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Nature of Operations and Basis of Presentation (Narrative) (Details) shares in Millions, $ in Millions | Aug. 31, 2018 USD ($) shares | Mar. 19, 2018 USD ($) ClientAdvisor State
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Ziegler [Member] |  |
Nature Of Operations Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |
Date of acquisition |  | Mar. 19, 2018
Number of private client advisors | ClientAdvisor |  | 55
Number of states in which private client advisors operates | State |  | 5
Assets |  | $ 5,000.0
Business Bancshares, Inc. [Member] |  |
Nature Of Operations Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] |  |
Date of acquisition | Aug. 31, 2018 |
Assets | $ 600.0 |
Shares issued for acquisition | shares | 2.0 |

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