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2. Investment securities, Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value $ 41,720 $ 3,999
Less than 12 Months, Unrealized Losses 521 6
12 Months or More, Fair Value 16,455 28,336
12 Months or More, Unrealized Losses 348 426
Total, Fair Value 58,175 32,335
Total, Unrealized Losses 869 432
Mortgage-backed securities    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 4,705 436
Less than 12 Months, Unrealized Losses 9 1
12 Months or More, Fair Value 0 2,963
12 Months or More, Unrealized Losses 0 51
Total, Fair Value 4,705 3,399
Total, Unrealized Losses 9 52
U.S. Government sponsored enterprises    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 6,462 2,996
Less than 12 Months, Unrealized Losses 53 4
12 Months or More, Fair Value 9,316 9,850
12 Months or More, Unrealized Losses 90 132
Total, Fair Value 15,778 12,846
Total, Unrealized Losses 143 136
State and political subdivisions    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 30,553 567
Less than 12 Months, Unrealized Losses 459 1
12 Months or More, Fair Value 6,612 14,998
12 Months or More, Unrealized Losses 253 225
Total, Fair Value 37,165 15,565
Total, Unrealized Losses 712 226
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 527 525
12 Months or More, Unrealized Losses 5 18
Total, Fair Value 527 525
Total, Unrealized Losses $ 5 $ 18