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Summary of Significant Accounting Policies - Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Goodwill |  |  |  |
Goodwill, beginning of period | $ 301,368 | $ 293,153 |  |
Additions | 0 | 8,215 |  |
Goodwill, end of period | 301,368 | 301,368 |  |
Core Deposit and Other Intangibles |  |  |  |
Intangible assets, beginning of period | 9,918 | 5,529 |  |
Additions | 0 | 6,595 |  |
Amortization | (2,039) | (2,206) |  |
Intangible assets, end of period | 7,879 | 9,918 |  |
Total |  |  |  |
Goodwill and intangible assets, beginning of period | 311,286 | 298,682 |  |
Additions | 0 | 14,810 |  |
Amortization | (2,039) | (2,206) |  |
Goodwill and intangible assets, end of period | 309,247 | 311,286 |  |
Increase in goodwill | 301,368 | 293,153 | $ 301,368 | $ 301,368
Increase in finite-lived intangible assets | 9,918 | 5,529 | 7,879 | 9,918
Decrease in other assets |  |  | 210,989 | 196,494
Amortization expense for intangible assets | 2,039 | 2,206 |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |
2020 |  |  | 1,984 |
2021 |  |  | 1,140 |
2022 |  |  | 804 |
2023 |  |  | 775 |
2024 |  |  | $ 755 |
Restatement Adjustment | Acquisition of Businesses in Prior Years |  |  |  |
Goodwill |  |  |  |
Goodwill, beginning of period | 7,135 |  |  |
Goodwill, end of period |  | 7,135 |  |
Core Deposit and Other Intangibles |  |  |  |
Intangible assets, beginning of period | 5,106 |  |  |
Amortization |  | (1,500) |  |
Intangible assets, end of period |  | 5,106 |  |
Total |  |  |  |
Amortization |  | (1,500) |  |
Increase in goodwill | 7,135 | 7,135 |  | 7,135
Increase in finite-lived intangible assets | $ 5,106 | 5,106 |  | 5,106
Decrease in other assets |  |  |  | $ (12,241)
Amortization expense for intangible assets |  | $ 1,500 |  |

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