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New Accounting Pronouncements - Additional Information (Details) - USD ($) | Jun. 30, 2020 | Mar. 31, 2020 | Jan. 01, 2020 | Oct. 01, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Held-to-maturity securities, at amortized cost | $ 827,316,000 |  |  |  | $ 1,443,480,000 |  |  |
Available-for-sale, at amortized cost | 2,022,414,000 |  |  |  | 1,458,071,000 |  |  |
Mortgage-backed securities available-for-sale, fair value |  |  | $ 390,669,000 |  |  |  |  |
Increase in other asssets | 342,658,000 |  |  |  | 210,989,000 |  |  |
Decrease to retained earnings | 1,990,509,000 | $ 1,964,612,000 |  |  | 2,032,995,000 | $ 2,012,734,000 | $ 2,004,280,000 | $ 1,996,908,000
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Decrease to retained earnings |  |  |  |  | (21,945,000) |  |  |
Retained Earnings |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Decrease to retained earnings | $ 1,403,124,000 | $ 1,384,833,000 |  |  | 1,335,909,000 | $ 1,300,116,000 | $ 1,262,236,000 | $ 1,188,971,000
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) |  |  |
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] |  |  |  |  |  |  |  |
Increase in other asssets |  |  |  | 29,013,000 |  |  |  |
Increase in 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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