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Note 4: Acquired Loans, Loss Sharing Agreements and FDIC Indemnification Assets: Business Combinations Policy (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Valley Bank |  |  |
Discount Recorded in Conjunction with Fair Value of Acquired Loans and Amount Accreted to Yield | $ 217 | $ 491 | $ 794

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- Definition Represents the monetary amount of Discount Recorded in Conjunction with Fair Value of Acquired Loans and Amount Accreted to Yield, during the indicated time period. + References No definition available. + Details
Name: | fil_DiscountRecordedInConjunctionWithFairValueOfAcquiredLoansAndAmountAccretedToYield
Namespace Prefix: | fil_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=fil_ValleyBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |