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Goodwill and Intangible Assets (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 06, 2019
Nov. 01, 2019
Mar. 31, 2020
Mar. 31, 2019
Schedule of Goodwill and Intangible Assets [Line Items]        
Amortization of intangible assets     $ 5,032 $ 3,593
Customer Relationships [Member]        
Schedule of Goodwill and Intangible Assets [Line Items]        
Weighted-average remaining lives of intangible assets     10 years 6 months  
Trade Name [Member]        
Schedule of Goodwill and Intangible Assets [Line Items]        
Weighted-average remaining lives of intangible assets     9 years 8 months 12 days  
Core Deposits [Member]        
Schedule of Goodwill and Intangible Assets [Line Items]        
Weighted-average remaining lives of intangible assets     3 years 10 months 24 days  
Non-Compete Agreements [Member]        
Schedule of Goodwill and Intangible Assets [Line Items]        
Weighted-average remaining lives of intangible assets     6 years 8 months 12 days  
Investment Banking Backlog [Member]        
Schedule of Goodwill and Intangible Assets [Line Items]        
Weighted-average remaining lives of intangible assets     8 years 6 months  
Acquired Technology [Member]        
Schedule of Goodwill and Intangible Assets [Line Items]        
Weighted-average remaining lives of intangible assets     2 years 4 months 24 days  
MainFirst Bank AG [Member]        
Schedule of Goodwill and Intangible Assets [Line Items]        
Date of acquisition   Nov. 01, 2019    
GMP Capital Inc. [Member]        
Schedule of Goodwill and Intangible Assets [Line Items]        
Date of acquisition Dec. 06, 2019