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2. Investment securities, Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value $ 14,663 $ 3,999
Less than 12 Months, Unrealized Losses 84 6
12 Months or More, Fair Value 14,758 28,336
12 Months or More, Unrealized Losses 210 426
Total, Fair Value 29,421 32,335
Total, Unrealized Losses 294 432
Mortgage-backed securities    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 7,891 436
Less than 12 Months, Unrealized Losses 45 1
12 Months or More, Fair Value 0 2,963
12 Months or More, Unrealized Losses 0 51
Total, Fair Value 7,891 3,399
Total, Unrealized Losses 45 52
U.S. Government sponsored enterprises    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 3,074 2,996
Less than 12 Months, Unrealized Losses 13 4
12 Months or More, Fair Value 10,828 9,850
12 Months or More, Unrealized Losses 142 132
Total, Fair Value 13,902 12,846
Total, Unrealized Losses 155 136
State and political subdivisions    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 2,198 567
Less than 12 Months, Unrealized Losses 4 1
12 Months or More, Fair Value 3,930 14,998
12 Months or More, Unrealized Losses 68 225
Total, Fair Value 6,128 15,565
Total, Unrealized Losses 72 226
Corporate bonds    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 1,500 0
Less than 12 Months, Unrealized Losses 22 0
12 Months or More, Fair Value 0 525
12 Months or More, Unrealized Losses 0 18
Total, Fair Value 1,500 525
Total, Unrealized Losses $ 22 $ 18