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Loans to Bank Customers - Nonperforming Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Nonperforming Loans [Line Items] |  |
Nonperforming loans | $ 2,570 | $ 2,703
Residential |  |
Nonperforming Loans [Line Items] |  |
Nonperforming loans | 46 | 49
Installment |  |
Nonperforming Loans [Line Items] |  |
Nonperforming loans | 76 | 79
Secured credit card |  |
Nonperforming Loans [Line Items] |  |
Nonperforming loans | $ 2,448 | $ 2,575

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