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Note 18: Commitments and Credit Risk: Letters of Credit (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Details |  |
Letters of Credit Outstanding, Amount | $ 20,000 | $ 26,400
Letters of Credit Terms Up to Five Years | 19,100 | 25,100
Letters of Credit Terms Over Five Years | $ 885 | $ 1,300

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

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
- References No definition available. + Details
Name: | us-gaap_TextBlockAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration