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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 | Mar. 31, 2019 USD ($) security | Dec. 31, 2018 USD ($) security
--- | --- | ---
Investment Securities |  |
Less than 12 months Fair Value |  | $ 18,186
Less than 12 months Unrealized Loss |  | (340)
12 months or more Fair Value | $ 52,337 | 50,327
12 months or more Unrealized Loss | (1,111) | (1,741)
Total Fair Value | 52,337 | 68,513
Total Unrealized Loss | $ (1,111) | $ (2,081)
Number of securities continuous unrealized loss position more than twelve months | security | 111 | 142
Collateralized mortgage obligations |  |
Investment Securities |  |
Less than 12 months Fair Value |  | $ 1,625
Less than 12 months Unrealized Loss |  | (22)
12 months or more Fair Value | $ 17,280 | 17,546
12 months or more Unrealized Loss | (460) | (640)
Total Fair Value | 17,280 | 19,171
Total Unrealized Loss | (460) | (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 | 24,611 | 21,417
12 months or more Unrealized Loss | (518) | (840)
Total Fair Value | 24,611 | 24,816
Total Unrealized Loss | (518) | (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 | 7,464 | 8,415
12 months or more Unrealized Loss | (115) | (210)
Total Fair Value | 7,464 | 21,577
Total Unrealized Loss | (115) | (454)
U.S. Government agency securities |  |
Investment Securities |  |
12 months or more Fair Value | 1,988 | 1,959
12 months or more Unrealized Loss | (11) | (40)
Total Fair Value | 1,988 | 1,959
Total Unrealized Loss | (11) | (40)
U.S. Treasury securities |  |
Investment Securities |  |
12 months or more Fair Value | 994 | 990
12 months or more Unrealized Loss | (7) | (11)
Total Fair Value | 994 | 990
Total Unrealized Loss | $ (7) | $ (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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