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Borrowings (Tables) | 12 Months Ended
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Sep. 30, 2023
Debt Disclosure [Abstract] |
Schedule of Maturity dates of Outstanding FHLB Advances | The table below shows the contractual maturity dates of outstanding FHLB advances.
| September 30, 2023 | September 30, 2022
| (In thousands)
Within 1 year | $ | 2,900,000 |  | $ | 2,025,000 |
1 to 3 years | — |  | 100,000 |
| $ | 2,900,000 |  | $ | 2,125,000 |
Schedule of Weighted Average Cost and Amount of Advances | Financial information pertaining to the weighted-average cost and the amount of FHLB advances were as follows.
| 2023 | 2022 | 2021
| ($ in thousands)
Weighted average interest rate, including cash flow hedges, at end of year | 3.83 | % | 2.02 | % | 1.51 | %
Weighted daily average interest rate, including cash flow hedges, during the year | 3.42 | % | 1.66 | % | 1.98 | %
Daily average of FHLB advances during the year | $ | 2,916,849 |  | $ | 1,731,110 |  | $ | 2,234,027 |
Maximum amount of FHLB advances at any month end | $ | 3,425,000 |  | $ | 2,125,000 |  | $ | 2,700,000 |
Interest expense during the year (including swap interest income and expense) | $ | 99,631 |  | $ | 28,729 |  | $ | 44,188 |

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