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Bank Loans (Activity In The Allowance For Loan Losses By Portfolio Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Beginning Balance | $ 99,196 | $ 115,821 | $ 112,029 | $ 95,579
CECL Adoption |  |  |  | (11,736)
Provision | (4,903) | (1,777) | (12,534) | 30,369
Charge-offs |  | (23) | (5,202) | (193)
Recoveries |  | 92 |  | 94
Ending Balance | 94,293 | 114,113 | 94,293 | 114,113
Commercial And Industrial |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Beginning Balance | 46,943 | 65,503 | 67,222 | 69,949
CECL Adoption |  |  |  | (19,940)
Provision | (256) | 10,303 | (15,333) | 25,949
Charge-offs |  | (1) | (5,202) | (153)
Recoveries |  | 4 |  | 4
Ending Balance | 46,687 | 75,809 | 46,687 | 75,809
Residential Mortgage |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Beginning Balance | 21,267 | 24,043 | 16,300 | 14,253
CECL Adoption |  |  |  | 3,499
Provision | 2,637 | (6,360) | 7,604 | (69)
Ending Balance | 23,904 | 17,683 | 23,904 | 17,683
Securities-Based Loans [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Beginning Balance | 2,519 | 1,807 | 2,015 | 2,361
CECL Adoption |  |  |  | 1,346
Provision | 808 | 95 | 1,312 | (1,805)
Ending Balance | 3,327 | 1,902 | 3,327 | 1,902
Commercial Real Estate [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Beginning Balance | 11,903 | 10,647 | 8,580 | 3,564
CECL Adoption |  |  |  | 791
Provision | (6,582) | (2,730) | (3,259) | 3,562
Ending Balance | 5,321 | 7,917 | 5,321 | 7,917
Construction And Land [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Beginning Balance | 15,953 | 13,075 | 17,275 | 4,613
CECL Adoption |  |  |  | 2,674
Provision | (1,620) | (2,889) | (2,942) | 2,899
Ending Balance | 14,333 | 10,186 | 14,333 | 10,186
Home Equity Lines Of Credit [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Beginning Balance | 426 | 499 | 374 | 442
CECL Adoption |  |  |  | 39
Provision | 48 | (205) | 100 | (188)
Recoveries |  | 87 |  | 88
Ending Balance | 474 | 381 | 474 | 381
Other [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Beginning Balance | 185 | 247 | 263 | 397
CECL Adoption |  |  |  | (145)
Provision | 62 | 9 | (16) | 21
Charge-offs |  | (22) |  | (40)
Recoveries |  | 1 |  | 2
Ending Balance | $ 247 | $ 235 | $ 247 | $ 235

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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=123577603&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=123577603&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://www.xbrl.org/2009/role/commonPracticeRef -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=122038336&loc=d3e74567-122707 Reference 2: 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=123577603&loc=SL6953423-111524 Reference 3: 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 4: 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=123577603&loc=SL6953423-111524 + Details
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