Fair Value Of Financial Instruments (Schedule Of Carrying Amounts And Estimated Fair Values Of Financial Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Sep. 30, 2024	Jun. 30, 2024
Assets:
AFS Securities	$ 956,229	$ 856,266
Significant Unobservable Inputs (Level 3) [Member]
Assets:
Loans receivable	89,600		$ 1,600
Carrying Amount [Member]
Assets:
Cash and cash equivalents	174,965	217,307
AFS Securities	956,229	856,266
Loans receivable	8,023,554	7,907,338
FHLB stock	98,225	101,175
Interest rate swaps	1,463	2,103
Liabilities:
Deposits	6,431,137	6,129,982
Borrowings	2,071,585	2,179,564
Estimated Fair Value [Member]
Assets:
Cash and cash equivalents	174,965	217,307
AFS Securities	956,229	856,266
Loans receivable	7,739,102	7,660,535
FHLB stock	98,225	101,175
Interest rate swaps	1,463	2,103
Liabilities:
Deposits	6,431,235	6,135,652
Borrowings	2,066,711	2,169,403
Estimated Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets:
Cash and cash equivalents	174,965	217,307
AFS Securities	0	0
Loans receivable	0	0
FHLB stock	98,225	101,175
Interest rate swaps	0	0
Liabilities:
Deposits	3,509,556	3,164,672
Borrowings	0	0
Estimated Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Cash and cash equivalents	0	0
AFS Securities	956,229	856,266
Loans receivable	0	0
FHLB stock	0	0
Interest rate swaps	1,463	2,103
Liabilities:
Deposits	2,921,679	2,970,980
Borrowings	2,066,711	2,169,403
Estimated Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets:
Cash and cash equivalents	0	0
AFS Securities	0	0
Loans receivable	7,739,102	7,660,535
FHLB stock	0	0
Interest rate swaps	0	0
Liabilities:
Deposits	0	0
Borrowings	$ 0	$ 0