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Loans to Bank Customers - Loan Summary (Details) - USD ($) $ in Thousands | 1 Months Ended |  |
--- | --- | --- | ---
Aug. 31, 2017 | Sep. 30, 2018 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due |  | $ 4,221 | $ 2,241
Total Current or Less Than 30 Days Past Due |  | 19,030 | 16,620
Total Outstanding |  | $ 23,251 | $ 18,861
Past Due, percentage |  | 18.20% | 11.90%
Total Current or Less Than 30 Days Past Due, percentage |  | 81.80% | 88.10%
Total Outstanding, percentage |  | 100.00% | 100.00%
30-59 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due |  | $ 1,601 | $ 1,224
Past Due, percentage |  | 6.90% | 6.50%
60-89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due |  | $ 1,507 | $ 593
Past Due, percentage |  | 6.50% | 3.10%
90 Days or More Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due |  | $ 1,113 | $ 424
Past Due, percentage |  | 4.80% | 2.30%
Residential |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due |  | $ 9 | $ 0
Total Current or Less Than 30 Days Past Due |  | 3,786 | 3,554
Total Outstanding |  | 3,795 | 3,554
Residential | 30-59 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due |  | 0 | 0
Residential | 60-89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due |  | 0 | 0
Residential | 90 Days or More Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due |  | 9 | 0
Commercial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due |  | 8 | 0
Total Current or Less Than 30 Days Past Due |  | 172 | 315
Total Outstanding |  | 180 | 315
Commercial | 30-59 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due |  | 8 | 0
Commercial | 60-89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due |  | 0 | 0
Commercial | 90 Days or More Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due |  | 0 | 0
Installment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due |  | 13 | 1
Total Current or Less Than 30 Days Past Due |  | 996 | 1,378
Total Outstanding |  | 1,009 | 1,379
Installment | 30-59 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due |  | 11 | 1
Installment | 60-89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due |  | 2 | 0
Installment | 90 Days or More Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due |  | 0 | 0
Secured credit card |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due |  | 4,191 | 2,240
Total Current or Less Than 30 Days Past Due |  | 14,076 | 11,373
Total Outstanding |  | 18,267 | 13,613
Secured credit card | 30-59 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due |  | 1,582 | 1,223
Secured credit card | 60-89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due |  | 1,505 | 593
Secured credit card | 90 Days or More Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Past Due |  | $ 1,104 | $ 424
Secured credit card |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Outstanding | $ 8,200 |  |
Collateral pledged | Secured credit card |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing receivable acquired | $ 8,100 |  |

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