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Borrowings (Tables)
 12 Months Ended
Sep. 30, 2024
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, 2024September 30, 2023
 (In thousands)
Within 1 year$2,099,353 $2,900,000 
1 to 3 years93,354 — 
3 to 5 years167 — 
$2,192,874 $2,900,000 
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.
 
202420232022
 ($ in thousands)
Weighted average interest rate, including cash flow hedges, at end of year3.32 %3.83 %2.02 %
Weighted daily average interest rate, including cash flow hedges, during the year3.78 %3.42 %1.66 %
Daily average of FHLB advances during the year$2,952,872 $2,916,849 $1,731,110 
Maximum amount of FHLB advances at any month end$4,338,731 $3,425,000 $2,125,000 
Interest expense during the year (including swap interest income and expense)$111,574 $99,631 $28,729