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Borrowings - Schedule of Other Secured Borrowings (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Line of Credit Facility [Line Items]    
Available borrowing capacity $ 0  
Other secured borrowings 6,973,559 $ 6,508,061
Unamortized debt issuance costs - SSTL $ (1,100)  
London Interbank Offered Rate (LIBOR) [Member]    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 2.02% 2.50%
Senior Secured Notes [Member]    
Line of Credit Facility [Line Items]    
Available borrowing capacity $ 101,067  
Other secured borrowings 243,198 $ 155,713
Unamortized debt issuance costs - SSTL (2,861) (3,098)
Discount - SSTL (1,446) (1,577)
Long-term debt $ 708,929 $ 382,538
Weighted average interest rate 5.19% 5.49%
Senior Secured Notes [Member] | Senior Secured Term Loan [Member]    
Line of Credit Facility [Line Items]    
Available borrowing capacity $ 0  
Other secured borrowings $ 332,426 $ 231,500
Maturity date Dec. 31, 2020  
Senior Secured Notes [Member] | Repurchase Agreements [Member]    
Line of Credit Facility [Line Items]    
Available borrowing capacity $ 0  
Other secured borrowings $ 109,039 74,693
Maturity date Sep. 30, 2019  
Senior Secured Notes [Member] | Participation Agreement [Member]    
Line of Credit Facility [Line Items]    
Available borrowing capacity $ 0  
Other secured borrowings $ 0 42,331
Maturity date Jul. 31, 2019  
Basis spread on variable rate 1.35%  
Senior Secured Notes [Member] | Mortgage Loan Warehouse Agreement [Member]    
Line of Credit Facility [Line Items]    
Available borrowing capacity $ 0  
Other secured borrowings $ 19,149 8,009
Maturity date Aug. 31, 2019  
Senior Secured Notes [Member] | Master Repurchase Agreement [Member]    
Line of Credit Facility [Line Items]    
Available borrowing capacity $ 101,067  
Other secured borrowings $ 98,933 30,680
Maturity date Dec. 31, 2019  
Senior Secured Notes [Member] | Master Repurchase Agreement [Member]    
Line of Credit Facility [Line Items]    
Available borrowing capacity $ 0  
Other secured borrowings $ 3,997 0
Maturity date Jan. 31, 2020  
Basis spread on variable rate 0.00%  
Interest rate at index floor rate 4.00%  
Senior Secured Notes [Member] | Master Repurchase Agreement [Member]    
Line of Credit Facility [Line Items]    
Other secured borrowings $ 0 0
Senior Secured Notes [Member] | Participation Agreement [Member]    
Line of Credit Facility [Line Items]    
Other secured borrowings $ 12,080 0
Maturity date Feb. 29, 2020  
Senior Secured Notes [Member] | Agency Mortgage Servicing Rights Financing Facility [Member]    
Line of Credit Facility [Line Items]    
Available borrowing capacity $ 162,388  
Short-term debt 137,612 0
Senior Secured Notes [Member] | Total Servicing Lines Of Credit [Member]    
Line of Credit Facility [Line Items]    
Available borrowing capacity 263,455  
Short term and long term debt $ 713,236 $ 387,213
Senior Secured Notes [Member] | London Interbank Offered Rate (LIBOR) [Member] | Master Repurchase Agreement [Member]    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 1.70%  
Senior Secured Notes [Member] | Eurodollar [Member] | Senior Secured Term Loan [Member]    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 5.00%  
Interest rate at index floor rate 1.00%  
Senior Secured Notes [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Repurchase Agreements [Member]    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 1.95%  
Senior Secured Notes [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Participation Agreement [Member]    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 2.50%  
Senior Secured Notes [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Mortgage Loan Warehouse Agreement [Member]    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 2.75%  
Senior Secured Notes [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Master Repurchase Agreement [Member]    
Line of Credit Facility [Line Items]    
Interest rate at index floor rate 2.25%  
Senior Secured Notes [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Repurchase Agreements [Member]    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 3.00%  
Senior Secured Notes [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Participation Agreement [Member]    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 3.50%  
Senior Secured Notes [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Mortgage Loan Warehouse Agreement [Member]    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 3.50%  
Senior Secured Notes [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Master Repurchase Agreement [Member]    
Line of Credit Facility [Line Items]    
Interest rate at index floor rate 2.75%