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2. Investment Securities (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Securities available for sale    
Cost $ 8,434 $ 28,640
Unrealized Gains 0 0
Unrealized Losses 190 25
Market Value 8,244 28,615 [1]
U. S. Treasury and agency obligations [Member]    
Securities held to maturity    
Cost 123 125
Market Value 123 125
Securities available for sale    
Unrealized Gains 0 0
Unrealized Losses 0 0
U. S. Treasuries [Member]    
Securities available for sale    
Cost   19,998
Unrealized Gains   0
Unrealized Losses   0
Market Value   19,998
Government Sponsored Enterprises [Member]    
Securities available for sale    
Cost 7,999 7,999
Unrealized Gains 0 0
Unrealized Losses 179 19
Market Value 7,820 7,980
Mortgage-backed securities [Member]    
Securities available for sale    
Cost 435 508
Unrealized Gains 0 0
Unrealized Losses 11 6
Market Value $ 424 502
Marketable Equities [Member]    
Securities available for sale    
Cost [2]   135
Unrealized Gains [2]   0
Unrealized Losses [2]   0
Market Value [2]   $ 135
[1] 2017 Derived from audited consolidated financial statements.
[2] Transferred to other investments on January 1, 2018 upon adoption of ASU 2016-01.