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Bank Loans (Aging Of The Recorded Investment In Past Due Loans) (Details) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due $ 18,920,000 $ 22,170,000
Current Balance 9,178,712,000 8,559,477,000
Recorded Investment in Loans, Total 9,197,632,000 8,581,647,000
Non-Accrual 15,985,000 [1] 15,298,000 [2]
Restructured 165,000 [1] 9,103,000 [2]
Total 16,150,000 [1] 24,401,000 [2]
Loans past due 90 days and still accruing interest 0 0
30 - 89 Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 3,409,000 7,003,000
90 or More Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 15,511,000 15,167,000
Commercial And Industrial [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 14,116,000 14,656,000
Current Balance 3,301,590,000 3,289,578,000
Recorded Investment in Loans, Total 3,315,706,000 3,304,234,000
Non-Accrual 14,116,000 [1] 14,741,000 [2]
Restructured [2]   8,936,000
Total 14,116,000 [1] 23,677,000 [2]
Commercial And Industrial [Member] | 90 or More Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 14,116,000 14,656,000
Residential Real Estate [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 4,266,000 7,347,000
Current Balance 3,039,005,000 2,867,667,000
Recorded Investment in Loans, Total 3,043,271,000 2,875,014,000
Non-Accrual 1,532,000 [1] 352,000 [2]
Restructured 165,000 [1] 167,000 [2]
Total 1,697,000 [1] 519,000 [2]
Residential Real Estate [Member] | 30 - 89 Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 3,018,000 6,970,000
Residential Real Estate [Member] | 90 or More Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 1,248,000 377,000
Securities-Based Loans [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Current Balance 1,986,339,000 1,786,966,000
Recorded Investment in Loans, Total 1,986,339,000 1,786,966,000
Commercial Real Estate [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Current Balance 387,868,000 318,961,000
Recorded Investment in Loans, Total 387,868,000 318,961,000
Construction And Land [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Current Balance 293,116,000 138,245,000
Recorded Investment in Loans, Total 293,116,000 138,245,000
Home Equity Lines Of Credit [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 216,000 33,000
Current Balance 50,302,000 38,065,000
Recorded Investment in Loans, Total 50,518,000 38,098,000
Non-Accrual 184,000 [1] 184,000 [2]
Total 184,000 [1] 184,000 [2]
Home Equity Lines Of Credit [Member] | 30 - 89 Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 216,000 33,000
Other [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 322,000 134,000
Current Balance 120,492,000 119,995,000
Recorded Investment in Loans, Total 120,814,000 120,129,000
Non-Accrual 153,000 [1] 21,000 [2]
Total 153,000 [1] 21,000 [2]
Other [Member] | 30 - 89 Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due 175,000  
Other [Member] | 90 or More Days Past Due [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Total Past Due $ 147,000 $ 134,000
[1] There were no loans past due 90 days and still accruing interest at September 30, 2019.
[2] There were no loans past due 90 days and still accruing interest at December 31, 2018.