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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
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Financing Receivable Allowance For Credit Losses [Line Items]            
Allowance for Loan Losses, Individually Evaluated for Impairment $ 229   $ 272 $ 270    
Allowance for Loan Losses, Collectively Evaluated for Impairment 23,694   20,459 16,834    
Allowance for Loan Losses, Total 23,923 $ 22,567 20,731 17,104 $ 14,131 $ 12,668
Recorded Investment in Loans, Individually Evaluated for Impairment 5,845   942 973    
Recorded Investment in Loans, Collectively Evaluated for Impairment 2,469,970   2,115,692 1,815,693    
Recorded Investment in Loans, Total 2,475,815   2,116,634 1,816,666    
Commercial And Industrial [Member]            
Financing Receivable Allowance For Credit Losses [Line Items]            
Allowance for Loan Losses, Individually Evaluated for Impairment 21     33    
Allowance for Loan Losses, Collectively Evaluated for Impairment 19,276   16,609 13,492    
Allowance for Loan Losses, Total 19,297 18,104 16,609 13,525 11,089 9,832
Recorded Investment in Loans, Collectively Evaluated for Impairment 1,010,810   896,853 750,071    
Recorded Investment in Loans, Total 1,010,810   896,853 750,071    
Consumer [Member]            
Financing Receivable Allowance For Credit Losses [Line Items]            
Allowance for Loan Losses, Individually Evaluated for Impairment 19   13      
Allowance for Loan Losses, Collectively Evaluated for Impairment 1,549   1,242 937    
Allowance for Loan Losses, Total 1,568 1,392 1,255 937 800 892
Recorded Investment in Loans, Individually Evaluated for Impairment 20   13      
Recorded Investment in Loans, Collectively Evaluated for Impairment 983,339   758,275 624,700    
Recorded Investment in Loans, Total 983,359 [1]   758,288 [1] 624,700    
Residential Real Estate [Member]            
Financing Receivable Allowance For Credit Losses [Line Items]            
Allowance for Loan Losses, Individually Evaluated for Impairment 40   87 237    
Allowance for Loan Losses, Collectively Evaluated for Impairment 864   700 327    
Allowance for Loan Losses, Total 904 857 787 564 473 408
Recorded Investment in Loans, Individually Evaluated for Impairment 5,283   378 412    
Recorded Investment in Loans, Collectively Evaluated for Impairment 443,711   432,268 411,027    
Recorded Investment in Loans, Total 448,994   432,646 411,439    
Commercial Real Estate [Member]            
Financing Receivable Allowance For Credit Losses [Line Items]            
Allowance for Loan Losses, Individually Evaluated for Impairment     23      
Allowance for Loan Losses, Collectively Evaluated for Impairment 286   209 243    
Allowance for Loan Losses, Total 286 305 232 243 194 198
Recorded Investment in Loans, Individually Evaluated for Impairment 219   228 238    
Recorded Investment in Loans, Collectively Evaluated for Impairment 19,834   15,674 15,817    
Recorded Investment in Loans, Total 20,053   15,902 16,055    
Home Equity Lines Of Credit [Member]            
Financing Receivable Allowance For Credit Losses [Line Items]            
Allowance for Loan Losses, Individually Evaluated for Impairment 149   149      
Allowance for Loan Losses, Collectively Evaluated for Impairment 116   118 280    
Allowance for Loan Losses, Total 265 269 267 280 290 174
Recorded Investment in Loans, Individually Evaluated for Impairment 323   323 323    
Recorded Investment in Loans, Collectively Evaluated for Impairment 12,276   12,622 14,078    
Recorded Investment in Loans, Total 12,599   12,945 14,401    
Qualitative [Member]            
Financing Receivable Allowance For Credit Losses [Line Items]            
Allowance for Loan Losses, Collectively Evaluated for Impairment 1,603   1,581 1,555    
Allowance for Loan Losses, Total $ 1,603 $ 1,640 $ 1,581 $ 1,555 $ 1,285 $ 1,152
[1] Includes securities-based loans of $ 963.1 million and $732.8 million at June 30, 2015 and December 31, 2014, respectively.