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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 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | $ 8,182 | $ 8,182 |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 103,847 | 87,397 |
Allowance for Loan Losses, Total | 112,029 | 95,579 | $ 85,833
Recorded Investment in Loans, Individually Evaluated for Impairment | 13,802 | 14,587 |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 11,157,011 | 9,738,029 |
Recorded Investment in Loans, Total | 11,170,813 | 9,752,616 |
Commercial And Industrial |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 8,158 | 8,158 |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 59,064 | 61,791 |
Allowance for Loan Losses, Total | 67,222 | 69,949 | 68,367
Recorded Investment in Loans, Individually Evaluated for Impairment | 12,251 | 12,991 |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 4,283,838 | 3,425,962 |
Recorded Investment in Loans, Total | 4,296,089 | 3,438,953 |
Residential Mortgage |  |  |
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 | 16,276 | 14,229 |
Allowance for Loan Losses, Total | 16,300 | 14,253 | 11,228
Recorded Investment in Loans, Individually Evaluated for Impairment | 1,407 | 1,412 |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 3,955,263 | 3,308,136 |
Recorded Investment in Loans, Total | 3,956,670 | 3,309,548 |
Securities-Based Loans [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 2,015 | 2,361 |
Allowance for Loan Losses, Total | 2,015 | 2,361 | 1,978
Recorded Investment in Loans, Collectively Evaluated for Impairment | 1,933,974 | 2,098,211 |
Recorded Investment in Loans, Total | 1,933,974 | 2,098,211 |
Commercial Real Estate [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 8,580 | 3,564 |
Allowance for Loan Losses, Total | 8,580 | 3,564 | 1,778
Recorded Investment in Loans, Individually Evaluated for Impairment | 144 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 366,341 | 428,549 |
Recorded Investment in Loans, Total | 366,485 | 428,549 |
Construction And Land [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 17,275 | 4,613 |
Allowance for Loan Losses, Total | 17,275 | 4,613 | 1,241
Recorded Investment in Loans, Collectively Evaluated for Impairment | 501,681 | 398,839 |
Recorded Investment in Loans, Total | 501,681 | 398,839 |
Home Equity Lines Of Credit [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 374 | 442 |
Allowance for Loan Losses, Total | 374 | 442 | 310
Recorded Investment in Loans, Individually Evaluated for Impairment |  | 184 |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 75,507 | 51,021 |
Recorded Investment in Loans, Total | 75,507 | 51,205 |
Other [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 263 | 397 |
Allowance for Loan Losses, Total | 263 | 397 | $ 931
Recorded Investment in Loans, Collectively Evaluated for Impairment | 40,407 | 27,311 |
Recorded Investment in Loans, Total | $ 40,407 | $ 27,311 |

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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=121611835&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=121611835&loc=SL6953423-111524 + Details
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