Bank Loans (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans held for sale	$ 288,676		$ 288,676		$ 207,715
Gains (losses) recognized from sale of loans	(100)	$ 7,500	600	$ 21,400
Accrued interest receivable	39,100		39,100		27,400
Loans Pledged as Collateral	19,331		19,331		23,432
Provision for credit losses	3,318	(4,204)	8,172	(7,631)
Impaired loans more than 90 days past due					17,300
Troubled debt restructurings	$ 200		$ 200		200
Specific allowance					$ 200
Collateralized loan portfolio	97.40%		97.40%		98.50%
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans held for sale	$ 288,700		$ 288,700		$ 207,700
Unfunded Commitment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for credit losses	9,500		12,900
Residential Real Estate [Member] | Asset Pledged as Collateral [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	6,000		6,000		4,900,000
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Pledged as Collateral					1
Provision for credit losses	2,803	$ (1,157)	2,549	$ 3,323
Stifel Bancorp [Member] | Executive Officers and Directors [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans outstanding amount	26,800		26,800		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	$ 26,800		$ 26,800		$ 27,200