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