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Acquisitions and Divestiture (Narrative) (Details) $ in Millions | Mar. 09, 2018 USD ($) | Apr. 28, 2017 USD ($) | Mar. 10, 2017 USD ($) entity | Jul. 13, 2018 USD ($)
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Harrison Finance Company [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Loss from sale of consumer finance subsidiary | $ 1.1 |  |  |
Proceeds from sale of finance subsidiary | $ 78.9 |  |  |
FNBC I [Member] | Whitney Bank [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of branches | entity |  |  | 9 |
Net of cash acquired |  |  | $ 323.0 |
Cash paid |  |  | 326.0 |
Cash acquired |  |  | 3.0 |
Acquisition, Premium amount to pay |  |  | $ 41.6 |
FNBC II [Member] | Whitney Bank [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash received |  | $ 800.0 |  |
Cash acquired |  | 158.0 |  |
Premium payment |  | 35.0 |  |
Unpaid principal balance of the loans acquired, Net liabilities assumed |  | $ 642.0 |  |
Capital One [Member] | Subsequent Event [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Assets under management |  |  |  | $ 4,000.0
Assets under management and administration |  |  |  | 10,400.0
Cash for customer deposit liabilities assumed |  |  |  | $ 217.0

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