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Business Segments - Narrative (Details) - Segment | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 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% | 24.57% |

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