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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

Maturity Of Certificates Of Deposit Held-for-investment

+ References

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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

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