Loans Held for Investment, Allowance for Loan Losses and Loans Held for Sale (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Receivables [Abstract]
Originations of loans held for investment, modified	$ 231.7	$ 180.8	$ 73.5
Proceeds from sale of previously charged-off loans	5.5	1.7	$ 1.0
Allowance for loan losses for non-delinquent loans	27.0	20.5
Allowance for loan losses for delinquent loans	$ 26.3	$ 29.3