Bank Deposits (Scheduled Maturities Of Certificates Of Deposit) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Scheduled Maturities Of Certificates Of Deposit [Line Items]
Within one year	$ 3,980	$ 4,863
One to three years	1,968	2,356
Three to five years		145
Certificates of deposit, less than $100	5,948	7,364
Within one year	3,922	5,464
One to three years	1,829	1,975
Three to five years	291	284
Certificates of deposit, $100 and greater	6,042	7,723
Total certificates of deposit	11,990	15,087
Brokerage Customers Deposits [Member]
Scheduled Maturities Of Certificates Of Deposit [Line Items]
Deposits of related parties	7,200,000	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	$ 300	$ 300