Income Taxes (Differences Between Effective Rates And Statutory Federal Income Tax Rate Computed On Income Before Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Federal income tax expense computed at statutory Federal rate, Amount	$ 11,362	$ (29,180)	$ 22,513
Federal income tax expense computed at statutory Federal rate, Percentage	21.00%	21.00%	21.00%
Increases (Decreases) In Taxes Resulting From:
Income tax expense related to Bank's earning distributions	$ 5,406	$ 0	$ 0
Income tax expense related to the Bank's earning distributions, Percentage	10.00%	0.00%	0.00%
State taxes, net of Federal tax effect, Amount	$ 2,497	$ (5,412)	$ 3,399
State taxes, net of Federal tax effect, Percentage	4.80%	3.90%	3.20%
Low income housing tax credits, net, Amount	$ (2,244)	$ (2,303)	$ (2,238)
Low income housing tax credits, net, Percentage	(4.20%)	1.60%	(2.10%)
ESOP related expenses, net, Amount	$ (448)	$ (652)	$ (641)
ESOP related expenses, net, Percentage	(0.80%)	0.50%	(0.60%)
Other, Amount	$ (480)	$ 251	$ (283)
Other, Percentage	(1.10%)	(0.20%)	(0.30%)
Income tax expense	$ 16,093	$ (37,296)	$ 22,750
Income tax expense, Percentage	29.70%	26.80%	21.20%