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New Accounting Pronouncements - Narrative (Details) - USD ($) | Sep. 30, 2020 | Jan. 01, 2020 | Oct. 01, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Held-to-maturity securities, at amortized cost | $ 705,838,000 |  |  | $ 1,443,480,000 |  |
Available-for-sale, at amortized cost | 2,210,099,000 |  |  | 1,458,071,000 |  |
Mortgage-backed securities available-for-sale, fair value |  | $ 390,669,000 |  |  |  |
Decrease in other assets | 346,508,000 |  |  | 210,989,000 |  |
Decrease to retained earnings | 2,014,133,000 |  |  | 2,032,995,000 | $ 1,996,908,000 | $ 2,005,688,000
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Decrease to retained earnings |  |  |  | (21,945,000) |  | 0
Retained Earnings |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Decrease to retained earnings | $ 1,420,906,000 |  |  | 1,335,909,000 | $ 1,188,971,000 | 1,042,890,000
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Decrease to retained earnings |  |  | $ (21,945,000) | $ (21,945,000) |  | $ (1,772,000)
Accounting Standards Update 2019-04 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Mortgage-backed securities held-to-maturity, fair value |  | (390,669,000) |  |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Decrease in other assets |  |  | 29,013,000 |  |  |
Other liabilities |  |  | 29,013,000 |  |  |
Accounting Standards Update 2016-02 | Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Decrease to retained earnings |  |  | $ 0 |  |  |
Mortgage-backed securities | Accounting Standards Update 2019-04 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Held-to-maturity securities, at amortized cost |  | (374,680,000) |  |  |  |
Available-for-sale, at amortized cost |  | $ 374,680,000 |  |  |  |

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