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Non-Interest Revenue - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Contract with customer, liability $ 2.2 $ 2.0  
Contract with customer, asset 1.4 1.1  
Accounting Standards Update 2014-09      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Revenue from contracts with customers $ 5.5 $ 5.9 $ 1.3
Minimum | BankMobile      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Contract with customer, timing of satisfaction of performance obligation and payment P3Y    
Maximum | BankMobile      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Contract with customer, timing of satisfaction of performance obligation and payment P5Y