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Business Changes and Developments - Intangible Assets Associated with Acquisitions (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 51,595 | $ 51,595
Accumulated Amortization | 41,217 | 32,018
Investment Banking [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 47,320 | 47,320
Accumulated Amortization | 38,523 | 29,762
Investment Management [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 4,275 | 4,275
Accumulated Amortization | 2,694 | 2,256
Client Related [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 45,830 | 45,830
Accumulated Amortization | 37,716 | 29,332
Client Related [Member] | Investment Banking [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 42,000 | 42,000
Accumulated Amortization | 35,356 | 27,355
Client Related [Member] | Investment Management [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 3,830 | 3,830
Accumulated Amortization | 2,360 | 1,977
Other Intangible Assets Associated With Acquisition [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 5,765 | 5,765
Accumulated Amortization | 3,501 | 2,686
Other Intangible Assets Associated With Acquisition [Member] | Investment Banking [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 5,320 | 5,320
Accumulated Amortization | 3,167 | 2,407
Other Intangible Assets Associated With Acquisition [Member] | Investment Management [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 445 | 445
Accumulated Amortization | $ 334 | $ 279

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