Investment Securities, Trading (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Oct. 31, 2016
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Total investment securities, trading	$ 528,538		$ 413,541
Trading securities net unrealized loss		$ 11,600
Trading securities net unrealized gain	2,300
Short Term Debt Securities[Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Total investment securities, trading	68,915		85,822
Debt Securities [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Total investment securities, trading	253,954		191,688
Equity Securities [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Total investment securities, trading	$ 205,669		$ 136,031