Note 7: Investments in Limited Partnerships: Investments in Affordable Housing Partnerships Policy (Details) $ in Thousands			12 Months Ended
Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Details
Number of Investments in Affordable Housing Partnerships	17	16
Investments in Affordable Housing Partnerships Carrying Value, Net	$ 22,900	$ 18,200	$ 22,900	$ 18,200
Federal Affordable Housing Tax Credits	33,100		33,100
Expected Amortization of Investments in Affordable Housing Partnerships	29,300		29,300
Usage of Federal Affordable Housing Tax Credits	$ 6,600	$ 6,600	6,600	6,600	$ 6,200
Actual Amortization of Investments in Affordable Housing Partnerships			$ 5,000	$ 5,200	$ 4,400

Represents the monetary amount of Actual Amortization of Investments in Affordable Housing Partnerships, during the indicated time period.

No definition available.

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Represents the monetary amount of Expected Amortization of Investments in Affordable Housing Partnerships, as of the indicated date.

No definition available.

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Represents the monetary amount of Federal Affordable Housing Tax Credits, as of the indicated date.

No definition available.

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Represents the monetary amount of Investments in Affordable Housing Partnerships Carrying Value, Net, as of the indicated date.

No definition available.

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Represents the pure numeric value of Number of Investments in Affordable Housing Partnerships, during the indicated time period.

No definition available.

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Represents the monetary amount of Usage of Federal Affordable Housing Tax Credits, as of the indicated date.

No definition available.

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Data Type:	xbrli:monetaryItemType
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No definition available.