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2. Investment securities, Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value $ 36,155 $ 14,663
Less than 12 Months, Unrealized Losses 507 84
12 Months or More, Fair Value 10,123 14,758
12 Months or More, Unrealized Losses 209 210
Total, Fair Value 46,278 29,421
Total, Unrealized Losses 716 294
Mortgage-backed securities    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 15,594 7,891
Less than 12 Months, Unrealized Losses 290 45
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
Total, Fair Value 15,594 7,891
Total, Unrealized Losses 290 45
U.S. Government sponsored enterprises    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 10,120 3,074
Less than 12 Months, Unrealized Losses 94 13
12 Months or More, Fair Value 9,562 10,828
12 Months or More, Unrealized Losses 180 142
Total, Fair Value 19,682 13,902
Total, Unrealized Losses 274 155
State and political subdivisions    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 10,441 2,198
Less than 12 Months, Unrealized Losses 123 4
12 Months or More, Fair Value 561 3,930
12 Months or More, Unrealized Losses 29 68
Total, Fair Value 11,002 6,128
Total, Unrealized Losses $ 152 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