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Bank Loans (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Mortgage loans held for sale | $ 465,739 |  | $ 465,739 |  | $ 423,999
Accrued interest receivable | $ 100,900 |  | $ 100,900 |  | $ 94,000
Collateralized loan portfolio | 96.80% |  | 96.80% |  | 97.00%
Residential Real Estate [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Mortgage loans held for sale | $ 465,700 |  | $ 465,700 |  | $ 424,000
Federal Reserve Discount Window [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans pledged as collateral | 2,300,000 |  | 2,300,000 |  |
Residential Real Estate [Member] | Asset Pledged as Collateral [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans pledged as collateral | 7,800,000 |  | 7,800,000 |  | 7,400,000
Other Income [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gains (losses) recognized from sale of loans | (100) | $ (200) | (3,000) | $ (2,800) |
Accounting Standards Update 2016-13 [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for credit losses | 9,200 | 13,400 | 20,600 | 24,900 |
Credit Loss Reserves Net | 5,300 | 10,000 | 13,500 | 22,700 |
Accounting Standards Update 2016-13 [Member] | Unfunded Commitment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowances for unfunded credit commitments | 3,900 |  | 7,400 |  |
Allowance For Unfunded Credit Commitment |  | $ 3,400 |  | $ 2,200 |
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 | $ 41,800 |  | $ 41,800 |  | $ 46,000

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