Bank Deposits (Scheduled Maturities Of Certificates Of Deposit) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Scheduled Maturities Of Certificates Of Deposit [Line Items]
Within one year	$ 1,674	$ 4,863
One to three years	969	2,356
Three to five years		145
Certificates of deposit, less than $100	2,643	7,364
Within one year	1,372	5,464
One to three years	647	1,975
Three to five years	301	284
Certificates of deposit, $100 and greater	2,320	7,723
Total certificates of deposit	4,963	15,087
Brokerage Customers Deposits [Member]
Scheduled Maturities Of Certificates Of Deposit [Line Items]
Deposits of related parties	9,900,000	6,600,000
Stifel Nicolaus [Member]
Scheduled Maturities Of Certificates Of Deposit [Line Items]
Interest bearing and time deposits of executive officers, directors, and affiliates	$ 200	$ 300