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Summary of Significant Accounting Policies: Cash (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Interest-bearing deposits in Federal Reserve Bank | $ 130,741 | $ 92,255
Minimum |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Maturity of CDs held for investment | 12 months |
Maximum |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Maturity of CDs held for investment | 24 months |
Interest-bearing deposits |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Interest-bearing deposits in Federal Reserve Bank | $ 127,128 | $ 88,420

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- Definition For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.2) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=73530178&loc=d3e59706-112781 + Details
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