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Note 18: Commitments and Credit Risk: Letters of Credit (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Letters of Credit Outstanding, Amount | $ 28,900 | $ 20,000
Letters of Credit Terms Up to Five Years | 28,400 | 19,100
Commercial Lines of Credit |  |
Letters of Credit Outstanding, Amount | 1,100,000 | 912,200
Open-end Consumer Lines of Credit |  |
Letters of Credit Outstanding, Amount | $ 150,900 | $ 133,600

X
- Definition Represents the monetary amount of Letters of Credit Terms Up to Five Years, as of the indicated date. + References No definition available. + Details
Name: | fil_LettersOfCreditTermsUpToFiveYears
Namespace Prefix: | fil_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=fil_CommercialLinesOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=fil_OpenEndConsumerLinesOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |