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FHLB Advances and Other Borrowings (Tables)
 12 Months Ended
Sep. 30, 2021
Federal Home Loan Banks [Abstract]  
Maturity dates of outstanding FHLB advances
The table below shows the contractual maturity dates of outstanding FHLB advances.
 
September 30, 2021September 30, 2020
 (In thousands)
FHLB advances
Within 1 year$1,320,000 $1,830,000 
1 to 3 years400,000 520,000 
3 to 5 years— 350,000 
More than 5 years— — 
$1,720,000 $2,700,000 
Weighted average cost and amount of advances
Financial information pertaining to the weighted-average cost and the amount of FHLB advances were as follows.
 
202120202019
 ($ in thousands)
Weighted average interest rate, including cash flow hedges, at end of year1.51 %1.79 %2.49 %
Weighted daily average interest rate, including cash flow hedges, during the year1.98 %2.03 %2.69 %
Daily average of FHLB advances during the year$2,234,027 $2,532,596 $2,533,890 
Maximum amount of FHLB advances at any month end$2,700,000 $3,050,000 $2,665,000 
Interest expense during the year (including swap interest income and expense)$44,188 $51,445 $68,190