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2. Investment securities, Fair Value Measurements (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Estimated Fair Value $ 229,321 $ 249,946
Mortgage-backed securities    
Estimated Fair Value 53,609 67,585
Level 1 valuation 0 0
Level 2 valuation 53,609 67,585
Level 3 valuation 0 0
U.S. Government sponsored enterprises    
Estimated Fair Value 40,380 38,222
Level 1 valuation 0 0
Level 2 valuation 40,380 38,222
Level 3 valuation 0 0
State and political subdivisions    
Estimated Fair Value 133,570 141,856
Level 1 valuation 0 0
Level 2 valuation 133,570 141,856
Level 3 valuation 0 0
Corporate bonds    
Estimated Fair Value 1,512 1,533
Level 1 valuation 0 0
Level 2 valuation 1,512 1,533
Level 3 valuation 0 0
Trust preferred securities    
Estimated Fair Value 250 750
Level 1 valuation 0 0
Level 2 valuation 0 0
Level 3 valuation $ 250 $ 750