5. Investment Securities: Schedule of Available-for-sale Securities Reconciliation (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Available-for-sale Securities, Amortized Cost Basis	$ 4,781,000	$ 5,218,000
Available-for-sale Securities, Gross Unrealized Gain	10,000	21,000
Available-for-sale Securities, Gross Unrealized Loss	(204,000)	(94,000)
Investment securities available-for-sale, at fair value	4,587,304	5,144,707
Available-for-sale Securities, Gross Unrealized Loss	204,000	94,000
Thousand
Investment securities available-for-sale, at fair value	4,587,000	5,145,000
US Government Agencies Debt Securiities
Available-for-sale Securities, Amortized Cost Basis	2,349,000	2,349,000
Available-for-sale Securities, Gross Unrealized Gain	0	0
Available-for-sale Securities, Gross Unrealized Loss	(116,000)	(76,000)
Investment securities available-for-sale, at fair value	2,233,000	2,273,000
Available-for-sale Securities, Gross Unrealized Loss	116,000	76,000
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Available-for-sale Securities, Amortized Cost Basis	2,432,000	2,737,000
Available-for-sale Securities, Gross Unrealized Gain	10,000	21,000
Available-for-sale Securities, Gross Unrealized Loss	(88,000)	(18,000)
Investment securities available-for-sale, at fair value	2,354,000	2,740,000
Available-for-sale Securities, Gross Unrealized Loss	$ 88,000	18,000
Money Market Funds
Available-for-sale Securities, Amortized Cost Basis		132,000
Available-for-sale Securities, Gross Unrealized Gain		0
Available-for-sale Securities, Gross Unrealized Loss		0
Investment securities available-for-sale, at fair value		132,000
Available-for-sale Securities, Gross Unrealized Loss		$ 0