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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%