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2. Investment securities, Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value $ 22,160 $ 36,155
Less than 12 Months, Unrealized Losses 175 507
12 Months or More, Fair Value 22,827 10,123
12 Months or More, Unrealized Losses 434 209
Total, Fair Value 44,987 46,278
Total, Unrealized Losses 609 716
Mortgage-backed securities    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 8,701 15,594
Less than 12 Months, Unrealized Losses 75 290
12 Months or More, Fair Value 11,259 0
12 Months or More, Unrealized Losses 254 0
Total, Fair Value 19,960 15,594
Total, Unrealized Losses 329 290
U.S. Government sponsored enterprises    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 12,661 10,120
Less than 12 Months, Unrealized Losses 98 94
12 Months or More, Fair Value 10,067 9,562
12 Months or More, Unrealized Losses 166 180
Total, Fair Value 22,728 19,682
Total, Unrealized Losses 264 274
State and political subdivisions    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 798 10,441
Less than 12 Months, Unrealized Losses 2 123
12 Months or More, Fair Value 1,501 561
12 Months or More, Unrealized Losses 14 29
Total, Fair Value 2,299 11,002
Total, Unrealized Losses $ 16 $ 152