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Benefit Plans - Additional Information (Details) - USD ($) |  | 12 Months Ended | 19 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 01, 2017 | Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2019 | Apr. 05, 2018 | Apr. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock, shares reserved for issuance |  |  |  |  |  |  | 4,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 4 years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  | 10 years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  | $ 21.36 | $ 18.00 |  |  |
Options exercised |  | 0 | 0 | 0 |  |  |
Intrinsic value, options outstanding |  | $ 0 |  |  | $ 0 |  |
Intrinsic value, options exercisable |  | $ 0 |  |  | $ 0 |  |
Share based compensation arrangement by share based payment award, non option equity instruments, outstanding, number |  | 191,115 | 364,215 |  | 191,115 |  |
Restricted Stock Awards, Weighted Average Remaining Life |  | 9 months 18 days |  |  |  |  |
Restricted Stock Awards Outstanding, Intrinsic Value |  | $ 45,500 |  |  | $ 45,500 |  |
Stock Issued During Period, Shares, Issued for Services |  | 29,454 | 13,226 | 7,167 |  |  |
Noninterest Expense Directors Fees |  | $ 100,000 | $ 300,000 | $ 100,000 |  |  |
ESOP, period for which sale of shares is restricted |  | 6 months |  |  |  |  |
Employer Matching Contribution Percentage |  | 2.00% |  |  |  |  |
Defined Contribution Plan, Cost Recognized |  | $ 500,000 | $ 500,000 | $ 500,000 |  |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Employee stock purchase plan, suspended date | May 01, 2017 |  |  |  |  |  |
Restricted Stock Awards and Units [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted Stock or Unit Expense |  | $ 1,700,000 |  |  |  |  |
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] |  |  |  |  |  |  |
Common stock, shares reserved for issuance |  |  | 41,667 |  |  |  |
Minimum [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock awards, general vesting period |  | 3 years |  |  |  |  |
2018 Omnibus Incentive Plan [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock, shares reserved for issuance |  |  |  |  |  | 300,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  | 4 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  |  |  |  | 10 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  | 100,000 |  |  | 100,000 |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Stock Issuance Terms |  | 85.00% |  |  | 85.00% |  |

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