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Revenue from Contracts with Customers (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Service charges on deposits      
Revenue from External Customer [Line Items]      
Service charges on deposits $ 3,964 $ 3,911 $ 4,147
ATM and debit card interchange transaction fees      
Revenue from External Customer [Line Items]      
Service charges on deposits 5,210 5,084 4,378
Escrow fees      
Revenue from External Customer [Line Items]      
Service charges on deposits 211 290 $ 273
Fee income from non-deposit investment sales      
Revenue from External Customer [Line Items]      
Service charges on deposits $ 27 $ 23