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Bank Loans (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Mortgage loans held for sale | $ 578,980,000 | $ 423,999,000 |
Accrued interest receivable | 92,600,000 | $ 94,000,000 |
Modifications of loans to borrowers experiencing financial difficulty | $ 116,600,000 |  |
Collateralized loan portfolio | 96.80% | 97.00% |
Residential Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Mortgage loans held for sale | $ 579,000,000 | $ 424,000,000 |
Federal Reserve Discount Window [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans pledged as collateral | 2,500,000,000 |  |
Residential Real Estate [Member] | Asset Pledged as Collateral [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans pledged as collateral | 7,900,000,000 | 7,400,000,000 |
Other Income [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gains (losses) recognized from sale of loans | 5,000,000 | 1,200,000 | $ 7,800,000
Accounting Standards Update 2016-13 [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for credit losses | 27,700,000 | 25,600,000 |
Uncollectible broker notes |  | 2,300,000 |
Credit loss reserves net | 25,400,000 | 25,000,000 |
Accounting Standards Update 2016-13 [Member] | Unfunded Commitment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowances for unfunded credit commitments | 2,600 |  |
Allowance for unfunded credit commitment |  | 2,900,000 |
Accounting Standards Update 2016-13 [Member] | Employee Retention Awards [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Credit loss reserves net | 300,000 |  |
Stifel Bancorp [Member] | Executive Officers and Directors of Certain Affiliated Entities [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans outstanding amount | $ 39,600,000 | $ 46,000,000 |

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