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Goodwill and Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 253,789 | $ 253,941
Accumulated Amortization | 126,064 | 112,957
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 202,190 | 202,342
Accumulated Amortization | 93,819 | 85,152
Trade Name [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 28,659 | 28,659
Accumulated Amortization | 16,973 | 15,660
Non-Compete Agreements [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 9,240 | 9,240
Accumulated Amortization | 5,302 | 4,229
Core Deposits [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 8,615 | 8,615
Accumulated Amortization | 5,944 | 4,809
Investment Banking Backlog [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 4,245 | 4,245
Accumulated Amortization | 3,443 | 2,734
Acquired Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 840 | 840
Accumulated Amortization | $ 583 | $ 373

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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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