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BORROWINGS (Tables)
 12 Months Ended
Sep. 30, 2025
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, 2025
September 30, 2024
 
(In thousands)
Within 1 year
$1,747,041
$2,099,353
1 to 3 years
—
93,354
3 to 5 years
18,563
167
$1,765,604
$2,192,874
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.
 
2025
2024
2023
 
($ in thousands)
Weighted average interest rate, including cash flow hedges, at end of year
2.35%
3.32%
3.83%
Weighted daily average interest rate, including cash flow hedges, during the year
3.09%
3.78%
3.42%
Daily average of FHLB advances during the year
$2,260,209
$2,952,872
$2,916,849
Maximum amount of FHLB advances at any month end
$2,913,373
$4,338,731
$3,425,000
Interest expense during the year (including swap interest income and expense)
$69,912
$111,574
$99,631