Annual report pursuant to Section 13 and 15(d)

FAIR VALUE MEASUREMENT - Inputs Used in Valuing Investments (Details)

v3.20.4
FAIR VALUE MEASUREMENT - Inputs Used in Valuing Investments (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Nonrecurring | Fair Value    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, fair value $ 509,887 $ 1,189,507
Discount Rate | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input 0.073 0.047
Prepayment Rate | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input 0.037 0.082
CDR | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input 0.026 0.027
Loss Severity | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input 0.337 0.284
Collateral Weighted Average Maturity Years | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, term 3 years 7 months 6 days 3 years 8 months 12 days
Performing Loans | Nonrecurring | Fair Value    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, fair value $ 129,345 $ 707,106
Performing Loans | Discount Rate | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input   0.042
Performing Loans | Prepayment Rate | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input   0.117
Performing Loans | CDR | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input   0.026
Performing Loans | Loss Severity | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input   0.273
Performing Loans | Collateral Weighted Average Maturity Years | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, term   4 years 1 month 6 days
Performing Loans | Minimum | Discount Rate | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input 0.048  
Performing Loans | Minimum | Prepayment Rate | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input 0.051  
Performing Loans | Minimum | CDR | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input 0.002  
Performing Loans | Minimum | Loss Severity | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input 0.287  
Performing Loans | Minimum | Collateral Weighted Average Maturity Years | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, term 3 years 1 month 6 days  
Performing Loans | Maximum | Discount Rate | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input 0.085  
Performing Loans | Maximum | Prepayment Rate | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input 0.099  
Performing Loans | Maximum | CDR | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input 0.078  
Performing Loans | Maximum | Loss Severity | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input 1.000  
Performing Loans | Maximum | Collateral Weighted Average Maturity Years | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, term 9 years 1 month 6 days  
Performing Loans | Weighted Average | Discount Rate | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input 0.067  
Performing Loans | Weighted Average | Prepayment Rate | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input 0.088  
Performing Loans | Weighted Average | CDR | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input 0.020  
Performing Loans | Weighted Average | Loss Severity | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input 0.462  
Performing Loans | Weighted Average | Collateral Weighted Average Maturity Years | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, term 4 years 6 months  
Non-Performing Loans | Nonrecurring | Fair Value    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, fair value $ 380,542 $ 482,401
Non-Performing Loans | Discount Rate | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input   0.055
Non-Performing Loans | Prepayment Rate | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input   0.030
Non-Performing Loans | CDR | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input   0.029
Non-Performing Loans | Loss Severity | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input   0.300
Non-Performing Loans | Collateral Weighted Average Maturity Years | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, term   3 years 1 month 6 days
Non-Performing Loans | Minimum | Discount Rate | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input 0.075  
Non-Performing Loans | Minimum | Prepayment Rate | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input 0.020  
Non-Performing Loans | Minimum | CDR | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input 0.029  
Non-Performing Loans | Minimum | Loss Severity | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input 0.085  
Non-Performing Loans | Minimum | Collateral Weighted Average Maturity Years | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, term 2 years 10 months 24 days  
Non-Performing Loans | Maximum | Discount Rate | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input 0.090  
Non-Performing Loans | Maximum | Prepayment Rate | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input 0.020  
Non-Performing Loans | Maximum | CDR | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input 0.029  
Non-Performing Loans | Maximum | Loss Severity | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input 0.300  
Non-Performing Loans | Maximum | Collateral Weighted Average Maturity Years | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, term 3 years 9 months 18 days  
Non-Performing Loans | Weighted Average | Discount Rate | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input 0.075  
Non-Performing Loans | Weighted Average | Prepayment Rate | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input 0.020  
Non-Performing Loans | Weighted Average | CDR | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input 0.029  
Non-Performing Loans | Weighted Average | Loss Severity | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, measurement input 0.295  
Non-Performing Loans | Weighted Average | Collateral Weighted Average Maturity Years | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financing receivable, term 3 years 3 months 18 days  
Residential Mortgage Loans Held-for-Sale, at Fair Value    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, fair value $ 1,646,205  
Residential Mortgage Loans Held-for-Investment, at Fair Value    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans, held-for-investment, fair value $ 674,179  
Residential Mortgage Loans Held-for-Investment, at Fair Value | Minimum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans, held-for-investment, measurement input 0.065  
Residential Mortgage Loans Held-for-Investment, at Fair Value | Minimum | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans, held-for-investment, measurement input 0.023  
Residential Mortgage Loans Held-for-Investment, at Fair Value | Minimum | CDR    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans, held-for-investment, measurement input 0.020  
Residential Mortgage Loans Held-for-Investment, at Fair Value | Minimum | Loss Severity    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans, held-for-investment, measurement input 0.300  
Residential Mortgage Loans Held-for-Investment, at Fair Value | Maximum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans, held-for-investment, measurement input 0.090  
Residential Mortgage Loans Held-for-Investment, at Fair Value | Maximum | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans, held-for-investment, measurement input 0.029  
Residential Mortgage Loans Held-for-Investment, at Fair Value | Maximum | CDR    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans, held-for-investment, measurement input 0.066  
Residential Mortgage Loans Held-for-Investment, at Fair Value | Maximum | Loss Severity    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans, held-for-investment, measurement input 0.658  
Residential Mortgage Loans Held-for-Investment, at Fair Value | Weighted Average | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans, held-for-investment, measurement input 0.068  
Residential Mortgage Loans Held-for-Investment, at Fair Value | Weighted Average | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans, held-for-investment, measurement input 0.024  
