11. Fair Value: Schedule of Fair Value of Assets Measured on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Assets, Fair Value, Nonrecurring	$ 5,145	$ 5,578
Impaired Loans, Carrying Value
Assets, Fair Value, Nonrecurring	134	418
Total fair value loss during the year	0	0
Other Real Estate Owned
Assets, Fair Value, Nonrecurring	626	447
Total fair value loss during the year	(32)	0
Fair Value, Inputs, Level 1
Assets, Fair Value, Nonrecurring	132	130
Fair Value, Inputs, Level 1 | Impaired Loans, Carrying Value
Assets, Fair Value, Nonrecurring	0	0
Fair Value, Inputs, Level 1 | Other Real Estate Owned
Assets, Fair Value, Nonrecurring	0	0
Fair Value, Inputs, Level 2
Assets, Fair Value, Nonrecurring	5,013	5,448
Fair Value, Inputs, Level 2 | Impaired Loans, Carrying Value
Assets, Fair Value, Nonrecurring	0	0
Fair Value, Inputs, Level 2 | Other Real Estate Owned
Assets, Fair Value, Nonrecurring	0	0
Fair Value, Inputs, Level 3
Assets, Fair Value, Nonrecurring	0	0
Fair Value, Inputs, Level 3 | Impaired Loans, Carrying Value
Assets, Fair Value, Nonrecurring	134	418
Fair Value, Inputs, Level 3 | Other Real Estate Owned
Assets, Fair Value, Nonrecurring	$ 626	$ 447