8. Fair Value: Fair Value, by Balance Sheet Grouping (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Cash and cash equivalents	$ 8,221,576	$ 11,671,253	$ 14,802,015	$ 7,802,831
Loans held for sale	12,583,544	10,297,168
Servicing asset	284,039	319,368
Savings deposits	10,820,460	11,505,417
Accrued interest payable	11,556	13,939
Carrying Amount | Fair Value, Inputs, Level 1
Cash and cash equivalents	8,088,000	11,671,000
Carrying Amount | Fair Value, Inputs, Level 2
Loans held for sale	21,873,000	25,545,000
Servicing asset	284,000	319,000
Interest Receivable	194,000	153,000
Demand Deposits	32,041,000	34,610,000
Savings deposits	10,820,000	11,505,000
Time deposits	8,241,000	9,339,000
Accrued interest payable	12,000	14,000
Fair Value | Fair Value, Inputs, Level 1
Cash and cash equivalents	8,088,000	11,671,000
Fair Value | Fair Value, Inputs, Level 2
Loans held for sale	21,797,000	25,831,000
Servicing asset	284,000	319,000
Interest Receivable	194,000	153,000
Demand Deposits	32,041,000	34,610,000
Savings deposits	10,820,000	11,505,000
Time deposits	8,152,000	9,280,000
Accrued interest payable	$ 12,000	$ 14,000