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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%