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Borrowings - Schedule of Match Funded Liabilities (Footnote) (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Available borrowing capacity that could be used based on amount of eligible collateral pledged $ 121,100,000  
Series 2014 Variable Funding Notes [Member]    
Debt Instrument [Line Items]    
Maximum borrowing capacity 70,000,000.0 $ 105,000,000.0
Series 2016 and 2017 Term Notes [Member]    
Debt Instrument [Line Items]    
Total borrowing capacity $ 750,000,000.0  
Series 2016 and 2017 Term Notes [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Debt instrument, interest rate 2.4989%  
Series 2016 and 2017 Term Notes [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Debt instrument, interest rate 4.4456%  
Advance Receivables Backed Notes, Series 2014-VF1 [Member]    
Debt Instrument [Line Items]    
Maximum borrowing capacity $ 55,000,000.0  
Advance Receivables Backed Notes, Series 2014-VF1 [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Basis spread on variable rate 2.35%  
Advance Receivables Backed Notes, Series 2014-VF1 [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Basis spread on variable rate 4.75%  
Advance Receivables Backed Notes, Series 2015-VF1 [Member]    
Debt Instrument [Line Items]    
Maximum borrowing capacity $ 110,000,000.0  
Advance Receivables Backed Notes, Series 2015-VF1 [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Debt instrument, interest rate 2.50%  
Advance Receivables Backed Notes, Series 2015-VF1 [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Debt instrument, interest rate 5.00%  
London Interbank Offered Rate (LIBOR) [Member]    
Debt Instrument [Line Items]    
Debt instrument, interest rate 1.88% 1.564%
Basis spread on variable rate [1] 2.60%  
London Interbank Offered Rate (LIBOR) [Member] | Series 2014 Variable Funding Notes [Member]    
Debt Instrument [Line Items]    
Ceiling percentage of 1ML in determining interest rate 1.25%  
London Interbank Offered Rate (LIBOR) [Member] | Series 2014 Variable Funding Notes [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Basis spread on variable rate 2.35%  
London Interbank Offered Rate (LIBOR) [Member] | Series 2014 Variable Funding Notes [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Basis spread on variable rate 6.35%  
London Interbank Offered Rate (LIBOR) [Member] | Advance Receivables Backed Notes, Series 2014-VF1 [Member]    
Debt Instrument [Line Items]    
Ceiling percentage of 1ML in determining interest rate 3.00%  
London Interbank Offered Rate (LIBOR) [Member] | Advance Receivables Backed Notes, Series 2015-VF1 [Member]    
Debt Instrument [Line Items]    
Ceiling percentage of 1ML in determining interest rate 3.00%  
[1] Represents amounts due to the holders of beneficial interests in Ginnie Mae guaranteed HMBS. The beneficial interests have no maturity dates, and the borrowings mature as the related loans are repaid.