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Revenue from Contracts with Customers (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Service charges on deposits      
Revenue from External Customer [Line Items]      
Service charges on deposits $ 3,915 $ 4,062 $ 3,824
ATM and debit card interchange transaction fees      
Revenue from External Customer [Line Items]      
Service charges on deposits 4,975 5,066 5,194
Escrow fees      
Revenue from External Customer [Line Items]      
Service charges on deposits 96 71 $ 109
Fee income from non-deposit investment sales      
Revenue from External Customer [Line Items]      
Service charges on deposits $ 35 $ 12