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Bank Loans (Activity in Allowance for Loan Losses by Portfolio Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Beginning Balance | $ 122,681 | $ 107,482 | $ 111,653 | $ 99,344
Provision | 13,418 | 1,550 | 24,911 | 9,722
Charge-offs | (302) | (4,008) | (920) | (4,044)
Recoveries | 0 | 0 | 153 | 2
Ending Balance | 135,797 | 105,024 | 135,797 | 105,024
Commercial and Industrial [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Beginning Balance | 66,377 | 57,594 | 54,143 | 44,661
Provision | 8,584 | (1,511) | 21,283 | 11,420
Charge-offs | (302) | (4,008) | (920) | (4,008)
Recoveries | 0 | 0 | 153 | 2
Ending Balance | 74,659 | 52,075 | 74,659 | 52,075
Commercial Real Estate [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Beginning Balance | 13,429 | 6,483 | 12,897 | 3,934
Provision | 6,437 | 5,480 | 6,969 | 8,029
Charge-offs | 0 |  | 0 |
Recoveries | 0 |  | 0 |
Ending Balance | 19,866 | 11,963 | 19,866 | 11,963
Residential Real Estate [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Beginning Balance | 14,413 | 22,615 | 20,441 | 28,560
Provision | 194 | (5,150) | (5,834) | (11,095)
Charge-offs | 0 |  | 0 |
Recoveries | 0 |  | 0 |
Ending Balance | 14,607 | 17,465 | 14,607 | 17,465
Fund Banking [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Beginning Balance | 12,178 | 9,758 | 11,711 | 8,868
Provision | (660) | 2,414 | (193) | 3,304
Charge-offs | 0 |  | 0 |
Recoveries | 0 |  | 0 |
Ending Balance | 11,518 | 12,172 | 11,518 | 12,172
Construction and Land [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Beginning Balance | 12,645 | 5,854 | 8,568 | 8,536
Provision | (1,145) | 1,675 | 2,932 | (1,007)
Charge-offs | 0 |  | 0 |
Recoveries | 0 |  | 0 |
Ending Balance | 11,500 | 7,529 | 11,500 | 7,529
Securities-Based Loans [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Beginning Balance | 3,086 | 3,976 | 3,157 | 4,006
Provision | (68) | (658) | (139) | (652)
Charge-offs | 0 |  | 0 | (36)
Recoveries | 0 |  | 0 |
Ending Balance | 3,018 | 3,318 | 3,018 | 3,318
Home Equity Lines of Credit [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Beginning Balance | 168 | 922 | 364 | 511
Provision | 27 | (724) | (169) | (313)
Charge-offs | 0 |  | 0 |
Recoveries | 0 |  | 0 |
Ending Balance | 195 | 198 | 195 | 198
Other [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Beginning Balance | 385 | 280 | 372 | 268
Provision | 49 | 24 | 62 | 36
Charge-offs | 0 |  | 0 |
Recoveries | 0 |  | 0 |
Ending Balance | $ 434 | $ 304 | $ 434 | $ 304

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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 -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (c)(4) -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B + 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 -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (c)(3) -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B + 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 -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481696/310-30-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (c)(1) -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (g) -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480418/310-10-S99-4 + Details
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