Summary of Significant Accounting Policies: Premises and Equipment (Details)	12 Months Ended
Sep. 30, 2021
Buildings and improvements \| Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Buildings and improvements \| Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	40 years
Furniture and equipment \| Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Furniture and equipment \| Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	7 years

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

No definition available.

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration