Fair Value Of Financial Instruments (Schedule Of Carrying Amounts And Estimated Fair Values Of Financial Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Assets:
AFS securities	$ 856,266	$ 1,384,482
Significant Unobservable Inputs (Level 3) [Member]
Assets:
Loans receivable	8,900	4,000
Carrying Amount [Member]
Assets:
Cash and cash equivalents	217,307	245,605
AFS securities	856,266	1,384,482
Loans receivable	7,907,338	7,970,949
FHLB stock	101,175	110,714
Interest rate swaps	2,103	13,018
Liabilities:
Deposits	6,129,982	6,051,220
Borrowings	2,179,564	2,879,125
Estimated Fair Value [Member]
Assets:
Cash and cash equivalents	217,307	245,605
AFS securities	856,266	1,384,482
Loans receivable	7,660,535	7,358,462
FHLB stock	101,175	110,714
Interest rate swaps	2,103	13,018
Liabilities:
Deposits	6,135,652	6,004,975
Borrowings	2,169,403	2,802,849
Estimated Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets:
Cash and cash equivalents	217,307	245,605
AFS securities	0	0
Loans receivable	0	0
FHLB stock	101,175	110,714
Interest rate swaps	0	0
Liabilities:
Deposits	3,164,672	3,321,028
Borrowings	0	0
Estimated Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Cash and cash equivalents	0	0
AFS securities	856,266	1,384,482
Loans receivable	0	0
FHLB stock	0	0
Interest rate swaps	2,103	13,018
Liabilities:
Deposits	2,970,980	2,683,947
Borrowings	2,169,403	2,802,849
Estimated Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets:
Cash and cash equivalents	0	0
AFS securities	0	0
Loans receivable	7,660,535	7,358,462
FHLB stock	0	0
Interest rate swaps	0	0
Liabilities:
Deposits	0	0
Borrowings	$ 0	$ 0