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Bank Loans (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Mortgage loans held for sale $ 265,330   $ 265,330   $ 205,557
Gains (losses) recognized from sale of loans 4,500 $ 2,600 7,700 $ 7,800  
Impaired loans more than 90 days past due 16,200   16,200   24,400
Troubled debt restructurings 200   200   9,100
Specific allowance $ 8,200   $ 8,200   $ 8,703
Collateralized loan portfolio 98.30%   98.30%   98.40%
Residential Real Estate [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Mortgage loans held for sale $ 265,300   $ 265,300   $ 205,600
Stifel Bancorp [Member] | Executive Officers and Directors [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans outstanding amount 26,300   26,300   28,800
Stifel Bancorp [Member] | Executive Officers and Directors of Certain Affiliated Entities [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans outstanding amount $ 26,300   $ 26,300   $ 28,800