfer of loans to held-for-sale (25,493)  
Balance, ending 169,802  
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 507,615  
Purchases/additional fundings 55,993  
Proceeds from repayments (49,198)  
Accretion of loan discount and premium amortization, net 8,728  
Provision for loan losses (458)  
Transfer of loans to other assets 0  
Transfer of loans to real estate owned (1,711)  
Balance, ending $ 520,969