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Bank Loans (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Dec. 21, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Mortgage loans held for sale | $ 595,517 |  | $ 595,517 |  | $ 578,980 |
Accrued interest receivable | 90,800 |  | 90,800 |  |  | $ 92,600
Provision for credit losses | $ 8,316 | $ 5,287 | $ 28,664 | $ 13,509 |  |
Collateralized loan portfolio | 971.00% |  | 971.00% |  | 968.00% |
Residential Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Mortgage loans held for sale | $ 595,500 |  | $ 595,500 |  | $ 579,000 |
Federal Reserve Discount Window [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans pledged as collateral | 2,800,000 |  | 2,800,000 |  | 2,500,000 |
Residential Real Estate [Member] | Asset Pledged as Collateral [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans pledged as collateral | 8,400,000 |  | 8,400,000 |  | 7,900,000 |
Other Income [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gains (losses) recognized from sale of loans | (1,600) | (100) | (6,500) | (3,000) |  |
Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for credit losses | 8,800 | 9,200 | 29,200 | 20,600 |  |
Provision for credit losses | 8,300 | 5,300 | 28,700 | 13,500 |  |
Accounting Standards Update 2016-13 [Member] | Unfunded Commitment [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for credit losses on unfunded lending commitments | 500 | $ 3,900 | 600 | 7,400 |  |
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 | $ 52,900 |  | $ 52,900 |  | $ 39,600 |

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