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11. Fair Value: Schedule of Inputs in Estimation of Fair Value of Level 3 Financial Instruments (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Loans held at fair value $ 4,450,901 $ 4,207,338
Servicing asset 319,368 312,814
Servicing asset [Member]    
Servicing asset at beginning 313,000 200,000
Additions related to new loan originations 57,000 160,000
Change in fair value (51,000) (47,000)
Servicing asset at end 319,000 313,000
Loans Held At Fair Value    
Balance, Starting 4,207,000 2,459,000
Origination of loans 816,000 2,068,000
Principal repayments (191,000) (324,000)
Change in fair value of financial instruments (381,000) 4,000
Balance, Ending 4,451,000 4,207,000
Fair Value, Inputs, Level 3    
Loans held at fair value 4,451,000 4,207,000
Servicing asset 319,000 313,000
Fair Value, Inputs, Level 3 | Loans Held At Fair Value    
Loans held at fair value $ 4,451,000 $ 4,207,000
Principal valuation technique Discounted cash flow Discounted cash flow
Fair Value, Inputs, Level 3 | Servicing asset [Member]    
Principal valuation technique Discounted cash flow Discounted cash flow
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Servicing asset [Member]    
Servicing asset $ 319,000 $ 313,000
Minimum | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Loans Held At Fair Value    
Constant prepayment rate 8.54% 7.53%
Weighted average life 2 years 8 months 2 days 3 years 18 days
Weighted average discount rate 9.00% 8.11%
Projected default rate 0.75% 0.77%
Minimum | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Servicing asset [Member]    
Constant prepayment rate 5.58% 4.89%
Weighted average life 2 years 8 months 2 days 3 years 18 days
Weighted average discount rate 11.75% 10.50%
Maximum | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Loans Held At Fair Value    
Constant prepayment rate 10.41% 9.62%
Weighted average life 9 years 3 months 15 days 9 years 11 months 12 days
Weighted average discount rate 11.62% 10.58%
Projected default rate 7.61% 6.64%
Maximum | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring | Servicing asset [Member]    
Constant prepayment rate 10.67% 9.96%
Weighted average life 9 years 1 month 2 days 9 years 8 months 12 days
Weighted average discount rate 19.74% 15.31%