Goodwill and Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Thousands		Sep. 30, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value		$ 290,342	$ 279,590
Accumulated Amortization		162,899	149,001
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value		226,984	225,631
Accumulated Amortization		119,306	109,216
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value		30,359	30,359
Accumulated Amortization		21,995	20,861
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value		10,071	9,440
Accumulated Amortization		8,060	7,158
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value		8,615	8,615
Accumulated Amortization		7,990	7,389
Investment Banking Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value		8,913	5,545
Accumulated Amortization		5,368	$ 4,377
Estimated Sierra Pacific Intangibles Member
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	[1]	5,400
Accumulated Amortization	[1]	$ 180

[1] (1) See discussion regarding the allocation of the estimated goodwill and intangibles recorded for the Sierra Pacific acquisition.