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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, 2024 | Dec. 31, 2023
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Beginning Balance | $ 128,292 | $ 111,653
Provision | 27,679 | 25,586
Charge-offs | (19,297) | (9,100)
Recoveries | 2,634 | 153
Ending Balance | 139,308 | 128,292
Commercial and Industrial [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Beginning Balance | 67,077 | 54,143
Provision | 35,369 | 21,881
Charge-offs | (10,688) | (9,100)
Recoveries | 940 | 153
Ending Balance | 92,698 | 67,077
Commercial Real Estate [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Beginning Balance | 21,386 | 12,897
Provision | (13,329) | 8,489
Charge-offs | (1,690) |
Recoveries | 1,690 |
Ending Balance | 8,057 | 21,386
Residential Real Estate [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Beginning Balance | 13,855 | 20,441
Provision | (2,794) | (6,586)
Ending Balance | 11,061 | 13,855
Construction And Land [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Beginning Balance | 11,817 | 8,568
Provision | 7,809 | 3,249
Charge-offs | (6,760) |
Ending Balance | 12,866 | 11,817
Fund Banking [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Beginning Balance | 10,173 | 11,711
Provision | 619 | (1,538)
Ending Balance | 10,792 | 10,173
Securities-Based Loans [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Beginning Balance | 3,035 | 3,157
Provision | (118) | (122)
Ending Balance | 2,917 | 3,035
Home Equity Lines Of Credit [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Beginning Balance | 371 | 364
Provision | (54) | 7
Ending Balance | 317 | 371
Other [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Beginning Balance | 578 | 372
Provision | 177 | 206
Charge-offs | (159) |
Recoveries | 4 |
Ending Balance | $ 600 | $ 578

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