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Bank Loans (Aging Of The Recorded Investment In Past Due Loans) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Financing Receivable Recorded Investment Past Due [Line Items]      
Total Past Due $ 14,469 $ 11,721  
Current Balance 5,909,155 5,625,844  
Recorded Investment in Loans, Total 5,923,624 5,637,565 $ 3,505,509
Non-Accrual 18,338 [1] 17,234 [2]  
Restructured 9,698 [1],[3] 9,700 [2]  
Total 28,036 [1] 26,934 [2]  
30 - 89 Days Past Due [Member]      
Financing Receivable Recorded Investment Past Due [Line Items]      
Total Past Due 4,761 11,523  
90 or More Days Past Due [Member]      
Financing Receivable Recorded Investment Past Due [Line Items]      
Total Past Due 9,708 198  
Residential Real Estate [Member]      
Financing Receivable Recorded Investment Past Due [Line Items]      
Total Past Due 761 1,923  
Current Balance 2,213,595 2,159,477  
Recorded Investment in Loans, Total 2,214,356 2,161,400 730,683
Restructured 176 [1],[3] 178 [2]  
Total 176 [1] 178 [2]  
Residential Real Estate [Member] | 30 - 89 Days Past Due [Member]      
Financing Receivable Recorded Investment Past Due [Line Items]      
Total Past Due 761 1,923  
Commercial And Industrial [Member]      
Financing Receivable Recorded Investment Past Due [Line Items]      
Current Balance 1,830,865 1,710,399  
Recorded Investment in Loans, Total 1,830,865 1,710,399 1,295,318
Non-Accrual 18,010 [1] 16,815 [2]  
Total 18,010 [1] 16,815 [2]  
Securities-Based Loans [Member]      
Financing Receivable Recorded Investment Past Due [Line Items]      
Current Balance 1,728,516 1,614,033  
Recorded Investment in Loans, Total 1,728,516 1,614,033 1,345,719
Commercial Real Estate [Member]      
Financing Receivable Recorded Investment Past Due [Line Items]      
Total Past Due 13,522 9,522  
Current Balance 65,000 69,189  
Recorded Investment in Loans, Total 78,522 78,711 83,273
Restructured 9,522 [1],[3] 9,522 [2]  
Total 9,522 [1] 9,522 [2]  
Commercial Real Estate [Member] | 30 - 89 Days Past Due [Member]      
Financing Receivable Recorded Investment Past Due [Line Items]      
Total Past Due 4,000 9,522  
Commercial Real Estate [Member] | 90 or More Days Past Due [Member]      
Financing Receivable Recorded Investment Past Due [Line Items]      
Total Past Due 9,522    
Consumer [Member]      
Financing Receivable Recorded Investment Past Due [Line Items]      
Total Past Due 2 2  
Current Balance 42,854 45,389  
Recorded Investment in Loans, Total 42,856 45,391 31,036
Non-Accrual 5 [1] 6 [2]  
Total 5 [1] 6 [2]  
Consumer [Member] | 90 or More Days Past Due [Member]      
Financing Receivable Recorded Investment Past Due [Line Items]      
Total Past Due 2 2  
Home Equity Lines Of Credit [Member]      
Financing Receivable Recorded Investment Past Due [Line Items]      
Total Past Due 184 274  
Current Balance 14,394 14,734  
Recorded Investment in Loans, Total 14,578 15,008 12,511
Non-Accrual 323 [1] 413 [2]  
Total 323 [1] 413 [2]  
Home Equity Lines Of Credit [Member] | 30 - 89 Days Past Due [Member]      
Financing Receivable Recorded Investment Past Due [Line Items]      
Total Past Due   78  
Home Equity Lines Of Credit [Member] | 90 or More Days Past Due [Member]      
Financing Receivable Recorded Investment Past Due [Line Items]      
Total Past Due 184 196  
Construction And Land [Member]      
Financing Receivable Recorded Investment Past Due [Line Items]      
Current Balance 13,931 12,623  
Recorded Investment in Loans, Total $ 13,931 $ 12,623 $ 6,969
[1] There were no loans past due 90 days and still accruing interest at March 31, 2017.
[2] There were no loans past due 90 days and still accruing interest at December 31, 2016.
[3] On non-accrual status.