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Recent Accounting Pronouncements - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Mar. 31, 2024
Sep. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]              
Adjustment to retained earnings, net of deferred tax; - adoption of ASU 2016-13   $ 488 $ 0        
Adjustment to opening balance   461          
Allowance for Credit Losses ("ACL")   72   $ 85 $ 0    
Allowance for credit losses for unfunded loan commitments $ 327 267 327 276 332 $ 320 $ 305
Financing Receivable, Allowance for Credit Loss, Writeoff $ 1 $ 87 $ 7        
Impact of Adopting CECL (ASU 2016-13)              
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]              
Allowance for Credit Losses ("ACL")       $ 0 92    
Allowance for credit losses for unfunded loan commitments         $ 65   $ 0