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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, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | --- | --- | --- | --- | ---
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | $ 2,307 |  | $ 3,375 |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 59,922 |  | 41,788 |  |  |
Allowance for Loan Losses, Total | 62,229 | $ 54,202 | 45,163 | $ 39,145 | $ 35,866 | $ 29,787
Recorded Investment in Loans, Individually Evaluated for Impairment | 15,009 |  | 26,934 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 6,868,882 |  | 5,610,631 |  |  |
Recorded Investment in Loans, Total | 6,883,891 |  | 5,637,565 |  |  |
Residential Real Estate [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 24 |  | 24 |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 7,111 |  | 2,636 |  |  |
Allowance for Loan Losses, Total | 7,135 | 5,569 | 2,660 | 1,875 | 1,529 | 1,241
Recorded Investment in Loans, Individually Evaluated for Impairment | 173 |  | 178 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 2,517,370 |  | 2,161,222 |  |  |
Recorded Investment in Loans, Total | 2,517,543 |  | 2,161,400 |  |  |
Commercial And Industrial [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 2,131 |  | 2,392 |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 45,021 |  | 32,735 |  |  |
Allowance for Loan Losses, Total | 47,152 | 40,805 | 35,127 | 32,180 | 29,816 | 24,748
Recorded Investment in Loans, Individually Evaluated for Impairment | 14,511 |  | 16,815 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 2,365,906 |  | 1,693,584 |  |  |
Recorded Investment in Loans, Total | 2,380,417 |  | 1,710,399 |  |  |
Securities-Based Loans [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 3,312 |  | 3,094 |  |  |
Allowance for Loan Losses, Total | 3,312 | 3,600 | 3,094 | 1,903 | 1,731 | 1,607
Recorded Investment in Loans, Collectively Evaluated for Impairment | 1,839,981 |  | 1,614,033 |  |  |
Recorded Investment in Loans, Total | 1,839,981 |  | 1,614,033 |  |  |
Commercial Real Estate [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment |  |  | 722 |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 1,027 |  | 641 |  |  |
Allowance for Loan Losses, Total | 1,027 | 932 | 1,363 | 504 | 512 | 264
Recorded Investment in Loans, Individually Evaluated for Impairment |  |  | 9,522 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 78,614 |  | 69,189 |  |  |
Recorded Investment in Loans, Total | 78,614 |  | 78,711 |  |  |
Consumer [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 3 |  | 6 |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 100 |  | 123 |  |  |
Allowance for Loan Losses, Total | 103 | 105 | 129 | 295 | 107 | 105
Recorded Investment in Loans, Individually Evaluated for Impairment | 3 |  | 6 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 36,146 |  | 45,385 |  |  |
Recorded Investment in Loans, Total | 36,149 |  | 45,391 |  |  |
Home Equity Lines Of Credit [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 149 |  | 231 |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 122 |  | 140 |  |  |
Allowance for Loan Losses, Total | 271 | 283 | 371 | 285 | 283 | 290
Recorded Investment in Loans, Individually Evaluated for Impairment | 322 |  | 413 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 12,750 |  | 14,595 |  |  |
Recorded Investment in Loans, Total | 13,072 |  | 15,008 |  |  |
Construction And Land [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 233 |  | 232 |  |  |
Allowance for Loan Losses, Total | 233 | 224 | 232 | 203 | 144 | 78
Recorded Investment in Loans, Collectively Evaluated for Impairment | 18,115 |  | 12,623 |  |  |
Recorded Investment in Loans, Total | 18,115 |  | 12,623 |  |  |
Qualitative [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 2,996 |  | 2,187 |  |  |
Allowance for Loan Losses, Total | $ 2,996 | $ 2,684 | $ 2,187 | $ 1,900 | $ 1,744 | $ 1,454

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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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