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12) Mortgage Servicing Rights: Assumptions used in determining MSR value (Details) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Details |  |
Prepayment Speeds | 4.24% | 3.67%
Average Life in Years of MSR | 7.02 | 6.34
Discount Rate | 9.51 | 10.01

X
- Definition Represents the Average Life in Years of MSR, during the indicated time period. + References No definition available. + Details
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Namespace Prefix: | fil_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the Discount Rate, during the indicated time period. + References No definition available. + Details
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Namespace Prefix: | fil_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the Prepayment Speeds, during the indicated time period. + References No definition available. + Details
Name: | fil_PrepaymentSpeeds
Namespace Prefix: | fil_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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