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2. Investment securities, Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value $ 9,008 $ 14,663
Less than 12 Months, Unrealized Losses 55 84
12 Months or More, Fair Value 11,280 14,758
12 Months or More, Unrealized Losses 126 210
Total, Fair Value 20,288 29,421
Total, Unrealized Losses 181 294
Mortgage-backed securities    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 4,277 7,891
Less than 12 Months, Unrealized Losses 23 45
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
Total, Fair Value 4,277 7,891
Total, Unrealized Losses 23 45
U.S. Government sponsored enterprises    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 0 3,074
Less than 12 Months, Unrealized Losses 0 13
12 Months or More, Fair Value 10,684 10,828
12 Months or More, Unrealized Losses 126 142
Total, Fair Value 10,684 13,902
Total, Unrealized Losses 126 155
State and political subdivisions    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 3,749 2,198
Less than 12 Months, Unrealized Losses 14 4
12 Months or More, Fair Value 596 3,930
12 Months or More, Unrealized Losses 0 68
Total, Fair Value 4,345 6,128
Total, Unrealized Losses 14 72
Corporate bonds    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 982 1,500
Less than 12 Months, Unrealized Losses 18 22
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
Total, Fair Value 982 1,500
Total, Unrealized Losses $ 18 $ 22