v3.26.1
Fair Value Of Financial Instruments (Schedule Of Carrying Amounts And Estimated Fair Values Of Financial Instruments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Sep. 30, 2025
Mar. 31, 2025
Assets:      
AFS securities $ 809,566 $ 867,216  
Interest rate swap 1,300 926  
Significant Unobservable Inputs (Level 3) [Member]      
Assets:      
Loans receivable 50,200   $ 50,200
Carrying Amount [Member]      
Assets:      
Cash and cash equivalents 330,925 252,443  
AFS securities 809,566 867,216  
Loans receivable 8,114,205 8,111,961  
FHLB stock 79,420 90,662  
Interest rate swap 1,336 926  
Liabilities:      
Deposits 6,924,491 6,591,448  
Borrowings 1,707,055 1,950,770  
Estimated Fair Value [Member]      
Assets:      
Cash and cash equivalents 330,925 252,443  
AFS securities 809,566 867,216  
Loans receivable 7,919,862 7,902,077  
FHLB stock 79,420 90,662  
Interest rate swap 1,336 926  
Liabilities:      
Deposits 6,924,926 6,597,102  
Borrowings 1,704,829 1,952,458  
Estimated Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]      
Assets:      
Cash and cash equivalents 330,925 252,443  
AFS securities 0 0  
Loans receivable 0 0  
FHLB stock 79,420 90,662  
Interest rate swap 0 0  
Liabilities:      
Deposits 3,910,366 3,578,768  
Borrowings 0 0  
Estimated Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member]      
Assets:      
Cash and cash equivalents 0 0  
AFS securities 809,566 867,216  
Loans receivable 0 0  
FHLB stock 0 0  
Interest rate swap 1,336 926  
Liabilities:      
Deposits 3,014,560 3,018,334  
Borrowings 1,704,829 1,952,458  
Estimated Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]      
Assets:      
Cash and cash equivalents 0 0  
AFS securities 0 0  
Loans receivable 7,919,862 7,902,077  
FHLB stock 0 0  
Interest rate swap 0 0  
Liabilities:      
Deposits 0 0  
Borrowings $ 0 $ 0