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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 |  |

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