Nature of Operations, Basis of Presentation, and Summary of Significant Accounting Policies (Narrative) (Details) - Ziegler [Member] $ in Billions	Mar. 19, 2018 USD ($) ClientAdvisor State
Nature Of Operations Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Number of private client advisors \| ClientAdvisor	55
Number of states in which private client advisors operates \| State	5
Client assets \| $	$ 5

Amount of assets acquired at the acquisition date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

Name:	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant