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Fair Values of Assets and Liabilities Quantitative Information about Level 3 Assets Fair Value Measurements (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Gross yield | 25.90% | 24.60%
Principal payment rate | 2.50% | 2.20%
Expected credit loss rate | 9.40% | 11.80%
Discount rate | 14.20% | 13.60%
Loans And Fees Receivable [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Loans and Fees Receivable, at Fair Value | $ 11,109 | $ 15,648
Loans And Fees Receivable [Member] | Minimum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Gross yield | 15.80% | 24.20%
Principal payment rate | 1.90% | 2.20%
Expected credit loss rate | 9.40% | 11.80%
Servicing rate | 10.20% | 8.60%
Discount rate | 6.00% | 5.80%
Loans And Fees Receivable [Member] | Maximum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Gross yield | 27.40% | 35.80%
Principal payment rate | 3.60% | 3.50%
Expected credit loss rate | 10.40% | 18.00%
Servicing rate | 12.30% | 9.60%
Discount rate | 14.20% | 13.60%
Loans And Fees Receivable [Member] | Weighted Average [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Gross yield | 24.50% | 26.10%
Principal payment rate | 2.60% | 2.40%
Expected credit loss rate | 9.70% | 12.90%
Servicing rate | 10.50% | 8.80%
Discount rate | 12.80% | 12.50%

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- Definition Represents rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value pertaining to servicing costs. + References No definition available. + Details
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- Definition Reflects the fair value of the de-securitized and reconsolidated lower-tier credit card receivables. + References No definition available. + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Rate at which loans or a loan portfolio are expected to prepay principal balances, used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Percentage of likelihood a loan will not be repaid and instead default, used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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