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Note 3: Loans and Allowance for Loan Losses: Weighted Average Interest Rate on Loans Receivable (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Loans Receivable, Weighted Average Interest Rate | 5.16% | 4.74%
Commercial loan participations sold to other financial institutions | $ 181,500 | $ 164,800
Residential mortgage loans sold | 78,700 | 89,200
Unpaid principal balances |  |
Loans serviced for others | 260,200 | 254,000
Unused lines of Credit |  |
Loans serviced for others | $ 121,000 | $ 37,800

X
- Definition Represents the monetary amount of Commercial loan participations sold to other financial institutions, during the indicated time period. + References No definition available. + Details
Name: | fil_CommercialLoanParticipationsSoldToOtherFinancialInstitutions
Namespace Prefix: | fil_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the Loans Receivable, Weighted Average Interest Rate, as of the indicated date. + References No definition available. + Details
Name: | fil_LoansReceivableWeightedAverageInterestRate
Namespace Prefix: | fil_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the monetary amount of Loans serviced for others, during the indicated time period. + References No definition available. + Details
Name: | fil_LoansServicedForOthers
Namespace Prefix: | fil_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the monetary amount of Residential mortgage loans sold, during the indicated time period. + References No definition available. + Details
Name: | fil_ResidentialMortgageLoansSold
Namespace Prefix: | fil_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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