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Investment Securities: Schedule of Other than Temporary Impairments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Held to Maturity |  |  |  |
Held To Maturity - total (OTTI) recoveries |  | $ 71 | $ 73 | $ 38
Net recoveries on investment securities |  | 59 | 68 | 33
Held-to-maturity Securities |  |  |  |
Held to Maturity |  |  |  |
Held To Maturity - total (OTTI) recoveries |  | 71 | 73 | 38
Held To Maturity - adjustment for portion of OTTI recorded as (transferred from) other comprehensive income (before income taxes) | [1] | (12) | (5) | (5)
Net recoveries on investment securities | [2] | $ 59 | $ 68 | $ 33
[1] | Represents OTTI related to all other factors.
[2] | Represents OTTI related to credit losses.

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