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Bank Loans (Activity In The Allowance For Loan Losses By Portfolio Segment) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Beginning Balance | $ 95,579 | $ 85,833
CECL Adoption | (11,736) |
Provision | 28,264 | 9,977
Charge-offs | (193) | (386)
Recoveries | 115 | 155
Ending Balance | 112,029 | 95,579
Commercial And Industrial |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Beginning Balance | 69,949 | 68,367
CECL Adoption | (19,940) |
Provision | 17,341 | 1,821
Charge-offs | (153) | (239)
Recoveries | 25 |
Ending Balance | 67,222 | 69,949
Residential Mortgage |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Beginning Balance | 14,253 | 11,228
CECL Adoption | 3,499 |
Provision | (1,452) | 2,974
Charge-offs |  | (41)
Recoveries |  | 92
Ending Balance | 16,300 | 14,253
Securities-Based Loans [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Beginning Balance | 2,361 | 1,978
CECL Adoption | 1,346 |
Provision | (1,692) | 383
Ending Balance | 2,015 | 2,361
Commercial Real Estate [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Beginning Balance | 3,564 | 1,778
CECL Adoption | 791 |
Provision | 4,225 | 1,786
Ending Balance | 8,580 | 3,564
Construction And Land [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Beginning Balance | 4,613 | 1,241
CECL Adoption | 2,674 |
Provision | 9,988 | 3,372
Ending Balance | 17,275 | 4,613
Home Equity Lines Of Credit [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Beginning Balance | 442 | 310
CECL Adoption | 39 |
Provision | (195) | 129
Recoveries | 88 | 3
Ending Balance | 374 | 442
Other [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Beginning Balance | 397 | 931
CECL Adoption | (145) |
Provision | 49 | (488)
Charge-offs | (40) | (106)
Recoveries | 2 | 60
Ending Balance | $ 263 | $ 397

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- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + 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 (c)(4) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + 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 (c)(3) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
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