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Bank Loans (Recorded Balances Of Loans and Amount Of Allowance Allocated Based Upon Impairment Method by Portfolio Segment) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Financing Receivable Allowance For Credit Losses [Line Items]            
Allowance for Loan Losses, Individually Evaluated for Impairment $ 194   $ 272 $ 266    
Allowance for Loan Losses, Collectively Evaluated for Impairment 27,513   20,459 18,730    
Allowance for Loan Losses, Total 27,707 $ 23,923 20,731 18,996 $ 17,103 $ 12,668
Recorded Investment in Loans, Individually Evaluated for Impairment 1,289   942 936    
Recorded Investment in Loans, Collectively Evaluated for Impairment 2,441,054   2,115,692 1,920,415    
Recorded Investment in Loans, Total 2,442,343   2,116,634 1,921,351    
Commercial And Industrial [Member]            
Financing Receivable Allowance For Credit Losses [Line Items]            
Allowance for Loan Losses, Collectively Evaluated for Impairment 22,414   16,609 15,903    
Allowance for Loan Losses, Total 22,414 19,297 16,609 15,903 13,557 9,832
Recorded Investment in Loans, Collectively Evaluated for Impairment 1,121,643   896,853 833,988    
Recorded Investment in Loans, Total 1,121,643   896,853 833,988    
Consumer [Member]            
Financing Receivable Allowance For Credit Losses [Line Items]            
Allowance for Loan Losses, Individually Evaluated for Impairment 21   13      
Allowance for Loan Losses, Collectively Evaluated for Impairment 1,592   1,242 1,001    
Allowance for Loan Losses, Total 1,613 1,568 1,255 1,001 937 892
Recorded Investment in Loans, Individually Evaluated for Impairment 21   13      
Recorded Investment in Loans, Collectively Evaluated for Impairment 1,026,176   758,275 638,810    
Recorded Investment in Loans, Total 1,026,197 [1]   758,288 [1] 638,810    
Residential Real Estate [Member]            
Financing Receivable Allowance For Credit Losses [Line Items]            
Allowance for Loan Losses, Individually Evaluated for Impairment 24   87 87    
Allowance for Loan Losses, Collectively Evaluated for Impairment 1,098   700 587    
Allowance for Loan Losses, Total 1,122 904 787 674 713 408
Recorded Investment in Loans, Individually Evaluated for Impairment 945   378 378    
Recorded Investment in Loans, Collectively Evaluated for Impairment 260,013   432,268 418,428    
Recorded Investment in Loans, Total 260,958   432,646 418,806    
Commercial Real Estate [Member]            
Financing Receivable Allowance For Credit Losses [Line Items]            
Allowance for Loan Losses, Individually Evaluated for Impairment     23 30    
Allowance for Loan Losses, Collectively Evaluated for Impairment 264   209 209    
Allowance for Loan Losses, Total 264 286 232 239 210 198
Recorded Investment in Loans, Individually Evaluated for Impairment     228 235    
Recorded Investment in Loans, Collectively Evaluated for Impairment 19,811   15,674 15,736    
Recorded Investment in Loans, Total 19,811   15,902 15,971    
Home Equity Lines Of Credit [Member]            
Financing Receivable Allowance For Credit Losses [Line Items]            
Allowance for Loan Losses, Individually Evaluated for Impairment 149   149 149    
Allowance for Loan Losses, Collectively Evaluated for Impairment 104   118 125    
Allowance for Loan Losses, Total 253 265 267 274 131 174
Recorded Investment in Loans, Individually Evaluated for Impairment 323   323 323    
Recorded Investment in Loans, Collectively Evaluated for Impairment 10,937   12,622 13,453    
Recorded Investment in Loans, Total 11,260   12,945 13,776    
Construction And Land [Member]            
Financing Receivable Allowance For Credit Losses [Line Items]            
Allowance for Loan Losses, Collectively Evaluated for Impairment 47          
Allowance for Loan Losses, Total 47         12
Recorded Investment in Loans, Collectively Evaluated for Impairment 2,474          
Recorded Investment in Loans, Total 2,474          
Qualitative [Member]            
Financing Receivable Allowance For Credit Losses [Line Items]            
Allowance for Loan Losses, Collectively Evaluated for Impairment 1,994   1,581 905    
Allowance for Loan Losses, Total $ 1,994 $ 1,603 $ 1,581 $ 905 $ 1,555 $ 1,152
[1] Includes securities-based loans of $ 1.0 billion and $732.8 million at September 30, 2015 and December 31, 2014, respectively.