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Investment Securities: Schedule of significant inputs utilized to measure management's estimate of the credit loss component on OTTI securities (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |
Recoveries (other than temporary impairment OTTI) on investment securities | $ (11) | $ (27)
Net recoveries on investment securities | (11) | (22)
Held-to-maturity Securities |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |
Recoveries (other than temporary impairment OTTI) on investment securities | 11 | 27
Held to Maturity - adjustment for portion of OTTI recorded as OCI before income taxes | 0 | (5)
Net recoveries on investment securities | 11 | 22
Available-for-sale Securities |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |
AFS - OTTI | 0 | 0
AFS - - adjustment for portion of OTTI recorded as OCI before income taxes | 0 | 0
AFS - Net OTTI recognized in earnings | $ 0 | $ 0
Minimum |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |
OTTI significant inputs - Constant prepayment rate | 6.00% | 6.00%
OTTI significant inputs - Collateral default rate | 0.00% | 0.00%
OTTI significant inputs - Loss severity rate | 0.00% | 0.00%
Maximum |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |
OTTI significant inputs - Constant prepayment rate | 15.00% | 15.00%
OTTI significant inputs - Collateral default rate | 11.94% | 11.08%
OTTI significant inputs - Loss severity rate | 77.00% | 62.00%
Weighted Average |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] |  |
OTTI significant inputs - Constant prepayment rate | 13.56% | 9.91%
OTTI significant inputs - Collateral default rate | 5.72% | 4.77%
OTTI significant inputs - Loss severity rate | 46.97% | 37.32%

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- Definition The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=82896770&loc=SL6284422-111562 + Details
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- Definition The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=82896770&loc=SL6284422-111562 + Details
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