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Benefit Plans - Additional Information (Details) |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 24, 2020 shares | May 08, 2020 USD ($) shares | Oct. 31, 2020 USD ($) $ / shares shares | Oct. 31, 2019 USD ($) shares | Oct. 31, 2018 USD ($) $ / shares shares | Aug. 26, 2022 shares | May 11, 2020 shares | Aug. 26, 2019 shares | May 08, 2019 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  | 337,500,000 | 225,000,000 |  |  | 112,500,000 |  | 225,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Description |  |  | Performance awards were issued assuming participants achieve 100% target performance. Should participants achieve the 200% performance level, they will receive up to 668,030 additional RSUs. |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date | Oct. 31, 2022 |  |  |  |  |  |  |  |
Share Based Compensation Arrangement by Share-Based Payment Award, Rate of Vesting | 0.333 |  |  |  |  |  |  |  |
Options granted |  |  | 0 | 0 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares |  |  |  |  | $ 21.36 |  |  |  |
Options exercised |  |  | 0 | 0 | 0 |  |  |  |
Intrinsic value, options outstanding | $ |  |  | $ 0 |  |  |  |  |  |
Intrinsic value, options exercisable | $ |  |  | $ 0 |  |  |  |  |  |
Restricted Stock Awards and Units, Granted, Shares |  |  | 1,978,108 |  |  |  |  |  |
Stock Issued During Period, Shares, Issued for Services |  |  | 58,303 | 29,454 | 13,226 |  |  |  |
Noninterest Expense Directors Fees | $ |  |  | $ 100,000 | $ 100,000 | $ 300,000 |  |  |  |
ESOP, period for which sale of shares is restricted |  |  | 6 months |  |  |  |  |  |
Employer Matching Contribution Percentage |  |  | 2.00% |  |  |  |  |  |
Defined Contribution Plan, Cost Recognized | $ |  |  | $ 300,000 | $ 500,000 | $ 500,000 |  |  |  |
Restricted Stock Awards and Units [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Restricted Stock or Unit Expense | $ |  |  | $ 5,300,000 |  |  |  |  |  |
Restricted Stock or Unit Expense weighted average period |  |  | 2 years |  |  |  |  |  |
Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date |  |  | Aug. 26, 2022 |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, options, vested and expected to vest, outstanding, number |  |  |  |  |  | 500,000 |  |  |
Restricted Stock Units [Member] | President and Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Restricted Stock Awards and Units, Granted, Shares |  |  | 1,000,000 |  |  |  |  |  |
Performance Shares [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Additional shares issued upon performance |  |  | 668,030 |  |  |  |  |  |
Performance shares expensed period |  |  | 3 years |  |  |  |  |  |
TSR Performance Shares [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Additional shares issued upon performance |  |  | 334,015 |  |  |  |  |  |
Performance awards valued per share | $ / shares |  |  | $ 4.62 |  |  |  |  |  |
Time Based Awards |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Additional shares issued upon performance |  |  | 167,008 |  |  |  |  |  |
Absolute Performance Shares |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Additional shares issued upon performance |  |  | 334,015 |  |  |  |  |  |
Performance awards valued per share | $ / shares |  |  | $ 5.17 |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Restricted stock awards, general vesting period |  |  | 3 years |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Restricted stock awards, general vesting period |  |  | 4 years |  |  |  |  |  |
Maximum [Member] | Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares reserved for future issuance and sale |  |  |  |  | 30,248 |  |  |  |
2018 Omnibus Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  | 4,000,000 |  |  |  |  |  | 4,333,333 |
Number of shares reserved for future issuance and sale |  |  |  |  |  |  |  | 1,000,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  | 2,013,563 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Description | The LTI Plan consists of three award components: (1) relative total shareholder return (“TSR”) performance shares, (2) absolute TSR performance shares, and (3) time-vesting restricted stock units |  |  |  |  |  |  |  |
2018 Omnibus Incentive Plan [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Award Options, Grant In Period, Grant Date Increase In Fair Value | $ |  | $ 200,000 |  |  |  |  |  |  |
2018 Omnibus Incentive Plan [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Award Options, Grant In Period, Grant Date Increase In Fair Value | $ |  | $ 250,000 |  |  |  |  |  |  |
LTI Plan [Member] | Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Restricted Stock Awards and Units, Granted, Shares | 835,038 |  |  |  |  |  |  |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock Issuance Terms |  |  | 85.00% |  |  |  |  |  |

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