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Bank Loans (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024 | Dec. 21, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Mortgage loans held for sale | $ 800,766 |  | $ 800,766 |  | $ 578,980 |
Accrued interest receivable | $ 90,600 |  | $ 90,600 |  |  | $ 92,600
Collateralized loan portfolio | 969.00% |  | 969.00% |  | 968.00% |
Residential Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Mortgage loans held for sale | $ 800,800 |  | $ 800,800 |  | $ 579,000 |
Federal Reserve Discount Window [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans pledged as collateral | 2,600,000 |  | 2,600,000 |  | 2,500,000 |
Residential Real Estate [Member] | Asset Pledged as Collateral [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans pledged as collateral | 8,200,000 |  | 8,200,000 |  | 7,900,000 |
Other Income [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gains (losses) recognized from sale of loans | (4,200) | $ (1,500) | (4,800) | $ (2,900) |  |
Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for credit losses | 7,900 | 6,800 | 20,400 | 11,400 |  |
Credit loss reserves net | 8,300 | 3,000 | 20,300 | 8,200 |  |
Accounting Standards Update 2016-13 [Member] | Unfunded Commitment [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowances for unfunded credit commitments | 400 | $ 3,900 | 100 | 3,500 |  |
Accounting Standards Update 2016-13 [Member] | Employee Retention Awards [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Credit loss reserves net |  |  |  | $ 300 |  |
Stifel Bancorp [Member] | Executive Officers and Directors of Certain Affiliated Entities [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans outstanding amount | $ 47,600 |  | $ 47,600 |  | $ 39,600 |

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