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2. Investment securities, Fair Value Measurements (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Estimated Fair Value $ 249,946 $ 268,530
Mortgage-backed securities    
Estimated Fair Value 67,585 77,887
Level 1 valuation 0 0
Level 2 valuation 67,585 77,887
Level 3 valuation 0 0
U.S. Government sponsored enterprises    
Estimated Fair Value 38,222 38,417
Level 1 valuation 0 0
Level 2 valuation 38,222 38,417
Level 3 valuation 0 0
State and political subdivisions    
Estimated Fair Value 141,856 148,245
Level 1 valuation 0 0
Level 2 valuation 141,856 148,245
Level 3 valuation 0 0
Corporate bonds    
Estimated Fair Value 1,533 1,906
Level 1 valuation 0 0
Level 2 valuation 1,533 1,906
Level 3 valuation 0 0
Trust preferred securities    
Estimated Fair Value 750 750
Level 1 valuation 0 0
Level 2 valuation 0 0
Level 3 valuation $ 750 750
Equity securities    
Estimated Fair Value   1,325
Level 1 valuation   1,325
Level 2 valuation   0
Level 3 valuation   $ 0