Bank Deposits (Scheduled Maturities Of Certificates Of Deposit) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Scheduled Maturities Of Certificates Of Deposit [Line Items]
Within one year	$ 10,149	$ 26,769
One to three years	4,209	6,874
Three to five years	617	1,268
Certificates of deposit, less than $100	14,975	34,911
Within one year	13,194	33,784
One to three years	3,817	7,520
Three to five years	873	723
Over five years		259
Certificates of deposit, $100 and greater	17,884	42,286
Total certificates of deposit	32,859	77,197
Brokerage Customers Deposits [Member]
Scheduled Maturities Of Certificates Of Deposit [Line Items]
Deposits of related parties	4,800,000	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