Bank Loans (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans outstanding amount			$ 27,200,000
Mortgage loans held for sale	$ 315,427,000		207,715,000
Gains (losses) recognized from sale of loans	700,000	$ 13,900
Accrued interest receivable	32,100		27,400,000
Provision for credit losses	(4,854,000)	(3,427,000)
Impaired loans more than 90 days past due	17,000,000.0		17,300,000
Troubled debt restructurings	200,000		200,000
Specific allowance	$ 6,200,000		$ 200,000
Collateralized loan portfolio	97.60%		98.50%
Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans held for sale	$ 315,400,000		$ 207,700,000
Unfunded Commitment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for credit losses	3,400,000	1,800,000
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	5,400,000,000		$ 4,900
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for credit losses	(254,000)	$ (4,480,000)
Stifel Bancorp [Member] | Executive Officers and Directors [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans outstanding amount	$ 27,100,000