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Note 3: Loans and Allowance for Loan Losses: Impaired Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Details |  |  |
Impaired Loans With Specific Valuation Allowance | $ 8,400 | $ 12,700 | $ 18,100
Impaired Loans Valuation Allowance | 2,000 | 4,000 | 6,400
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans | $ 1,000 | $ 1,200 | $ 1,500

X
- Definition Represents the monetary amount of Impaired Loans Valuation Allowance, as of the indicated date. + References No definition available. + Details
Name: | fil_ImpairedLoansValuationAllowance
Namespace Prefix: | fil_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the monetary amount of Impaired Loans With Specific Valuation Allowance, as of the indicated date. + References No definition available. + Details
Name: | fil_ImpairedLoansWithSpecificValuationAllowance
Namespace Prefix: | fil_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18794-111554 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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