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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, 2018 | Dec. 31, 2017
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Investment Securities |  |
Less than 12 months Fair Value | $ 18,186 | $ 20,188
Less than 12 months Unrealized Loss | (340) | (198)
12 months or more Fair Value | 50,327 | 40,641
12 months or more Unrealized Loss | (1,741) | (1,084)
Total Fair Value | 68,513 | 60,829
Total Unrealized Loss | (2,081) | (1,282)
Collateralized mortgage obligations |  |
Investment Securities |  |
Less than 12 months Fair Value | 1,625 | 6,531
Less than 12 months Unrealized Loss | (22) | (63)
12 months or more Fair Value | 17,546 | 15,678
12 months or more Unrealized Loss | (640) | (507)
Total Fair Value | 19,171 | 22,209
Total Unrealized Loss | (662) | (570)
Agency mortgage-backed securities. |  |
Investment Securities |  |
Less than 12 months Fair Value | 3,399 | 6,802
Less than 12 months Unrealized Loss | (74) | (80)
12 months or more Fair Value | 21,417 | 18,218
12 months or more Unrealized Loss | (840) | (420)
Total Fair Value | 24,816 | 25,020
Total Unrealized Loss | (914) | (500)
Municipal securities |  |
Investment Securities |  |
Less than 12 months Fair Value | 13,162 | 2,396
Less than 12 months Unrealized Loss | (244) | (11)
12 months or more Fair Value | 8,415 | 6,230
12 months or more Unrealized Loss | (210) | (148)
Total Fair Value | 21,577 | 8,626
Total Unrealized Loss | (454) | (159)
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 | 1,959 | 515
12 months or more Unrealized Loss | (40) | (9)
Total Fair Value | 1,959 | 3,480
Total Unrealized Loss | (40) | (46)
U.S. Treasury securities |  |
Investment Securities |  |
Less than 12 months Fair Value |  | 1,494
Less than 12 months Unrealized Loss |  | (7)
12 months or more Fair Value | 990 |
12 months or more Unrealized Loss | (11) |
Total Fair Value | 990 | 1,494
Total Unrealized Loss | $ (11) | $ (7)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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