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Business Segments - Narrative (Details) - Segment | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |
Number of reportable segments (segment) | 2 |  |
Operating Segments | BankMobile |  |  |
Segment Reporting Information [Line Items] |  |  |
Effective tax rate |  |  | 23.15%
Forecast | Operating Segments | BankMobile |  |  |
Segment Reporting Information [Line Items] |  |  |
Effective tax rate |  | 23.20% |

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