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Goodwill and Intangible Assets (Intangible Assets Subject To Amortization) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | $ 208,124 | $ 200,225
Accumulated Amortization | 84,294 | 80,570
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 160,819 | 160,745
Accumulated Amortization | 67,661 | 65,254
Trade Name [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 26,831 | 26,831
Accumulated Amortization | 12,136 | 11,755
Core Deposits [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 8,615 | 8,615
Accumulated Amortization | 1,384 | 816
Non-Compete Agreements [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 2,714 | 2,603
Accumulated Amortization | 1,674 | 1,452
Investment Banking Backlog [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 1,445 | 1,431
Accumulated Amortization | 1,311 | $ 1,293
First Empire [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 7,700 |
Accumulated Amortization | $ 128 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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