4. Loans and Allowance For Loan Losses: Schedule of Bank Loans by Class According to Credit Quality (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Commercial real estate	$ 21,488,000	$ 26,414,000
Consumer real estate	1,729,000	2,232,000
Consumer loans other	809,000	966,000
Total consumer loans	2,538,000	3,198,000
Good/Excellent
Total commercial loans	298,000	309,000
Satisfactory
Total commercial loans	17,021,000	18,011,000
Pass
Total commercial loans	3,770,000	2,333,000
Special Mention
Total commercial loans	36,000	844,000
Substandard
Total commercial loans	1,375,000	1,843,000
Doubtful
Total commercial loans	293,000	297,000
Total
Total commercial loans	23,187,000	23,637,000
Performing
Consumer real estate	1,392,000	1,659,000
Consumer loans other	809,000	904,000
Total consumer loans	2,201,000	2,563,000
Nonperforming
Consumer real estate	337,000	573,000
Consumer loans other	0	62,000
Total consumer loans	337,000	635,000
Commercial And Industrial | Good/Excellent
Total commercial loans	250,000	260,000
Commercial And Industrial | Satisfactory
Total commercial loans	972,000	1,073,000
Commercial And Industrial | Pass
Total commercial loans	171,000	207,000
Commercial And Industrial | Special Mention
Total commercial loans	19,000	38,000
Commercial And Industrial | Substandard
Total commercial loans	310,000	495,000
Commercial And Industrial | Doubtful
Total commercial loans	76,000	76,000
Commercial And Industrial | Total
Total commercial loans	1,798,000	2,149,000
Consumer Real Estate
Consumer real estate	1,729,000	2,232,000
Consumer Real Estate | Total | Home Equity
Consumer real estate	641,000	799,000
Consumer Real Estate | Total | Home Equity Line Of Credit
Consumer real estate	17,000	19,000
Consumer Real Estate | Total | 1-4 Family Residential Mortgages
Consumer real estate	1,071,000	1,414,000
Consumer Real Estate | Performing | Home Equity
Consumer real estate	352,000	301,000
Consumer Real Estate | Performing | Home Equity Line Of Credit
Consumer real estate	17,000	19,000
Consumer Real Estate | Performing | 1-4 Family Residential Mortgages
Consumer real estate	1,023,000	1,339,000
Consumer Real Estate | Nonperforming | Home Equity
Consumer real estate	289,000	498,000
Consumer Real Estate | Nonperforming | Home Equity Line Of Credit
Consumer real estate	0	0
Consumer Real Estate | Nonperforming | 1-4 Family Residential Mortgages
Consumer real estate	48,000	75,000
Consumer And Other Loans | Total | Student Loans
Consumer loans other	700,000	855,000
Consumer And Other Loans | Total | Other
Consumer loans other	109,000	111,000
Consumer And Other Loans | Performing | Student Loans
Consumer loans other	700,000	794,000
Consumer And Other Loans | Performing | Other
Consumer loans other	109,000	110,000
Consumer And Other Loans | Nonperforming | Student Loans
Consumer loans other	0	61,000
Consumer And Other Loans | Nonperforming | Other
Consumer loans other	0	1,000
Commercial Real Estate Portfolio Segment
Commercial real estate	21,389,000	21,488,000
Commercial Real Estate Portfolio Segment | Good/Excellent
Commercial real estate	48,000	49,000
Commercial Real Estate Portfolio Segment | Satisfactory
Commercial real estate	16,049,000	16,938,000
Commercial Real Estate Portfolio Segment | Pass
Commercial real estate	3,599,000	2,126,000
Commercial Real Estate Portfolio Segment | Special Mention
Commercial real estate	17,000	806,000
Commercial Real Estate Portfolio Segment | Substandard
Commercial real estate	1,065,000	1,348,000
Commercial Real Estate Portfolio Segment | Doubtful
Commercial real estate	217,000	221,000
Commercial Real Estate Portfolio Segment | Total
Commercial real estate	21,389,000	21,488,000
Commercial | Commercial And Industrial | Good/Excellent
Total commercial loans	250,000	260,000
Commercial | Commercial And Industrial | Satisfactory
Total commercial loans	423,000	331,000
Commercial | Commercial And Industrial | Pass
Total commercial loans	0	9,000
Commercial | Commercial And Industrial | Special Mention
Total commercial loans	19,000	38,000
Commercial | Commercial And Industrial | Substandard
Total commercial loans	217,000	252,000
Commercial | Commercial And Industrial | Doubtful
Total commercial loans	0	0
Commercial | Commercial And Industrial | Total
Total commercial loans	909,000	890,000
SBA Loans | Commercial And Industrial | Good/Excellent
Total commercial loans	0
SBA Loans | Commercial And Industrial | Satisfactory
Total commercial loans	0
