Bank Loans (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans held for sale	$ 156,912	$ 207,715
Gains (losses) recognized from sale of loans		29,800	$ 41,200
Proceeds from unpaid principal balance of loans		208,000
Accrued interest receivable	65,700	27,400
Impaired loans more than 90 days past due	10,300	17,300
Troubled debt restructurings	200	200
Specific allowance	$ 6,500	$ 6,200
Collateralized loan portfolio	97.50%	98.50%
ASU 2016-13 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit Loss Reserves Net	$ 33,500	$ 11,500
Allowance for credit losses	16,500	7,500
Residential Real Estate [Member] | Asset Pledged as Collateral [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	7,000,000	4,900,000
Other Income
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gains (losses) recognized from sale of loans	7,800	2,500
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans held for sale	156,900	207,700
Unfunded Commitment [Member] | ASU 2016-13 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reserve For Unfunded Commitments For Credit Loss	17,000	4,000
Stifel Bancorp [Member] | Executive Officers and Directors [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans outstanding amount	86,400	27,200
Stifel Bancorp [Member] | Executive Officers and Directors of Certain Affiliated Entities [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans outstanding amount	$ 86,400	$ 27,200