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Business Changes and Developments - Intangible Assets Associated with Acquisitions (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 3,630 | $ 9,595
Accumulated Amortization | 2,932 | 7,292
Client Related [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 3,630 | 3,830
Accumulated Amortization | 2,932 | 2,743
Other Intangible Assets Associated With Acquisition [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount |  | 5,765
Accumulated Amortization |  | 4,549
Investment Banking [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 0 | 5,320
Accumulated Amortization | 0 | 4,159
Investment Banking [Member] | Client Related [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 0 | 0
Accumulated Amortization | 0 | 0
Investment Banking [Member] | Other Intangible Assets Associated With Acquisition [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount |  | 5,320
Accumulated Amortization |  | 4,159
Investment Management [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 3,630 | 4,275
Accumulated Amortization | 2,932 | 3,133
Investment Management [Member] | Client Related [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 3,630 | 3,830
Accumulated Amortization | $ 2,932 | 2,743
Investment Management [Member] | Other Intangible Assets Associated With Acquisition [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount |  | 445
Accumulated Amortization |  | $ 390

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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