5. Bank Premises and Equipment: Schedule of Major Classes of Bank Premises and Equipment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment, Gross	$ 2,271,000	$ 2,164,000
Less accumulated depreciation	(1,968,000)	(1,784,000)
Bank premises and equipment, net	303,298	380,471
Leaseholds and Leasehold Improvements
Property, Plant and Equipment, Gross	832,000	832,000
Furniture and Fixtures
Property, Plant and Equipment, Gross	$ 1,439,000	$ 1,332,000
Minimum | Leaseholds and Leasehold Improvements
Estimated Useful Life	10 years
Minimum | Furniture and Fixtures
Estimated Useful Life	3 years
Maximum | Leaseholds and Leasehold Improvements
Estimated Useful Life	15 years
Maximum | Furniture and Fixtures
Estimated Useful Life	7 years