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Goodwill and Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Dec. 06, 2019 | Nov. 01, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |
Amortization of intangible assets |  |  | $ 4,700 | $ 3,800 | $ 14,489 | $ 10,960
Customer Relationships [Member] |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |
Weighted-average remaining lives of intangible assets |  |  |  |  | 9 years 10 months 24 days |
Trade Name [Member] |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |
Weighted-average remaining lives of intangible assets |  |  |  |  | 9 years 1 month 6 days |
Core Deposits [Member] |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |
Weighted-average remaining lives of intangible assets |  |  |  |  | 3 years 3 months 18 days |
Non-Compete Agreements [Member] |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |
Weighted-average remaining lives of intangible assets |  |  |  |  | 6 years 1 month 6 days |
Investment Banking Backlog [Member] |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |
Weighted-average remaining lives of intangible assets |  |  |  |  | 7 years 10 months 24 days |
Acquired Technology [Member] |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |
Weighted-average remaining lives of intangible assets |  |  |  |  | 1 year 9 months 18 days |
MainFirst Bank AG [Member] |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |
Date of acquisition |  | Jul. 01, 2019 |  |  |  |
GMP Capital Inc. [Member] |  |  |  |  |  |
Schedule of Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |
Date of acquisition | Sep. 03, 2019 |  |  |  |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e848-128460 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e845-128460 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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