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2. Investment securities, Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value $ 20,359 $ 3,999
Less than 12 Months, Unrealized Losses 208 6
12 Months or More, Fair Value 16,258 28,336
12 Months or More, Unrealized Losses 278 426
Total, Fair Value 36,617 32,335
Total, Unrealized Losses 486 432
Mortgage-backed securities    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 2,278 436
Less than 12 Months, Unrealized Losses 18 1
12 Months or More, Fair Value 0 2,963
12 Months or More, Unrealized Losses 0 51
Total, Fair Value 2,278 3,399
Total, Unrealized Losses 18 52
U.S. Government sponsored enterprises    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 2,319 2,996
Less than 12 Months, Unrealized Losses 20 4
12 Months or More, Fair Value 9,064 9,850
12 Months or More, Unrealized Losses 109 132
Total, Fair Value 11,383 12,846
Total, Unrealized Losses 129 136
State and political subdivisions    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 15,762 567
Less than 12 Months, Unrealized Losses 170 1
12 Months or More, Fair Value 6,668 14,998
12 Months or More, Unrealized Losses 168 225
Total, Fair Value 22,430 15,565
Total, Unrealized Losses 338 226
Corporate bonds    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 0 0
Less than 12 Months, Unrealized Losses 0 0
12 Months or More, Fair Value 526 525
12 Months or More, Unrealized Losses 1 18
Total, Fair Value 526 525
Total, Unrealized Losses $ 1 $ 18