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Benefit Plans - Additional Information (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Jul. 31, 2018 | Apr. 05, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Restricted stock units, granted, shares | 2,400,000 |
Share-based compensation arrangement by share-based payment award, non-option equity instruments, outstanding, number | 4,400,000 |
Stock Issued During Period, Shares, Issued for Services | 158,708 |
Noninterest Expense Directors Fees | $ 0.3 |
Maximum [Member] | Employee Stock Purchase Plan [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Common Stock, Capital Shares Reserved for Future Issuance |  | 500,000
Restricted Stock Units (RSUs) [Member] | Minimum [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Restricted stock units, general vesting period | 3 years |
Restricted Stock Units (RSUs) [Member] | Maximum [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Restricted stock units, general vesting period | 4 years |
2018 Omnibus Incentive Plan [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Common Stock, Capital Shares Reserved for Future Issuance |  | 4,000,000

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