Bank Deposits (Scheduled Maturities Of Certificates Of Deposit) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Scheduled Maturities Of Certificates Of Deposit [Line Items]
Within one year	$ 2,877	$ 4,863
One to three years	1,715	2,356
Three to five years		145
Certificates of deposit, less than $100	4,592	7,364
Within one year	3,031	5,464
One to three years	1,135	1,975
Three to five years	297	284
Certificates of deposit, $100 and greater	4,463	7,723
Total certificates of deposit	9,055	15,087
Brokerage Customers Deposits [Member]
Scheduled Maturities Of Certificates Of Deposit [Line Items]
Deposits of related parties	7,900,000	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