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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) $ in Thousands | Jun. 30, 2019 USD ($) security | Dec. 31, 2018 USD ($) security
--- | --- | ---
Investment Securities |  |
Less than 12 months Fair Value | $ 332 | $ 18,186
Less than 12 months Unrealized Loss | (1) | (340)
12 months or more Fair Value | 38,684 | 50,327
12 months or more Unrealized Loss | (448) | (1,741)
Total Fair Value | 39,016 | 68,513
Total Unrealized Loss | $ (449) | $ (2,081)
Number of securities continuous unrealized loss position more than twelve months | security | 92 | 142
Collateralized mortgage obligations |  |
Investment Securities |  |
Less than 12 months Fair Value | $ 332 | $ 1,625
Less than 12 months Unrealized Loss | (1) | (22)
12 months or more Fair Value | 14,232 | 17,546
12 months or more Unrealized Loss | (173) | (640)
Total Fair Value | 14,564 | 19,171
Total Unrealized Loss | (174) | (662)
Agency mortgage-backed securities |  |
Investment Securities |  |
Less than 12 months Fair Value |  | 3,399
Less than 12 months Unrealized Loss |  | (74)
12 months or more Fair Value | 16,906 | 21,417
12 months or more Unrealized Loss | (225) | (840)
Total Fair Value | 16,906 | 24,816
Total Unrealized Loss | (225) | (914)
Municipal securities |  |
Investment Securities |  |
Less than 12 months Fair Value |  | 13,162
Less than 12 months Unrealized Loss |  | (244)
12 months or more Fair Value | 4,551 | 8,415
12 months or more Unrealized Loss | (45) | (210)
Total Fair Value | 4,551 | 21,577
Total Unrealized Loss | (45) | (454)
U.S. Government agency securities |  |
Investment Securities |  |
12 months or more Fair Value | 1,997 | 1,959
12 months or more Unrealized Loss | (2) | (40)
Total Fair Value | 1,997 | 1,959
Total Unrealized Loss | (2) | (40)
U.S. Treasury securities |  |
Investment Securities |  |
12 months or more Fair Value | 998 | 990
12 months or more Unrealized Loss | (3) | (11)
Total Fair Value | 998 | 990
Total Unrealized Loss | $ (3) | $ (11)

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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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