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Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) branch payment segment | Oct. 27, 2020 USD ($) | Sep. 30, 2019 USD ($) | Oct. 09, 2013 USD ($)
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Number of offices | branch | 234 |  |  |
Cash collateral | $ 97,600 |  | $ 31,850 |
Days past grace period to initiate contact to cure deficiency | 30 days |  |  |
Minimum days past due to begin foreclosure proceedings | 90 days |  |  |
Approximate rate reduction concession, minimum | 1.00% |  |  |
Approximate rate reduction concession, maximum | 2.00% |  |  |
Minimum days past due to stop accrual of interest | 90 days |  |  |
Loans returned to full accrual status | 90 days |  |  |
Number of payments required | payment | 6 |  |  |
Options exercisable, weighted average remaining contractual term (in years) | 6 months |  |  |
Number of reportable business segments | segment | 1 |  |  |
Civil money penalty from consent order issued |  |  |  | $ 34
Subsequent Event |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Civil money penalty from consent order issued |  | $ 200 |  |
Minimum |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Term for payment and rate reduction | 6 months |  |  |
Award vesting period (in years) | 3 years |  |  |
Maximum |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Term for payment and rate reduction | 12 months |  |  |
Award vesting period (in years) | 5 years |  |  |
Options exercisable, weighted average remaining contractual term (in years) | 10 years |  |  |
Stock Options and Restricted Stock | Minimum |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Award vesting period (in years) | 2 years |  |  |
Stock Options and Restricted Stock | Maximum |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Award vesting period (in years) | 5 years |  |  |

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