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Fair Value - Narrative (Details)
3 Months Ended
Jun. 30, 2016
Loans Held for Investment - Reverse Mortgages [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Life 6 years 5 months 23 days
Repayment rate 19.74%
Discount rate 2.49%
Minimum [Member] | Loans Held for Investment - Reverse Mortgages [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Life 5 years 9 months 25 days
Repayment rate 4.94%
Maximum [Member] | Loans Held for Investment - Reverse Mortgages [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Life 9 years 3 months
Repayment rate 53.75%
HMBS - Related Borrowings [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Life 5 years 4 months 9 days
Repayment rate 19.74%
Discount rate 1.89%
HMBS - Related Borrowings [Member] | Minimum [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Life 4 years 8 months 15 days
Repayment rate 4.94%
HMBS - Related Borrowings [Member] | Maximum [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Life 9 years 3 months
Repayment rate 53.75%