8. Fair Value: Schedule of Fair Value of Assets Measured on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Assets, Fair Value, Nonrecurring	$ 5,287	$ 5,578
Fair Value, Inputs, Level 1
Assets, Fair Value, Nonrecurring	131	130
Fair Value, Inputs, Level 2
Assets, Fair Value, Nonrecurring	5,156	5,548
Fair Value, Inputs, Level 3
Assets, Fair Value, Nonrecurring	0	0
Impaired Loans, Carrying Value
Assets, Fair Value, Nonrecurring	472	418
Total fair value gain during the period	0	0
Impaired Loans, Carrying Value | Fair Value, Inputs, Level 1
Assets, Fair Value, Nonrecurring	0	0
Impaired Loans, Carrying Value | Fair Value, Inputs, Level 2
Assets, Fair Value, Nonrecurring	0	0
Impaired Loans, Carrying Value | Fair Value, Inputs, Level 3
Assets, Fair Value, Nonrecurring	472	418
Other Real Estate Owned
Assets, Fair Value, Nonrecurring	447	447
Total fair value gain during the period	0	0
Other Real Estate Owned | Fair Value, Inputs, Level 1
Assets, Fair Value, Nonrecurring	0	0
Other Real Estate Owned | Fair Value, Inputs, Level 2
Assets, Fair Value, Nonrecurring	0	0
Other Real Estate Owned | Fair Value, Inputs, Level 3
Assets, Fair Value, Nonrecurring	$ 447	$ 447