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Bank Loans (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Mortgage loans held for sale | $ 423,999 | $ 156,912 |
Gains (losses) recognized from sale of loans |  |  | $ 29,800
Accrued interest receivable | 94,000 | 65,700 |
Impaired loans more than 90 days past due | 45,500 | 10,300 |
Troubled debt restructurings | 100 | 200 |
Specific allowance | $ 5,000 | $ 6,500 |
Collateralized loan portfolio | 97.00% | 97.50% |
ASU 2016-13 [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Credit Loss Reserves Net | $ 25,000 | $ 33,500 |
Allowance for credit losses | 25,600 | 16,500 |
Uncollectible broker notes | 2,300 |  |
Residential Real Estate [Member] | Asset Pledged as Collateral [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans pledged as collateral | 7,400,000 | 7,000,000 |
Other Income |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gains (losses) recognized from sale of loans | 1,200 | 7,800 |
Residential Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Mortgage loans held for sale | 424,000 | 156,900 |
Unfunded Commitment [Member] | ASU 2016-13 [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Reserve For Unfunded Commitments For Credit Loss | 2,900 | 17,000 |
Stifel Bancorp [Member] | Executive Officers and Directors of Certain Affiliated Entities [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans outstanding amount | $ 46,000 | $ 86,400 |

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