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Goodwill and Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 259,102 | $ 200,225
Accumulated Amortization | 97,329 | 80,570
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 198,248 | 160,745
Accumulated Amortization | 75,987 | 65,254
Trade Name [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 28,123 | 26,831
Accumulated Amortization | 13,649 | 11,755
Core Deposits [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 8,615 | 8,615
Accumulated Amortization | 2,985 | 816
Non-Compete Agreements [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 8,319 | 2,603
Accumulated Amortization | 2,828 | 1,452
Investment Banking Backlog [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 4,245 | 1,431
Accumulated Amortization | 1,787 | $ 1,293
Acquired Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 840 |
Accumulated Amortization | 93 |
Estimated GMP Capital Intangibles [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 10,712 |

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