8. Fair Value: Fair Value, by Balance Sheet Grouping (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Cash and cash equivalents	$ 10,085,000	$ 11,671,253	$ 10,766,282	$ 7,802,831
Loans held for sale	11,431,484	10,297,168
Servicing asset	311,190	319,368
Savings deposits	11,472,700	11,505,417
Accrued interest payable	23,773	13,939
Carrying Amount | Fair Value, Inputs, Level 1
Cash and cash equivalents	9,952,000	11,671,000
Carrying Amount | Fair Value, Inputs, Level 2
Loans held for sale	22,707,000	25,545,000
Servicing asset	311,000	319,000
Interest Receivable	154,000	153,000
Demand Deposits	31,334,000	34,610,000
Savings deposits	11,473,000	11,505,000
Time deposits	9,568,000	9,339,000
Accrued interest payable	24,000	14,000
Fair Value | Fair Value, Inputs, Level 1
Cash and cash equivalents	9,952,000	11,671,000
Fair Value | Fair Value, Inputs, Level 2
Loans held for sale	22,879,000	25,831,000
Servicing asset	311,000	319,000
Interest Receivable	154,000	153,000
Demand Deposits	31,334,000	34,610,000
Savings deposits	11,473,000	11,505,000
Time deposits	9,501,000	9,280,000
Accrued interest payable	$ 24,000	$ 14,000