SBA Loans | Commercial And Industrial | Pass
Total commercial loans	19,000
SBA Loans | Commercial And Industrial | Special Mention
Total commercial loans	0
SBA Loans | Commercial And Industrial | Substandard
Total commercial loans	0
SBA Loans | Commercial And Industrial | Doubtful
Total commercial loans	0
SBA Loans | Commercial And Industrial | Total
Total commercial loans	19,000
SBA Loans | Commercial Real Estate Portfolio Segment
Commercial real estate	669,000	255,000
SBA Loans | Commercial Real Estate Portfolio Segment | Good/Excellent
Commercial real estate	0	0
SBA Loans | Commercial Real Estate Portfolio Segment | Satisfactory
Commercial real estate	588,000	2,000
SBA Loans | Commercial Real Estate Portfolio Segment | Pass
Commercial real estate	0	0
SBA Loans | Commercial Real Estate Portfolio Segment | Special Mention
Commercial real estate	0	160,000
SBA Loans | Commercial Real Estate Portfolio Segment | Substandard
Commercial real estate	81,000	93,000
SBA Loans | Commercial Real Estate Portfolio Segment | Doubtful
Commercial real estate	0	0
SBA Loans | Commercial Real Estate Portfolio Segment | Total
Commercial real estate	669,000	255,000
Asset Based | Commercial And Industrial | Good/Excellent
Total commercial loans	0	0
Asset Based | Commercial And Industrial | Satisfactory
Total commercial loans	549,000	742,000
Asset Based | Commercial And Industrial | Pass
Total commercial loans	152,000	198,000
Asset Based | Commercial And Industrial | Special Mention
Total commercial loans	0	0
Asset Based | Commercial And Industrial | Substandard
Total commercial loans	93,000	243,000
Asset Based | Commercial And Industrial | Doubtful
Total commercial loans	76,000	76,000
Asset Based | Commercial And Industrial | Total
Total commercial loans	870,000	1,259,000
Commercial Mortgages | Commercial Real Estate Portfolio Segment
Commercial real estate	11,671,000	11,385,000
Commercial Mortgages | Commercial Real Estate Portfolio Segment | Good/Excellent
Commercial real estate	0	0
Commercial Mortgages | Commercial Real Estate Portfolio Segment | Satisfactory
Commercial real estate	7,876,000	8,193,000
Commercial Mortgages | Commercial Real Estate Portfolio Segment | Pass
Commercial real estate	2,764,000	1,375,000
Commercial Mortgages | Commercial Real Estate Portfolio Segment | Special Mention
Commercial real estate	17,000	537,000
Commercial Mortgages | Commercial Real Estate Portfolio Segment | Substandard
Commercial real estate	797,000	1,059,000
Commercial Mortgages | Commercial Real Estate Portfolio Segment | Doubtful
Commercial real estate	217,000	221,000
Commercial Mortgages | Commercial Real Estate Portfolio Segment | Total
Commercial real estate	11,671,000	11,385,000
Construction | Commercial Real Estate Portfolio Segment
Commercial real estate	419,000	542,000
Construction | Commercial Real Estate Portfolio Segment | Good/Excellent
Commercial real estate	0	0
Construction | Commercial Real Estate Portfolio Segment | Satisfactory
Commercial real estate	419,000	542,000
Construction | Commercial Real Estate Portfolio Segment | Pass
Commercial real estate	0	0
Construction | Commercial Real Estate Portfolio Segment | Special Mention
Commercial real estate	0	0
Construction | Commercial Real Estate Portfolio Segment | Substandard
Commercial real estate	0	0
Construction | Commercial Real Estate Portfolio Segment | Doubtful
Commercial real estate	0	0
Construction | Commercial Real Estate Portfolio Segment | Total
Commercial real estate	419,000	542,000
Religious Organizations | Commercial Real Estate Portfolio Segment
Commercial real estate	8,630,000	9,306,000
Religious Organizations | Commercial Real Estate Portfolio Segment | Good/Excellent
Commercial real estate	48,000	49,000
Religious Organizations | Commercial Real Estate Portfolio Segment | Satisfactory
Commercial real estate	7,560,000	8,201,000
Religious Organizations | Commercial Real Estate Portfolio Segment | Pass
Commercial real estate	835,000	751,000
Religious Organizations | Commercial Real Estate Portfolio Segment | Special Mention
Commercial real estate	0	109,000
Religious Organizations | Commercial Real Estate Portfolio Segment | Substandard
Commercial real estate	187,000	196,000
Religious Organizations | Commercial Real Estate Portfolio Segment | Doubtful
Commercial real estate	0	0
Religious Organizations | Commercial Real Estate Portfolio Segment | Total
Commercial real estate	$ 8,630,000	$ 9,306,000