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Acquisitions (Narrative) (Details) shares in Millions |  |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 01, 2018 USD ($) | Aug. 31, 2018 USD ($) shares | Mar. 19, 2018 USD ($) ClientAdvisor State | May 03, 2016 USD ($) | Jan. 04, 2016 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 03, 2017 USD ($) | Dec. 04, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 1,034,679,000 | $ 968,834,000 |  |  |
Restricted stock units, charges at the date of modification |  |  |  |  |  |  | 55,900,000 |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Restricted stock units, charges at the date of modification |  |  |  |  |  |  |  | $ 58,600,000 |  |
Global Wealth Management [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 340,395,000 | 276,477,000 |  |  |
Rand & Associates [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Period of contingent consideration | 5 years |  |  |  |  |  |  |  |  |
Liability for earn-out payments |  |  |  |  |  | $ 4,100,000 |  |  |  |
Rand & Associates [Member] | Global Wealth Management [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill | $ 8,300,000 |  |  |  |  |  |  |  |  |
Rand & Associates [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets | $ 4,600,000 |  |  |  |  |  |  |  |  |
Business Bancshares, Inc. [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Date of acquisition |  | Aug. 31, 2018 |  |  |  |  |  |  |  |
Business acquisition, equity interest issued or issuable, description |  |  |  |  |  | Under the terms of the merger agreement, each outstanding share of BBI common stock (except for shares of BBI common stock held by BBI as treasury stock) were converted into the right to receive 0.705 shares of our company’s common stock, with fractional shares settled with cash. |  |  |  |
Business combination equity interest exchange ratio |  | 0.705 |  |  |  |  |  |  |  |
Shares issued for acquisition | shares |  | 2.0 |  |  |  |  |  |  |  |
Acquisition of loans |  | $ 507,800,000 |  |  |  |  |  |  |  |
Acquisition of other assets |  | 85,700,000 |  |  |  |  |  |  |  |
Acquisition of deposits |  | 501,100,000 |  |  |  |  |  |  |  |
Acquisition of other liabilities |  | 21,900,000 |  |  |  |  |  |  |  |
Business Bancshares, Inc. [Member] | Global Wealth Management [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  | 38,400,000 |  |  |  |  |  |  |  |
Business Bancshares, Inc. [Member] | Core Deposits [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  | $ 8,600,000 |  |  |  |  |  |  |  |
Ziegler [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | $ 19,000,000 |  |  |  |  |  |  |
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 |  |  | $ 5,000,000,000 |  |  |  |  |  |  |
Ziegler [Member] | Customer Relationships and Non-Compete Agreements [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  | $ 9,500,000 |  |  |  |  |  |  |
City Securities Corporation [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | $ 7,100,000 |
Identifiable intangible assets |  |  |  |  |  |  |  |  | $ 4,100,000 |
ISM Capital LLP [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 6,300,000 |  |  |  |  |  |
Identifiable intangible assets |  |  |  | $ 2,300,000 |  |  |  |  |  |
Period of contingent consideration |  |  |  | 3 years |  |  |  |  |  |
Liability for earn-out payments |  |  |  |  |  | $ 0 | 1,900,000 |  |  |
Eaton Partners [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 72,000,000 |  |  |  |  |
Identifiable intangible assets |  |  |  |  | $ 32,300,000 |  |  |  |  |
Period of contingent consideration |  |  |  |  | 4 years |  |  |  |  |
Liability for earn-out payments |  |  |  |  |  | 40,200,000 | 31,200,000 |  |  |
Barclays Wealth and Investment Management, Americas [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  | $ 24,800,000
Deferred consideration, recognized as a liability |  |  |  |  |  | $ 7,400,000 | $ 15,200,000 |  |  |
Barclays Wealth and Investment Management, Americas [Member] | Stifel Bank [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  | 600,000,000
Barclays Wealth and Investment Management, Americas [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  |  |  |  |  |  | $ 7,300,000

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