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Acquisitions (Narrative) (Details) $ in Thousands, shares in Millions |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 06, 2019 USD ($) | Nov. 01, 2019 USD ($) | Sep. 27, 2019 USD ($) | Sep. 03, 2019 USD ($) | Jul. 01, 2019 USD ($) | Jan. 02, 2019 USD ($) | Oct. 01, 2018 USD ($) | Aug. 31, 2018 USD ($) shares | Mar. 19, 2018 USD ($) ClientAdvisor State | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  | $ 1,194,074 | $ 1,034,679 | $ 1,034,679
Institutional Group [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  | 849,093 |  | 694,284
Global Wealth Management [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  | 344,981 |  | $ 340,395
GMP Capital Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Date of acquisition | Dec. 06, 2019 |  |  |  |  |  |  |  |  |  |  |
GMP Capital Inc. [Member] | Institutional Group [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 30,500 |  |  |  |  |  |  |  |  |  |  |
MainFirst Bank AG [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Date of acquisition |  | Nov. 01, 2019 |  |  |  |  |  |  |  |  |  |
MainFirst Bank AG [Member] | Tradename, Non-Compete Agreements and Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  | $ 800 |  |  |  |  |  |  |  |  |  |
MainFirst Bank AG [Member] | Institutional Group [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 14,600 |  |  |  |  |  |  |  |  |  |
George K. Baum & Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Date of acquisition |  |  | Sep. 27, 2019 |  |  |  |  |  |  |  |  |
George K. Baum & Company [Member] | Customer Relationships and Non-Compete Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  | $ 15,200 |  |  |  |  |  |  |  |  |
George K. Baum & Company [Member] | Institutional Group [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | $ 33,300 |  |  |  |  |  |  |  |  |
B&F Capital Markets, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Date of acquisition |  |  |  | Sep. 03, 2019 |  |  |  |  |  |  |  |
Period of contingent consideration |  |  |  | 5 years |  |  |  |  |  |  |  |
Liability for earn-out payments |  |  |  |  |  |  |  |  |  | 20,100 |  |
B&F Capital Markets, Inc. [Member] | Tradename, Non-Compete Agreements and Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  | $ 18,600 |  |  |  |  |  |  |  |
B&F Capital Markets, Inc. [Member] | Institutional Group [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 21,200 |  |  |  |  |  |  |  |
Mooreland Partners [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Date of acquisition |  |  |  |  | Jul. 01, 2019 |  |  |  |  |  |  |
Period of contingent consideration |  |  |  |  | 3 years |  |  |  |  |  |  |
Liability for earn-out payments |  |  |  |  |  |  |  |  |  | 18,400 |  |
Mooreland Partners [Member] | Non-Compete Agreements and Backlog [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  | $ 5,000 |  |  |  |  |  |  |
Mooreland Partners [Member] | Institutional Group [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 51,000 |  |  |  |  |  |  |
First Empire Holding Corp. [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Date of acquisition |  |  |  |  |  | Jan. 02, 2019 |  |  |  |  |  |
First Empire Holding Corp. [Member] | Tradename and Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  |  | $ 7,800 |  |  |  |  |  |
First Empire Holding Corp. [Member] | Institutional Group [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 14,900 |  |  |  |  |  |
Rand & Associates [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Period of contingent consideration |  |  |  |  |  |  | 5 years |  |  |  |  |
Liability for earn-out payments |  |  |  |  |  |  |  |  |  | $ 4,400 | $ 4,100 |
Rand & Associates [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  |  |  | $ 4,700 |  |  |  |  |
Rand & Associates [Member] | Global Wealth Management [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 9,300 |  |  |  |  |
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 |  |  |  |
Acquisition of other assets |  |  |  |  |  |  |  | 85,700 |  |  |  |
Acquisition of deposits |  |  |  |  |  |  |  | 501,100 |  |  |  |
Acquisition of other liabilities |  |  |  |  |  |  |  | 21,900 |  |  |  |
Business Bancshares, Inc. [Member] | Core Deposits [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  |  |  |  | 8,600 |  |  |  |
Business Bancshares, Inc. [Member] | Global Wealth Management [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | $ 41,600 |  |  |  |
Ziegler [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Date of acquisition |  |  |  |  |  |  |  |  | Mar. 19, 2018 |  |  |
Goodwill |  |  |  |  |  |  |  |  | $ 19,000 |  |  |
Number of private client advisors | ClientAdvisor |  |  |  |  |  |  |  |  | 55 |  |  |
Number of states in which private client advisors operates | State |  |  |  |  |  |  |  |  | 5 |  |  |
Assets |  |  |  |  |  |  |  |  | $ 5,000,000 |  |  |
Ziegler [Member] | Customer Relationships and Non-Compete Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  |  |  |  |  | $ 9,500 |  |  |

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