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Summary of Significant Accounting Policies - Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Goodwill |  |
Goodwill, beginning of period | $ 293,153 | $ 291,503
Additions | 8,215 | 1,650
Goodwill, end of period | 301,368 | 293,153
Core Deposit and Other Intangibles |  |
Intangible assets, beginning of period | 5,529 | 5,486
Additions | 6,595 | 1,720
Amortization | (2,206) | (1,677)
Intangible assets, end of period | 9,918 | 5,529
Total |  |
Goodwill and intangible assets, beginning of period | 298,682 | 296,989
Additions | 14,810 | 3,370
Amortization | (2,206) | (1,677)
Goodwill and intangible assets, end of period | 311,286 | 298,682
Other assets | (196,494) | $ (185,826)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |
2019 | 2,033 |
2020 | 1,990 |
2021 | 1,140 |
2022 | 804 |
2023 | 775 |
Restatement Adjustment | Acquisition of Businesses in Prior Years |  |
Goodwill |  |
Goodwill, end of period | 7,135 |
Core Deposit and Other Intangibles |  |
Amortization | (1,500) |
Intangible assets, end of period | 5,106 |
Total |  |
Amortization | (1,500) |
Other assets | $ 12,241 |

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