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Fair Value - Narrative (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
HMBS - Related Borrowings [Member]
Dec. 31, 2013
HMBS - Related Borrowings [Member]
Minimum [Member]
Dec. 31, 2013
HMBS - Related Borrowings [Member]
Maximum [Member]
Dec. 31, 2013
Borrowings [Member]
Dec. 31, 2013
Loans Held for Investment - Reverse Mortgages [Member]
Dec. 31, 2013
Loans Held for Investment - Reverse Mortgages [Member]
Minimum [Member]
Dec. 31, 2013
Loans Held for Investment - Reverse Mortgages [Member]
Maximum [Member]
Dec. 31, 2013
Mortgage Servicing Rights [Member]
Dec. 31, 2013
Mortgage Servicing Rights [Member]
Minimum [Member]
Dec. 31, 2013
Mortgage Servicing Rights [Member]
Maximum [Member]
Dec. 31, 2013
Fair Value Mortgage Servicing Rights [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                          
Losses attributable to derivatives $ 1.2 $ 5.1                      
Life     6 years 5 months 1 day 2 years 8 months 27 days 22 years 6 months 18 days   7 years 1 month 6 days 2 years 9 months 4 days 23 years 3 months        
Repayment rate     9.65% 4.83% 37.97%   9.65% 4.83% 38.40%        
Prepayment rate                   13.90% 6.41% 17.50% 7.75%
Delinquency rate                   17.32% 6.18% 30.82%  
Fair value inputs basis spread on variable rate                     0.00% 3.75%  
Discount rate     1.17%     5.57% 1.72%     11.64% 9.98% 16.73% 9.00%