Income Taxes (Components Of Net Deferred Income Tax (Liabilities) Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Deferred income tax assets:
Net loss on securities transactions	$ 47,006	$ 0
ACL	4,989	3,438
Lease liabilities	2,835	2,883
ESOP compensation	1,510	1,472
Salaries, deferred compensation and employee benefits	1,269	2,044
Reserve for off-balance sheet credit exposures	999	1,159
Unrealized loss on AFS securities	368	50,064
Net purchase discounts related to acquired loans	149	102
Low income housing partnerships	92	337
Other	912	891
Gross deferred income tax assets	60,129	62,390
Valuation allowance	(30)	(80)
Gross deferred income tax asset, net of valuation allowance	60,099	62,310
Deferred income tax liabilities:
FHLB stock dividends	17,547	14,590
Unrealized gain on interest rate swaps	3,176	3,061
Premises and equipment	3,164	3,614
ACL	2,936	3,145
Lease right-of-use assets	2,748	2,821
Deposit intangible	411	692
Other	512	503
Gross deferred income tax liabilities	30,494	28,426
Net deferred tax assets	$ 29,605	$ 33,884