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Summary of Significant Accounting Policies - Narrative (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Oct. 29, 2019 $ / shares | Sep. 30, 2019 USD ($) payment segment part branch | Sep. 30, 2018 USD ($)
Summary of Significant Accounting Policies [Line Items] |  |  |
Number of offices | branch |  | 234 |
Cash collateral |  | $ 31,850 | $ 18,000
Loans in process |  | $ 1,201,341 | 1,195,506
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 |
Number of parts in loss percentage factor | part |  | 2 |
Options exercisable, weighted average remaining contractual term (in years) |  | 1 year 4 months 24 days |
Number of reportable business segments | segment |  | 1 |
Subsequent Event |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Dividends declared (in dollars per share) | $ / shares | $ 0.21 |  |
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 |
Loans and Leases Receivable |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Loans in process |  | $ 2,379,089 | $ 2,180,162

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