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 | ||