Residential Mortgage Loans Held-for-Investment, at Fair Value | Weighted Average | CDR    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans, held-for-investment, measurement input 0.062  
Residential Mortgage Loans Held-for-Investment, at Fair Value | Weighted Average | Loss Severity    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans, held-for-investment, measurement input 0.625  
Consumer Loans Held-for-Investment, at Fair Value    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Consumer loans, at fair value $ 685,575  
Consumer Loans Held-for-Investment, at Fair Value | Minimum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Consumer loans, measurement input 0.075  
Consumer Loans Held-for-Investment, at Fair Value | Minimum | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Consumer loans, measurement input 0.192  
Consumer Loans Held-for-Investment, at Fair Value | Minimum | CDR    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Consumer loans, measurement input 0.052  
Consumer Loans Held-for-Investment, at Fair Value | Minimum | Loss Severity    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Consumer loans, measurement input 0.778  
Consumer Loans Held-for-Investment, at Fair Value | Maximum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Consumer loans, measurement input 0.097  
Consumer Loans Held-for-Investment, at Fair Value | Maximum | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Consumer loans, measurement input 0.351  
Consumer Loans Held-for-Investment, at Fair Value | Maximum | CDR    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Consumer loans, measurement input 0.207  
Consumer Loans Held-for-Investment, at Fair Value | Maximum | Loss Severity    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Consumer loans, measurement input 0.902  
Consumer Loans Held-for-Investment, at Fair Value | Weighted Average | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Consumer loans, measurement input 0.075  
Consumer Loans Held-for-Investment, at Fair Value | Weighted Average | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Consumer loans, measurement input 0.193  
Consumer Loans Held-for-Investment, at Fair Value | Weighted Average | CDR    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Consumer loans, measurement input 0.052  
Consumer Loans Held-for-Investment, at Fair Value | Weighted Average | Loss Severity    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Consumer loans, measurement input 0.779  
IRLCs    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative, fair value $ 289,074  
IRLCs | Minimum | Loan Funding Probability    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative, measurement input 0  
IRLCs | Minimum | Initial Servicing Rights    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative, measurement input 0.70  
IRLCs | Maximum | Loan Funding Probability    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative, measurement input 1  
IRLCs | Maximum | Initial Servicing Rights    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative, measurement input 270.58  
IRLCs | Weighted Average | Loan Funding Probability    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative, measurement input 0.805  
IRLCs | Weighted Average | Initial Servicing Rights    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative, measurement input 106.09  
Mortgage Backed Securities Issued    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities, fair value $ 1,662,852  
Mortgage Backed Securities Issued | Minimum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities, measurement input 1.8  
Mortgage Backed Securities Issued | Minimum | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities, measurement input 3.1  
Mortgage Backed Securities Issued | Minimum | CDR    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities, measurement input 0.5  
Mortgage Backed Securities Issued | Minimum | Loss Severity    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities, measurement input 0.200  
Mortgage Backed Securities Issued | Maximum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities, measurement input 4.5  
Mortgage Backed Securities Issued | Maximum | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities, measurement input 30  
Mortgage Backed Securities Issued | Maximum | CDR    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities, measurement input 10.5  
Mortgage Backed Securities Issued | Maximum | Loss Severity    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities, measurement input 0.900  
Mortgage Backed Securities Issued | Weighted Average | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities, measurement input 3.1  
Mortgage Backed Securities Issued | Weighted Average | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities, measurement input 10.2  
Mortgage Backed Securities Issued | Weighted Average | CDR    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities, measurement input 7.4  
Mortgage Backed Securities Issued | Weighted Average | Loss Severity    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities, measurement input 0.552  
Acquired Loans | Residential Mortgage Loans Held-for-Sale, at Fair Value    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, fair value $ 1,633,628  
Acquired Loans | Residential Mortgage Loans Held-for-Sale, at Fair Value | Minimum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.033  
Acquired Loans | Residential Mortgage Loans Held-for-Sale, at Fair Value | Minimum | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.002  
Acquired Loans | Residential Mortgage Loans Held-for-Sale, at Fair Value | Minimum | CDR    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.020  
Acquired Loans | Residential Mortgage Loans Held-for-Sale, at Fair Value | Minimum | Loss Severity    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.030  
Acquired Loans | Residential Mortgage Loans Held-for-Sale, at Fair Value | Maximum | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.085  
Acquired Loans | Residential Mortgage Loans Held-for-Sale, at Fair Value | Maximum | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.055  
Acquired Loans | Residential Mortgage Loans Held-for-Sale, at Fair Value | Maximum | CDR    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.250  
Acquired Loans | Residential Mortgage Loans Held-for-Sale, at Fair Value | Maximum | Loss Severity    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.500  
Acquired Loans | Residential Mortgage Loans Held-for-Sale, at Fair Value | Weighted Average | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.046  
Acquired Loans | Residential Mortgage Loans Held-for-Sale, at Fair Value | Weighted Average | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.026  
Acquired Loans | Residential Mortgage Loans Held-for-Sale, at Fair Value | Weighted Average | CDR    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.050  
Acquired Loans | Residential Mortgage Loans Held-for-Sale, at Fair Value | Weighted Average | Loss Severity    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.271  
Originated Loans | Residential Mortgage Loans Held-for-Sale, at Fair Value    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, fair value $ 12,577  
Originated Loans | Residential Mortgage Loans Held-for-Sale, at Fair Value | Discount Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.048  
Originated Loans | Residential Mortgage Loans Held-for-Sale, at Fair Value | Prepayment Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.055  
Originated Loans | Residential Mortgage Loans Held-for-Sale, at Fair Value | CDR    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.045  
Originated Loans | Residential Mortgage Loans Held-for-Sale, at Fair Value | Loss Severity    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held-for-sale, measurement input 0.500