Goodwill and Intangible Assets (Intangible Assets Subject To Amortization) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 208,015	$ 200,225
Accumulated Amortization	91,577	80,570
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	168,110	160,745
Accumulated Amortization	72,794	65,254
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	27,131	26,831
Accumulated Amortization	13,200	11,755
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	8,615	8,615
Accumulated Amortization	2,474	816
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	2,714	2,603
Accumulated Amortization	1,794	1,452
Investment Banking Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	1,445	1,431
Accumulated Amortization	$ 1,315	$ 1,293