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Borrowings - Schedule of Other Secured Borrowings (Footnote) (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 18, 2019
Sep. 30, 2019
Sep. 30, 2019
Dec. 31, 2018
Jul. 01, 2019
Feb. 28, 2019
Feb. 04, 2019
Debt Instrument [Line Items]              
Available borrowing capacity   $ 0 $ 0        
Proceeds from additional borrowings on SSTL $ 120,000,000            
Maximum borrowing capacity         $ 300,000,000    
Amended Senior Secured Term Loan [Member]              
Debt Instrument [Line Items]              
Periodic prepayment of SSTL   6,400,000   $ 4,200,000      
Repurchase Agreements [Member]              
Debt Instrument [Line Items]              
Maximum borrowing capacity   175,000,000 175,000,000        
Borrowings available on committed basis   $ 100,000,000 $ 100,000,000        
Participation Agreement [Member]              
Debt Instrument [Line Items]              
Maximum borrowing capacity             $ 300,000,000
London Interbank Offered Rate (LIBOR) [Member]              
Debt Instrument [Line Items]              
Basis spread on variable rate     2.02% 2.50%      
OASIS Series 2014-1 [Member]              
Debt Instrument [Line Items]              
Basis spread on variable rate     3.00%        
Basis spread on UPB     0.21%        
IndyMac Mortgage Loan Trust [Member] | Minimum [Member]              
Debt Instrument [Line Items]              
Weighted average interest rate   3.70% 3.70%        
IndyMac Mortgage Loan Trust [Member] | Maximum [Member]              
Debt Instrument [Line Items]              
Weighted average interest rate   4.24% 4.24%        
Residential Asset Securitization Trust [Member] | Minimum [Member]              
Debt Instrument [Line Items]              
Weighted average interest rate   4.25% 4.25%        
Residential Asset Securitization Trust [Member] | Maximum [Member]              
Debt Instrument [Line Items]              
Weighted average interest rate   5.75% 5.75%        
Secured Debt [Member]              
Debt Instrument [Line Items]              
Available borrowing capacity   $ 101,067,000 $ 101,067,000        
Secured Debt [Member] | Senior Secured Term Loan [Member]              
Debt Instrument [Line Items]              
Available borrowing capacity   0 0        
Secured Debt [Member] | Participation Agreement [Member]              
Debt Instrument [Line Items]              
Available borrowing capacity   0 $ 0        
Basis spread on variable rate     1.35%        
Secured Debt [Member] | Repurchase Agreements [Member]              
Debt Instrument [Line Items]              
Available borrowing capacity   0 $ 0        
Secured Debt [Member] | Mortgage Loan Warehouse Agreement [Member]              
Debt Instrument [Line Items]              
Available borrowing capacity   0 0        
Secured Debt [Member] | Master Repurchase Agreement [Member]              
Debt Instrument [Line Items]              
Available borrowing capacity   101,067,000 101,067,000        
Secured Debt [Member] | Master Repurchase Agreement [Member]              
Debt Instrument [Line Items]              
Available borrowing capacity   $ 0 $ 0        
Basis spread on variable rate     0.00%        
Interest rate at index floor rate   4.00% 4.00%        
Secured Debt [Member] | London Interbank Offered Rate (LIBOR) [Member] | Master Repurchase Agreement [Member]              
Debt Instrument [Line Items]              
Basis spread on variable rate     1.70%        
Secured Debt [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Participation Agreement [Member]              
Debt Instrument [Line Items]              
Basis spread on variable rate     2.50%        
Secured Debt [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Repurchase Agreements [Member]              
Debt Instrument [Line Items]              
Basis spread on variable rate     1.95%        
Secured Debt [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Mortgage Loan Warehouse Agreement [Member]              
Debt Instrument [Line Items]              
Basis spread on variable rate     2.75%        
Secured Debt [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Master Repurchase Agreement [Member]              
Debt Instrument [Line Items]              
Interest rate at index floor rate   2.25% 2.25%        
Secured Debt [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Participation Agreement [Member]              
Debt Instrument [Line Items]              
Basis spread on variable rate     3.50%        
Secured Debt [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Repurchase Agreements [Member]              
Debt Instrument [Line Items]              
Basis spread on variable rate     3.00%        
Secured Debt [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Mortgage Loan Warehouse Agreement [Member]              
Debt Instrument [Line Items]              
Basis spread on variable rate     3.50%        
Secured Debt [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Master Repurchase Agreement [Member]              
Debt Instrument [Line Items]              
Interest rate at index floor rate   2.75% 2.75%        
Secured Debt [Member] | Eurodollar [Member] | Senior Secured Term Loan [Member]              
Debt Instrument [Line Items]              
Basis spread on variable rate     5.00%        
Interest rate at index floor rate   1.00% 1.00%        
Financing Liability – Advances Pledged [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Debt Instrument [Line Items]              
Weighted average interest rate   4.50% 4.50%        
Secured Debt [Member] | Participation Agreement [Member]              
Debt Instrument [Line Items]              
Maximum borrowing capacity   $ 175,000,000.0 $ 175,000,000.0     $ 75,000,000.0  
Secured Debt [Member] | Mortgage Loan Warehouse Agreement [Member]              
Debt Instrument [Line Items]              
Maximum borrowing capacity   100,000,000 $ 100,000,000        
Beneficial interest     100.00%        
Secured Debt [Member] | Master Repurchase Agreement [Member]              
Debt Instrument [Line Items]              
Maximum borrowing capacity   250,000,000 $ 250,000,000        
Beneficial interest     100.00%        
Borrowings available on committed basis   200,000,000 $ 200,000,000        
Secured Debt [Member] | Master Repurchase Agreement [Member]              
Debt Instrument [Line Items]              
Maximum borrowing capacity   50,000,000.0 50,000,000.0        
Secured Debt [Member] | Master Repurchase Agreement [Member]              
Debt Instrument [Line Items]              
Maximum borrowing capacity   200,000,000.0 $ 200,000,000.0        
Secured Debt [Member] | Participation Agreement [Member]              
Debt Instrument [Line Items]              
Beneficial interest     100.00%        
Secured Debt [Member] | Senior Secured Term Loan Option One [Member] | Federal Funds Rate [Member]              
Debt Instrument [Line Items]              
Basis spread on variable rate     0.50%        
Secured Debt [Member] | Senior Secured Term Loan Option One [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Debt Instrument [Line Items]              
Basis spread on variable rate     4.00%        
Secured Debt [Member] | Senior Secured Term Loan Option One [Member] | Base Rate [Member]              
Debt Instrument [Line Items]              
Basis spread on variable rate     2.00%        
Secured Debt [Member] | Senior Secured Term Loan Option Two [Member] | Eurodollar [Member]              
Debt Instrument [Line Items]              
Basis spread on variable rate     5.00%        
Secured Debt [Member] | Senior Secured Term Loan Option Two [Member] | Eurodollar Floor [Member]              
Debt Instrument [Line Items]              
Basis spread on variable rate     1.00%        
Mortgage Loan Warehouse Facility [Member]              
Debt Instrument [Line Items]              
Available borrowing capacity   $ 0 $ 0        
HMBS - Related Borrowings [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Debt Instrument [Line Items]              
Basis spread on variable rate     2.60%