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Loans to Bank Customers - Troubled Debt Restructurings (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Residential |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivable, unpaid principal balance | $ 422 | $ 516
Financing receivable, modifications, recorded investment | 344 | 452
Installment |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivable, unpaid principal balance | 209 | 262
Financing receivable, modifications, recorded investment | $ 60 | $ 120

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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 + Details
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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 + Details
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