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Bank Loans (Activity in the Allowance for Loan Losses by Portfolio Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Beginning Balance | $ 130,213 | $ 117,162 | $ 128,292 | $ 111,653
Provision | 6,832 | 6,117 | 11,390 | 11,493
Charge-offs | (1,931) | (598) | (5,501) | (618)
Recoveries |  |  | 933 | 153
Ending Balance | 135,114 | 122,681 | 135,114 | 122,681
Commercial and Industrial [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Beginning Balance | 65,887 | 55,734 | 67,077 | 54,143
Provision | 10,708 | 11,241 | 12,155 | 12,699
Charge-offs | (241) | (598) | (3,811) | (618)
Recoveries |  |  | 933 | 153
Ending Balance | 76,354 | 66,377 | 76,354 | 66,377
Construction And Land [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Beginning Balance | 18,589 | 10,317 | 11,817 | 8,568
Provision | (2,210) | 2,328 | 4,562 | 4,077
Ending Balance | 16,379 | 12,645 | 16,379 | 12,645
Commercial Real Estate [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Beginning Balance | 20,689 | 11,566 | 21,386 | 12,897
Provision | (3,687) | 1,863 | (4,384) | 532
Charge-offs | (1,690) |  | (1,690) |
Ending Balance | 15,312 | 13,429 | 15,312 | 13,429
Fund Banking [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Beginning Balance | 8,763 | 12,943 | 10,173 | 11,711
Provision | 3,416 | (765) | 2,006 | 467
Ending Balance | 12,179 | 12,178 | 12,179 | 12,178
Residential Real Estate [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Beginning Balance | 12,507 | 22,696 | 13,855 | 20,441
Provision | (1,265) | (8,283) | (2,613) | (6,028)
Ending Balance | 11,242 | 14,413 | 11,242 | 14,413
Securities-Based Loans [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Beginning Balance | 3,068 | 3,117 | 3,035 | 3,157
Provision | (255) | (31) | (222) | (71)
Ending Balance | 2,813 | 3,086 | 2,813 | 3,086
Home Equity Lines Of Credit [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Beginning Balance | 246 | 412 | 371 | 364
Provision | 116 | (244) | (9) | (196)
Ending Balance | 362 | 168 | 362 | 168
Other [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Beginning Balance | 464 | 377 | 578 | 372
Provision | 9 | 8 | (105) | 13
Ending Balance | $ 473 | $ 385 | $ 473 | $ 385

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