Bank Deposits (Scheduled Maturities Of Certificates Of Deposit) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Scheduled Maturities Of Certificates Of Deposit [Line Items]
Within one year	$ 4,863	$ 26,769
One to three years	2,356	6,874
Three to five years	145	1,268
Certificates of deposit, less than $100	7,364	34,911
Within one year	5,464	33,784
One to three years	1,975	7,520
Three to five years	284	723
Over five years		259
Certificates of deposit, $100 and greater	7,723	42,286
Total certificates of deposit	15,087	77,197
Brokerage Customers Deposits [Member]
Scheduled Maturities Of Certificates Of Deposit [Line Items]
Deposits of related parties	6,600,000	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	$ 300	$ 300