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Non-Interest Revenues - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Contract with customer, liability | $ 3,118 |  | $ 3,118 |  | $ 2,001
Contract with customer, asset | 2,500 |  | 2,500 |  | $ 1,100
Accounting Standards Update 2014-09 |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 1,200 | $ 1,300 | $ 2,700 | $ 3,200 |
Minimum | BankMobile |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Timing of satisfaction of performance obligation and payment |  |  | P3Y |  |
Maximum | BankMobile |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Timing of satisfaction of performance obligation and payment |  |  | P5Y |  |

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