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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 | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 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 | 94,620 | 87,397 |  |
Allowance for Loan Losses, Total | 102,802 | 95,579 | $ 88,172 | $ 85,833
Recorded Investment in Loans, Individually Evaluated for Impairment | 14,351 | 14,587 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 10,142,324 | 9,738,029 |  |
Recorded Investment in Loans, Total | 10,156,675 | 9,752,616 |  |
Commercial And Industrial [Member] |  |  |  |
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 | 51,804 | 61,791 |  |
Allowance for Loan Losses, Total | 59,962 | 69,949 | 68,566 | 68,367
Recorded Investment in Loans, Individually Evaluated for Impairment | 12,940 | 12,991 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 3,800,922 | 3,425,962 |  |
Recorded Investment in Loans, Total | 3,813,862 | 3,438,953 |  |
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 | 19,961 | 14,229 |  |
Allowance for Loan Losses, Total | 19,985 | 14,253 | 11,585 | 11,228
Recorded Investment in Loans, Individually Evaluated for Impairment | 1,411 | 1,412 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 3,493,725 | 3,308,136 |  |
Recorded Investment in Loans, Total | 3,495,136 | 3,309,548 |  |
Securities-Based Loans [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 2,915 | 2,361 |  |
Allowance for Loan Losses, Total | 2,915 | 2,361 | 2,227 | 1,978
Recorded Investment in Loans, Collectively Evaluated for Impairment | 1,945,371 | 2,098,211 |  |
Recorded Investment in Loans, Total | 1,945,371 | 2,098,211 |  |
Commercial Real Estate [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 8,165 | 3,564 |  |
Allowance for Loan Losses, Total | 8,165 | 3,564 | 2,421 | 1,778
Recorded Investment in Loans, Collectively Evaluated for Impairment | 399,732 | 428,549 |  |
Recorded Investment in Loans, Total | 399,732 | 428,549 |  |
Construction And Land [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 10,953 | 4,613 |  |
Allowance for Loan Losses, Total | 10,953 | 4,613 | 1,724 | 1,241
Recorded Investment in Loans, Collectively Evaluated for Impairment | 412,410 | 398,839 |  |
Recorded Investment in Loans, Total | 412,410 | 398,839 |  |
Home Equity Lines Of Credit [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 539 | 442 |  |
Allowance for Loan Losses, Total | 539 | 442 | 372 | 310
Recorded Investment in Loans, Individually Evaluated for Impairment |  | 184 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 57,402 | 51,021 |  |
Recorded Investment in Loans, Total | 57,402 | 51,205 |  |
Other [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 283 | 194 |  |
Allowance for Loan Losses, Total | 283 | 194 | 146 | 88
Recorded Investment in Loans, Collectively Evaluated for Impairment | 32,762 | 27,311 |  |
Recorded Investment in Loans, Total | $ 32,762 | 27,311 |  |
Unallocated [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment |  | 203 |  |
Allowance for Loan Losses, Total |  | $ 203 | $ 1,131 | $ 843

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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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- 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=118936363&loc=SL6953423-111524 + Details
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