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2. Investment securities, Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Investment securities with continuous unrealized loss position |  |
Less than 12 Months, Fair Value | $ 16,509 | $ 36,155
Less than 12 Months, Unrealized Losses | 144 | 507
12 Months or More, Fair Value | 16,540 | 10,123
12 Months or More, Unrealized Losses | 223 | 209
Total, Fair Value | 33,049 | 46,278
Total, Unrealized Losses | 367 | 716
Mortgage-backed securities |  |
Investment securities with continuous unrealized loss position |  |
Less than 12 Months, Fair Value | 10,540 | 15,594
Less than 12 Months, Unrealized Losses | 95 | 290
12 Months or More, Fair Value | 4,792 | 0
12 Months or More, Unrealized Losses | 101 | 0
Total, Fair Value | 15,332 | 15,594
Total, Unrealized Losses | 196 | 290
U.S. Government sponsored enterprises |  |
Investment securities with continuous unrealized loss position |  |
Less than 12 Months, Fair Value | 5,424 | 10,120
Less than 12 Months, Unrealized Losses | 47 | 94
12 Months or More, Fair Value | 10,762 | 9,562
12 Months or More, Unrealized Losses | 104 | 180
Total, Fair Value | 16,186 | 19,682
Total, Unrealized Losses | 151 | 274
State and political subdivisions |  |
Investment securities with continuous unrealized loss position |  |
Less than 12 Months, Fair Value | 545 | 10,441
Less than 12 Months, Unrealized Losses | 2 | 123
12 Months or More, Fair Value | 986 | 561
12 Months or More, Unrealized Losses | 18 | 29
Total, Fair Value | 1,531 | 11,002
Total, Unrealized Losses | $ 20 | $ 152

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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=82897076&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=82897076&loc=d3e27290-111563 + Details
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