Fair Value Measurements - Foreclosed Assets Remeasured and Reported at Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Sep. 30, 2025
Fair Value Disclosures [Abstract]
Foreclosed Assets Remeasured at Initial Recognition Carrying Value Of Foreclosed Assets Prior To Remeasurement	$ 2,685	$ 659
Foreclosed Assets Remeasured at Initial Recognition Write-downs Included In Other Non-interest Expense	(353)	0
Fair Value of Foreclosed Assets Remeasured at Initial Recognition	2,332	659
Foreclosed Assets Remeasured Subsequent to Initial Recognition Carrying Value Of Foreclosed Assets Prior To Remeasurement	867	0
Foreclosed Assets Remeasured Subsequent to initial Recognition Write Downs Included In Other Non Interest Expense	(212)	0
Fair Value of Foreclosed Assets remeasured subsequent to initial recognition	$ 655	$ 0