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2. Investment securities, Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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- Definition Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
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- Definition Amount of unrealized loss on securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
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