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Investment Securities - Gross Unrealized Losses and Fair Value Aggregated by Investment Category and Length of Time in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Investment Securities |  |
Less than 12 months Fair Value | $ 20,188 | $ 62,294
Less than 12 months Unrealized Loss | (198) | (1,155)
12 months or more Fair Value | 40,641 | 10,589
12 months or more Unrealized Loss | (1,084) | (293)
Total Fair Value | 60,829 | 72,883
Total Unrealized Loss | (1,282) | (1,448)
Collaterized mortgage obligations |  |
Investment Securities |  |
Less than 12 months Fair Value | 6,531 | 18,244
Less than 12 months Unrealized Loss | (63) | (174)
12 months or more Fair Value | 15,678 | 8,775
12 months or more Unrealized Loss | (507) | (248)
Total Fair Value | 22,209 | 27,019
Total Unrealized Loss | (570) | (422)
Agency mortgage-backed securities |  |
Investment Securities |  |
Less than 12 months Fair Value | 6,802 | 24,850
Less than 12 months Unrealized Loss | (80) | (401)
12 months or more Fair Value | 18,218 | 828
12 months or more Unrealized Loss | (420) | (28)
Total Fair Value | 25,020 | 25,678
Total Unrealized Loss | (500) | (429)
Municipal securities |  |
Investment Securities |  |
Less than 12 months Fair Value | 2,396 | 19,200
Less than 12 months Unrealized Loss | (11) | (580)
12 months or more Fair Value | 6,230 |
12 months or more Unrealized Loss | (148) |
Total Fair Value | 8,626 | 19,200
Total Unrealized Loss | (159) | (580)
U.S. Government agency securities |  |
Investment Securities |  |
Less than 12 months Fair Value | 2,965 |
Less than 12 months Unrealized Loss | (37) |
12 months or more Fair Value | 515 | 986
12 months or more Unrealized Loss | (9) | (17)
Total Fair Value | 3,480 | 986
Total Unrealized Loss | (46) | $ (17)
U.S. Treasury securities |  |
Investment Securities |  |
Less than 12 months Fair Value | 1,494 |
Less than 12 months Unrealized Loss | (7) |
Total Fair Value | 1,494 |
Total Unrealized Loss | $ (7) |

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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