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Borrowings - Schedule of Other Secured Borrowings (Footnote) (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 18, 2019
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Feb. 28, 2019
Feb. 04, 2019
Debt Instrument [Line Items]            
Available borrowing capacity   $ 23,500,000 $ 23,500,000      
Proceeds from additional borrowings on SSTL $ 120,000,000          
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     2.40% 2.50%    
Senior Secured Notes [Member] | Participation Agreement [Member]            
Debt Instrument [Line Items]            
Maximum borrowing capacity   175,000,000.0 $ 175,000,000.0   $ 75,000,000.0  
Senior Secured Notes [Member] | Mortgage Loan Warehouse Agreement [Member]            
Debt Instrument [Line Items]            
Maximum borrowing capacity   100,000,000 $ 100,000,000      
Beneficial interest     100.00%      
Senior Secured Notes [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      
Senior Secured Notes [Member] | Master Repurchase Agreement [Member]            
Debt Instrument [Line Items]            
Maximum borrowing capacity   50,000,000.0 50,000,000.0      
Senior Secured Notes [Member] | Master Repurchase Agreement [Member]            
Debt Instrument [Line Items]            
Maximum borrowing capacity   200,000,000.0 $ 200,000,000.0      
Senior Secured Notes [Member] | Participation Agreement [Member]            
Debt Instrument [Line Items]            
Beneficial interest     100.00%      
Senior Secured Notes [Member] | Senior Secured Term Loan Option One [Member] | Federal Funds Rate [Member]            
Debt Instrument [Line Items]            
Basis spread on variable rate     0.50%      
Senior Secured Notes [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%      
Senior Secured Notes [Member] | Senior Secured Term Loan Option One [Member] | Base Rate [Member]            
Debt Instrument [Line Items]            
Basis spread on variable rate     2.00%      
Senior Secured Notes [Member] | Senior Secured Term Loan Option Two [Member] | Eurodollar [Member]            
Debt Instrument [Line Items]            
Basis spread on variable rate     5.00%      
Senior Secured Notes [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