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Loans to Bank Customers Troubled Debt Restructurings (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Residential Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivable, unpaid principal balance	$ 649	$ 516
Financing receivable, modifications, recorded investment	529	452
Installment Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired financing receivable, unpaid principal balance	214	262
Financing receivable, modifications, recorded investment	$ 63	$ 120

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554

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- Definition

Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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