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Available-for-Sale Securities (Details 2) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Summary of securities with unrealized losses |  |
Less than 12 Months, Fair Value | $ 41,785 | $ 51,483
Less than 12 Months, Unrealized Losses | (350) | (698)
12 Months or Longer, Fair Value | 17,558 | 703
12 Months or Longer, Unrealized Losses | (427) | (29)
Total Fair Value | 59,343 | 52,186
Total Unrealized Losses | (777) | (727)
U.S. Treasury and Government agencies [Member] |  |
Summary of securities with unrealized losses |  |
Less than 12 Months, Fair Value | 5,675 | 6,044
Less than 12 Months, Unrealized Losses | (27) | (52)
12 Months or Longer, Fair Value | 2,559 |
12 Months or Longer, Unrealized Losses | (42) |
Total Fair Value | 8,234 | 6,044
Total Unrealized Losses | (69) | (52)
Mortgage-backed securities [Member] |  |
Summary of securities with unrealized losses |  |
Less than 12 Months, Fair Value | 35,205 | 44,344
Less than 12 Months, Unrealized Losses | (319) | (607)
12 Months or Longer, Fair Value | 14,673 | 703
12 Months or Longer, Unrealized Losses | (371) | (29)
Total Fair Value | 49,878 | 45,047
Total Unrealized Losses | (690) | (636)
State and political subdivisions [Member] |  |
Summary of securities with unrealized losses |  |
Less than 12 Months, Fair Value | 905 | 1,095
Less than 12 Months, Unrealized Losses | (4) | (39)
12 Months or Longer, Fair Value | 326 |
12 Months or Longer, Unrealized Losses | (14) |
Total Fair Value | 1,231 | 1,095
Total Unrealized Losses | $ (18) | $ (39)

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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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