Bank Deposits (Scheduled Maturities Of Certificates Of Deposit) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Scheduled Maturities Of Certificates Of Deposit [Line Items]
Within one year	$ 7,597	$ 26,769
One to three years	2,614	6,874
Three to five years	332	1,268
Certificates of deposit, less than $100	10,543	34,911
Within one year	11,139	33,784
One to three years	1,733	7,520
Three to five years	783	723
Over five years		259
Certificates of deposit, $100 and greater	13,655	42,286
Total certificates of deposit	24,198	77,197
Brokerage Customers Deposits [Member]
Scheduled Maturities Of Certificates Of Deposit [Line Items]
Deposits of related parties	4,100,000	4,700,000
Stifel Nicolaus [Member]
Scheduled Maturities Of Certificates Of Deposit [Line Items]
Interest bearing and time deposits of executive officers, directors, and affiliates	$ 200	$ 300