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2. Investment securities, Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value $ 13,738 $ 14,663
Less than 12 Months, Unrealized Losses 116 84
12 Months or More, Fair Value 10,267 14,758
12 Months or More, Unrealized Losses 184 210
Total, Fair Value 24,005 29,421
Total, Unrealized Losses 300 294
Mortgage-backed securities    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 5,795 7,891
Less than 12 Months, Unrealized Losses 49 45
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
Total, Fair Value 5,795 7,891
Total, Unrealized Losses 49 45
U.S. Government sponsored enterprises    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 7,517 3,074
Less than 12 Months, Unrealized Losses 66 13
12 Months or More, Fair Value 9,685 10,828
12 Months or More, Unrealized Losses 174 142
Total, Fair Value 17,202 13,902
Total, Unrealized Losses 240 155
State and political subdivisions    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 426 2,198
Less than 12 Months, Unrealized Losses 1 4
12 Months or More, Fair Value 582 3,930
12 Months or More, Unrealized Losses 10 68
Total, Fair Value 1,008 6,128
Total, Unrealized Losses $ 11 72
Corporate bonds    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value   1,500
Less than 12 Months, Unrealized Losses   22
12 Months or More, Fair Value   0
12 Months or More, Unrealized Losses   0
Total, Fair Value   1,500
Total, Unrealized Losses   $ 22