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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, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 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 | 105,931 |  | 87,397 |  |  |
Allowance for Loan Losses, Total | 114,113 | $ 115,821 | 95,579 | $ 91,360 | $ 90,472 | $ 85,833
Recorded Investment in Loans, Individually Evaluated for Impairment | 14,493 |  | 14,587 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 10,739,195 |  | 9,738,029 |  |  |
Recorded Investment in Loans, Total | 10,753,688 |  | 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 | 67,651 |  | 61,791 |  |  |
Allowance for Loan Losses, Total | 75,809 | 65,503 | 69,949 | 68,172 | 69,263 | 68,367
Recorded Investment in Loans, Individually Evaluated for Impairment | 13,084 |  | 12,991 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 4,067,855 |  | 3,425,962 |  |  |
Recorded Investment in Loans, Total | 4,080,939 |  | 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 | 17,659 |  | 14,229 |  |  |
Allowance for Loan Losses, Total | 17,683 | 24,043 | 14,253 | 12,562 | 12,042 | 11,228
Recorded Investment in Loans, Individually Evaluated for Impairment | 1,409 |  | 1,412 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 3,803,427 |  | 3,308,136 |  |  |
Recorded Investment in Loans, Total | 3,804,836 |  | 3,309,548 |  |  |
Securities-Based Loans [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 1,902 |  | 2,361 |  |  |
Allowance for Loan Losses, Total | 1,902 | 1,807 | 2,361 | 2,181 | 2,311 | 1,978
Recorded Investment in Loans, Collectively Evaluated for Impairment | 1,841,516 |  | 2,098,211 |  |  |
Recorded Investment in Loans, Total | 1,841,516 |  | 2,098,211 |  |  |
Commercial Real Estate [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 7,917 |  | 3,564 |  |  |
Allowance for Loan Losses, Total | 7,917 | 10,647 | 3,564 | 2,903 | 2,478 | 1,778
Recorded Investment in Loans, Collectively Evaluated for Impairment | 386,957 |  | 428,549 |  |  |
Recorded Investment in Loans, Total | 386,957 |  | 428,549 |  |  |
Construction And Land [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 10,186 |  | 4,613 |  |  |
Allowance for Loan Losses, Total | 10,186 | 13,075 | 4,613 | 3,267 | 2,402 | 1,241
Recorded Investment in Loans, Collectively Evaluated for Impairment | 532,319 |  | 398,839 |  |  |
Recorded Investment in Loans, Total | 532,319 |  | 398,839 |  |  |
Home Equity Lines Of Credit [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 381 |  | 442 |  |  |
Allowance for Loan Losses, Total | 381 | 499 | 442 | 435 | 421 | 310
Recorded Investment in Loans, Individually Evaluated for Impairment |  |  | 184 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 67,386 |  | 51,021 |  |  |
Recorded Investment in Loans, Total | 67,386 |  | 51,205 |  |  |
Other [Member] |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 235 |  | 194 |  |  |
Allowance for Loan Losses, Total | 235 | $ 247 | 194 | 195 | 179 | 88
Recorded Investment in Loans, Collectively Evaluated for Impairment | 39,735 |  | 27,311 |  |  |
Recorded Investment in Loans, Total | $ 39,735 |  | 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 | $ 1,645 | $ 1,376 | $ 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=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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