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Borrowings - Schedule of repurchase and loan agreements (Details)
9 Months Ended
Sep. 30, 2020
USD ($)
extension
Dec. 31, 2019
USD ($)
Nov. 02, 2018
Oct. 16, 2018
Debt Instrument [Line Items]        
Maximum Borrowing Capacity $ 1,734,237,000 $ 2,014,679,000    
Amount of Available Funding 101,451,000 357,327,000    
Book Value of Collateral 1,867,226,000 1,922,105,000    
Repurchase and loan agreements 1,620,968,000 1,644,230,000    
Repurchase and loan agreements        
Debt Instrument [Line Items]        
Amount Outstanding, before unamortized loan discounts and debt issuance costs 1,632,786,000 1,657,352,000    
Less: unamortized loan discounts (2,684,000) (3,632,000)    
Less: deferred debt issuance costs (9,134,000) (9,490,000)    
Repurchase and loan agreements 1,620,968,000 1,644,230,000    
Repurchase agreements | CS Repurchase Agreement        
Debt Instrument [Line Items]        
Amount Outstanding, before unamortized loan discounts and debt issuance costs 118,549,000 109,002,000    
Maximum Borrowing Capacity 200,000,000 250,000,000    
Amount of Available Funding 81,451,000 140,998,000    
Book Value of Collateral $ 125,834,000 111,593,000    
Loan agreement | Nomura Loan Agreement        
Debt Instrument [Line Items]        
Amount Outstanding, before unamortized loan discounts and debt issuance costs   33,671,000    
Maximum Borrowing Capacity   250,000,000    
Amount of Available Funding   216,329,000    
Book Value of Collateral   38,423,000    
Loan agreement | HOME II And III Loan Agreement        
Debt Instrument [Line Items]        
Number of potential renewal extensions | extension 3      
Length of loan term extension option, years 1 year      
Loan agreement | HOME II Loan Agreement        
Debt Instrument [Line Items]        
Amount Outstanding, before unamortized loan discounts and debt issuance costs $ 83,270,000 83,270,000    
Maximum Borrowing Capacity 83,270,000 83,270,000    
Amount of Available Funding 0 0    
Book Value of Collateral 96,207,000 98,150,000    
Loan agreement | HOME III Loan Agreement        
Debt Instrument [Line Items]        
Amount Outstanding, before unamortized loan discounts and debt issuance costs 89,149,000 89,150,000    
Maximum Borrowing Capacity 89,149,000 89,150,000    
Amount of Available Funding 0 0    
Book Value of Collateral $ 106,619,000 $ 108,860,000    
Loan agreement | HOME IV Loan Agreement (A)        
Debt Instrument [Line Items]        
Interest Rate 4.00% 4.00%    
Amount Outstanding, before unamortized loan discounts and debt issuance costs $ 114,201,000 $ 114,201,000    
Maximum Borrowing Capacity 114,201,000 114,201,000    
Amount of Available Funding 0 0    
Book Value of Collateral $ 139,095,000 $ 141,787,000    
Loan agreement | HOME IV Loan Agreement (B)        
Debt Instrument [Line Items]        
Interest Rate 4.00% 4.00%    
Amount Outstanding, before unamortized loan discounts and debt issuance costs $ 114,590,000 $ 114,590,000    
Maximum Borrowing Capacity 114,590,000 114,590,000    
Amount of Available Funding 0 0    
Book Value of Collateral $ 139,983,000 $ 142,620,000    
Loan agreement | Term Loan Agreement        
Debt Instrument [Line Items]        
Interest Rate 5.00% 5.00%    
Amount Outstanding, before unamortized loan discounts and debt issuance costs $ 99,782,000 $ 99,782,000    
Maximum Borrowing Capacity 99,782,000 99,782,000    
Amount of Available Funding 0 0    
Book Value of Collateral $ 108,820,000 $ 111,061,000    
Loan agreement | FYR SFR Loan Agreement        
Debt Instrument [Line Items]        
Interest Rate 4.65% 4.65%    
Amount Outstanding, before unamortized loan discounts and debt issuance costs $ 508,700,000 $ 508,700,000    
Maximum Borrowing Capacity 508,700,000 508,700,000    
Amount of Available Funding 0 0    
Book Value of Collateral 566,466,000 573,961,000    
Loan agreement | MS Loan Agreement        
Debt Instrument [Line Items]        
Amount Outstanding, before unamortized loan discounts and debt issuance costs 504,545,000 504,986,000    
Maximum Borrowing Capacity 504,545,000 504,986,000    
Amount of Available Funding 0 0    
Book Value of Collateral 584,202,000 $ 595,650,000    
Loan agreement | Amherst Promissory Note        
Debt Instrument [Line Items]        
Amount Outstanding, before unamortized loan discounts and debt issuance costs 0      
Maximum Borrowing Capacity 20,000,000      
Amount of Available Funding 20,000,000      
Book Value of Collateral $ 0      
LIBOR | Repurchase agreements | CS Repurchase Agreement        
Debt Instrument [Line Items]        
Interest Rate 3.50% 2.30%    
LIBOR | Repurchase agreements | CS Repurchase Agreement | Minimum        
Debt Instrument [Line Items]        
Interest Rate 0.50%      
LIBOR | Loan agreement | Nomura Loan Agreement        
Debt Instrument [Line Items]        
Interest Rate   2.30%    
LIBOR | Loan agreement | HOME II Loan Agreement        
Debt Instrument [Line Items]        
Interest Rate 2.10% 2.10%    
LIBOR | Loan agreement | HOME III Loan Agreement        
Debt Instrument [Line Items]        
Interest Rate 2.10% 2.10%    
LIBOR | Loan agreement | MS Loan Agreement        
Debt Instrument [Line Items]        
Interest Rate 1.80% 1.80%    
LIBOR | Loan agreement | Amherst Promissory Note        
Debt Instrument [Line Items]        
Interest Rate 5.00%      
Interest rate caps | LIBOR | HOME II And III Loan Agreement        
Debt Instrument [Line Items]        
Interest rate cap, strike rate 4.40%      
Interest rate caps | LIBOR | HOME II Loan Agreement        
Debt Instrument [Line Items]        
Interest rate cap, strike rate       2.30%
Interest rate caps | LIBOR | HOME III Loan Agreement        
Debt Instrument [Line Items]        
Interest rate cap, strike rate       2.30%
Interest rate caps | LIBOR | MS Loan Agreement        
Debt Instrument [Line Items]        
Interest rate cap, strike rate 4.30%   2.50%