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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | $ 8,182 | $ 8,703 |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 87,397 | 77,130 |
Allowance for Loan Losses, Total | 95,579 | 85,833 | $ 67,466
Recorded Investment in Loans, Individually Evaluated for Impairment | 14,587 | 24,401 |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 9,738,029 | 8,557,246 |
Recorded Investment in Loans, Total | 9,752,616 | 8,581,647 |
Commercial And Industrial [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 8,158 | 8,678 |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 61,791 | 59,689 |
Allowance for Loan Losses, Total | 69,949 | 68,367 | 54,474
Recorded Investment in Loans, Individually Evaluated for Impairment | 12,991 | 23,677 |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 3,425,962 | 3,280,557 |
Recorded Investment in Loans, Total | 3,438,953 | 3,304,234 |
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 | 14,229 | 11,204 |
Allowance for Loan Losses, Total | 14,253 | 11,228 | 8,430
Recorded Investment in Loans, Individually Evaluated for Impairment | 1,412 | 519 |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 3,308,136 | 2,874,495 |
Recorded Investment in Loans, Total | 3,309,548 | 2,875,014 |
Securities-Based Loans [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 2,361 | 1,978 |
Allowance for Loan Losses, Total | 2,361 | 1,978 | 2,088
Recorded Investment in Loans, Collectively Evaluated for Impairment | 2,098,211 | 1,786,966 |
Recorded Investment in Loans, Total | 2,098,211 | 1,786,966 |
Commercial Real Estate [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 3,564 | 1,778 |
Allowance for Loan Losses, Total | 3,564 | 1,778 | 1,520
Recorded Investment in Loans, Collectively Evaluated for Impairment | 428,549 | 318,961 |
Recorded Investment in Loans, Total | 428,549 | 318,961 |
Construction And Land [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 4,613 | 1,241 |
Allowance for Loan Losses, Total | 4,613 | 1,241 | 100
Recorded Investment in Loans, Collectively Evaluated for Impairment | 398,839 | 138,245 |
Recorded Investment in Loans, Total | 398,839 | 138,245 |
Home Equity Lines Of Credit [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 442 | 310 |
Allowance for Loan Losses, Total | 442 | 310 | 162
Recorded Investment in Loans, Individually Evaluated for Impairment | 184 | 184 |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 51,021 | 37,914 |
Recorded Investment in Loans, Total | 51,205 | 38,098 |
Other [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment |  | 1 |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 194 | 87 |
Allowance for Loan Losses, Total | 194 | 88 | 16
Recorded Investment in Loans, Individually Evaluated for Impairment |  | 21 |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 27,311 | 120,108 |
Recorded Investment in Loans, Total | 27,311 | 120,129 |
Qualitative [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 203 | 843 |
Allowance for Loan Losses, Total | $ 203 | $ 843 | $ 676

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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=118936363&loc=SL6953423-111524 + Details
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