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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Commitments and Contingencies Disclosure [Abstract]      
Reserve for unfunded loan commitments   $ 320 $ 305
Employee severance compensation plan, employee minimum service requirement (in years) 2 years    
Employee severance compensation plan, period following effective date of a change in company control (in months) 12 months    
Employee severance compensation plan, eligible payment, maximum compensation term (in months) 18 months