Investment Securities, Trading (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Oct. 31, 2017
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Total investment securities, trading	$ 811,266		$ 708,376
Trading securities net unrealized gain	7,300	$ 2,300
Short Term Debt Securities[Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Total investment securities, trading	207,450		213,537
Debt Securities [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Total investment securities, trading	400,792		313,351
Equity Securities [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Total investment securities, trading	$ 203,024		$ 181,488