Fair Values of Assets and Liabilities Quantitative Information about Level 3 Assets Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015		Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loans and fees receivable, at fair value	$ 13,147		$ 18,255
Loans and fees receivable pledged as collateral under structured financings, at fair value	30,743		34,905
Gross yield	27.90%		27.20%
Principal payment rate	2.80%		2.70%
Expected credit loss rate	13.80%		13.50%
Discount rate	15.90%		15.90%
Loans And Fees Receivable [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loans and fees receivable, at fair value	13,147		18,255
Loans And Fees Receivable [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Gross yield	19.70%		17.90%
Principal payment rate	1.20%		1.50%
Expected credit loss rate	7.00%		7.40%
Servicing rate	5.50%		7.40%
Discount rate	15.90%		15.90%
Loans And Fees Receivable [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Gross yield	25.60%		25.60%
Principal payment rate	3.70%		3.60%
Expected credit loss rate	14.40%		13.70%
Servicing rate	15.60%		15.10%
Discount rate	16.20%		16.20%
Loans And Fees Receivable [Member] | Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Gross yield	22.20%		21.00%
Principal payment rate	2.30%		2.30%
Expected credit loss rate	10.20%		9.90%
Servicing rate	9.90%		10.50%
Discount rate	16.10%		16.10%
Loans and Fees Receivable Pledged as Collateral [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loans and fees receivable, at fair value	$ 30,743		$ 34,905
Gross yield	27.90%	[1]	27.20%	[1]
Principal payment rate	2.80%	[1]	2.70%	[1]
Expected credit loss rate	13.80%	[1]	13.50%	[1]
Servicing rate	11.20%	[1]	11.00%	[1]
Discount rate	15.90%	[1]	15.90%	[1]

[1] (1) Our loans and fees receivable, pledged as collateral under structured financings, at fair value consist of a single portfolio with one set of assumptions. As such, no range is given.