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Bank Loans (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 21, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Mortgage loans held for sale | $ 534,593 |  | $ 423,999 |
Accrued interest receivable | 96,800 |  |  | $ 94,000
Provision for credit losses | 4,558 | $ 5,376 |  |
Impaired loans more than 90 days past due | 59,400 |  | 45,500 |
Troubled debt restructurings | 100 |  | 100 |
Specific allowance | $ 6,700 |  | $ 5,000 |
Collateralized loan portfolio | 96.90% |  | 97.00% |
ASU 2016-13 [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Credit Loss Reserves Net | $ 5,300 | 4,900 |  |
Allowance for credit losses | 4,600 | 5,400 |  |
ASU 2016-13 [Member] | Employee Retention Award |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Credit Loss Reserves Net | 300 |  |  |
Residential Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Mortgage loans held for sale | 534,600 |  | $ 424,000 |
Unfunded Commitment [Member] | ASU 2016-13 [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Reserve For Unfunded Commitments For Credit Loss | 400 | 500 |  |
Residential Real Estate [Member] | Asset Pledged as Collateral [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans pledged as collateral | 7,500,000 |  | 7,400,000 |
Commercial Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Provision for credit losses | (697) | (1,331) |  |
Other Income |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gains (losses) recognized from sale of loans | 1,400 | $ 600 |  |
Stifel Bancorp [Member] | Executive Officers and Directors of Certain Affiliated Entities [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans outstanding amount | $ 42,300 |  | $ 46,000 |

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