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Loans - Changes in Accretable Difference on Purchased Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Changes in Accretable Difference on Purchased Loans [Abstract]    
Balance at beginning of period $ 346 $ 0
Accretable differences acquired   540
Accretion (1,822) (194)
Adjustments to accretable difference due to changes in expected cash flows 1,019 0
Other changes, net 537 0
Ending balance $ 80 $ 346