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Investment Securities: Schedule of Other than Temporary Impairments (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Held to Maturity      
Held To Maturity - total (OTTI) recoveries $ 20 $ 120 $ 71
Net recoveries on investment securities 20 120 59
Held-to-maturity Securities      
Held to Maturity      
Held To Maturity - total (OTTI) recoveries 20 120 71
Held To Maturity - adjustment for portion of OTTI recorded as (transferred from) other comprehensive income (before income taxes) [1] 0 0 (12)
Net recoveries on investment securities [2] $ 20 $ 120 $ 59
[1] Represents OTTI related to all other factors.
[2] Represents OTTI related to credit losses.