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
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