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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Sep. 30, 2021
Equity [Abstract]  
Schedule of Changes in Accumulated Other Comprehensive Income (Loss)
The changes in accumulated other comprehensive income (loss) ("AOCI") by component during the years ended September 30, 2021, 2020 and 2019 are as follows (dollars in thousands):
Changes in fair value of available for sale securities [1]
Changes in OTTI on held to maturity securities [1]
Total [1]
2021
Balance of AOCI at the beginning of period$87 $(26)$61 
Other comprehensive income (loss)(12)10 (2)
Balance of AOCI at the end of period$75 $(16)$59 
2020
Balance of AOCI at the beginning of period$90 $(40)$50 
Other comprehensive income (loss)(3)14 11 
Balance of AOCI at the end of period$87 $(26)$61 
2019
Balance of AOCI at the beginning of period$(58)$(71)$(129)
Other comprehensive income85 31 116 
Adoption of ASU 2016-01$63 $— $63 
Balance of AOCI at the end of period$90 $(40)$50 
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[1] All amounts are net of income taxes.