8. Fair Value: Fair Value, by Balance Sheet Grouping (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Cash and cash equivalents	$ 13,302,137	$ 11,671,253	$ 9,794,718	$ 7,802,831
Loans held for sale	10,468,182	10,297,168
Servicing asset	317,963	319,368
Savings deposits	11,690,120	11,505,417
Accrued interest payable	22,302	13,939
Carrying Amount | Level 1
Cash and cash equivalents	13,170,000	11,671,000
Interest Receivable	120,000	153,000
Demand Deposits	34,561,000	34,610,000
Savings deposits	11,690,000	11,505,000
Time deposits	9,575,000	9,339,000
Accrued interest payable	22,000	14,000
Carrying Amount | Level 2
Loans held for sale	24,011,000	25,545,000
Carrying Amount | Level 3
Servicing asset	318,000	319,000
Fair Value | Level 1
Cash and cash equivalents	13,170,000	11,671,000
Interest Receivable	120,000	153,000
Demand Deposits	34,561,000	34,610,000
Savings deposits	11,690,000	11,505,000
Time deposits	9,491,000	9,280,000
Accrued interest payable	22,000	14,000
Fair Value | Level 2
Loans held for sale	23,951,000	25,831,000
Fair Value | Level 3
Servicing asset	$ 318,000	$ 319,000