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Bank Loans (Unpaid Principal Balances Of Loans and Amount Of Allowance Allocated Based Upon Impairment Method by Portfolio Segment) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | $ 8,703 | $ 9,105 |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 77,130 | 58,361 |
Allowance for Loan Losses, Total | 85,833 | 67,466 | $ 45,163
Recorded Investment in Loans, Individually Evaluated for Impairment | 24,401 | 29,213 |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 8,557,246 | 6,985,208 |
Recorded Investment in Loans, Total | 8,581,647 | 7,014,421 |
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 | 11,204 | 8,406 |
Allowance for Loan Losses, Total | 11,228 | 8,430 | 2,660
Recorded Investment in Loans, Individually Evaluated for Impairment | 519 | 171 |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 2,874,495 | 2,593,405 |
Recorded Investment in Loans, Total | 2,875,014 | 2,593,576 |
Commercial And Industrial [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 8,678 | 9,059 |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 59,689 | 45,415 |
Allowance for Loan Losses, Total | 68,367 | 54,474 | 35,127
Recorded Investment in Loans, Individually Evaluated for Impairment | 23,677 | 28,856 |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 3,280,557 | 2,409,082 |
Recorded Investment in Loans, Total | 3,304,234 | 2,437,938 |
Securities-Based Loans [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 1,978 | 2,088 |
Allowance for Loan Losses, Total | 1,978 | 2,088 | 3,094
Recorded Investment in Loans, Collectively Evaluated for Impairment | 1,786,966 | 1,819,206 |
Recorded Investment in Loans, Total | 1,786,966 | 1,819,206 |
Commercial Real Estate [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 1,778 | 1,520 |
Allowance for Loan Losses, Total | 1,778 | 1,520 | 1,363
Recorded Investment in Loans, Collectively Evaluated for Impairment | 318,961 | 116,258 |
Recorded Investment in Loans, Total | 318,961 | 116,258 |
Home Equity Lines Of Credit [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment |  | 20 |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 310 | 142 |
Allowance for Loan Losses, Total | 310 | 162 | 371
Recorded Investment in Loans, Individually Evaluated for Impairment | 184 | 184 |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 37,914 | 14,855 |
Recorded Investment in Loans, Total | 38,098 | 15,039 |
Construction And Land [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 1,241 | 100 |
Allowance for Loan Losses, Total | 1,241 | 100 | 232
Recorded Investment in Loans, Collectively Evaluated for Impairment | 138,245 | 7,896 |
Recorded Investment in Loans, Total | 138,245 | 7,896 |
Other [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 1 | 2 |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 87 | 14 |
Allowance for Loan Losses, Total | 88 | 16 | 129
Recorded Investment in Loans, Individually Evaluated for Impairment | 21 | 2 |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 120,108 | 24,506 |
Recorded Investment in Loans, Total | 120,129 | 24,508 |
Qualitative [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 843 | 676 |
Allowance for Loan Losses, Total | $ 843 | $ 676 | $ 2,187

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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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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