Investment Securities, Trading (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016	Oct. 31, 2016
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Total investment securities, trading	$ 579,439		$ 579,439		$ 413,541
Trading securities net unrealized gain	6,300	$ 17,600	8,600	$ 6,000
Short Term Debt Securities[Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Total investment securities, trading	66,591		66,591		85,822
Debt Securities [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Total investment securities, trading	299,248		299,248		191,688
Equity Securities [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Total investment securities, trading	$ 213,600		$ 213,600		$ 136,031