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Benefit Plans - Additional Information (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Jul. 31, 2017 | Apr. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Stock Issued During Period, Shares, Issued for Services | 86,000 |
Noninterest Expense Directors Fees | $ 0.1 |
Restricted Stock Awards and Units [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Share-based compensation arrangement by share-based payment award, non-option equity instruments, granted | 2,600,000 |
Share-based compensation arrangement by share-based payment award, non-option equity instruments, outstanding, number | 3,100,000 |
Restricted Stock Awards and Units [Member] | Minimum [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Restricted stock awards, general vesting period | 3 years |
Restricted Stock Awards and Units [Member] | Maximum [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Restricted stock awards, general vesting period | 4 years |
2010 Equity Incentive plan [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Common Stock, Capital Shares Reserved for Future Issuance |  | 4,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 200,000 |

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