8. Fair Value: Fair Value Measurement Inputs and Valuation Techniques (Details) - USD ($)	9 Months Ended	12 Months Ended
Sep. 30, 2018	Dec. 31, 2017
Loans held at fair value	$ 5,182,526	$ 4,450,901
Servicing asset	$ 284,039	$ 319,368
Fair Value, Recurring \| Fair Value, Inputs, Level 3
Fair Value Measurements Valuation Techniques	Discounted cash flow
Fair Value, Recurring \| Fair Value, Inputs, Level 3 \| Minimum
Constant prepayment rate	7.36%	5.58%
Weighted average discount rate	11.45%	11.75%
Weighted average life	2.23	2.67
Fair Value, Recurring \| Fair Value, Inputs, Level 3 \| Maximum
Constant prepayment rate	14.64%	10.67%
Weighted average discount rate	27.06%	19.74%
Weighted average life	7.13	9.09
Loans Held at Fair Value
Balance at December 31, 2017	$ 4,451,000
Origination of loans/additions	732,000
Principal repayments/amortization	(104,000)
Change in fair value of financial instruments	104,000
Balance at September 30, 2018	$ 5,183,000	$ 4,451,000
Loans Held at Fair Value \| Fair Value, Recurring \| Fair Value, Inputs, Level 3
Fair Value Measurements Valuation Techniques	Discounted cash flow
Loans Held at Fair Value \| Fair Value, Recurring \| Fair Value, Inputs, Level 3 \| Minimum
Constant prepayment rate	11.44%	8.54%
Weighted average discount rate	8.91%	9.00%
Weighted average life	2.23	2.67
Average projected default rate	1.02%	0.75%
Loans Held at Fair Value \| Fair Value, Recurring \| Fair Value, Inputs, Level 3 \| Maximum
Constant prepayment rate	15.00%	10.41%
Weighted average discount rate	12.63%	11.62%
Weighted average life	7.26	9.29
Average projected default rate	9.26%	7.61%
Servicing Asset
Balance at December 31, 2017	$ 319,000
Origination of loans/additions	62,000
Principal repayments/amortization	(92,000)
Change in fair value of financial instruments	(5,000)
Balance at September 30, 2018	284,000	$ 319,000
Thousand
Loans held at fair value	5,183,000	4,451,000
Servicing asset	284,000	319,000
Thousand \| Fair Value, Inputs, Level 3
Loans held at fair value	5,183,000	4,451,000
Servicing asset	284,000	319,000
Thousand \| Loans Held at Fair Value
Loans held at fair value	$ 5,183,000	$ 4,451,000

Represents the Fair Value Inputs, Expected Term, during the indicated time period.

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Represents the percentage value of Fair Value Inputs, Prepayment Rate, during the indicated time period.

+ References

No definition available.

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Represents the percentage value of Average projected default rate, during the indicated time period.

+ References

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Represents the percentage value of Fair Value Inputs, Weighted Average Discount Rate, during the indicated time period.

+ References

No definition available.

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Represents the description of Fair Value Measurements Valuation Techniques, during the indicated time period.

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- Definition

Amount of issuances of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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Amount of increase (decrease) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 820
-SubTopic 10
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- Definition

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2196772

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- Definition

Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 2
-Subparagraph (b)
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