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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, 2019 | Dec. 31, 2018
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Investment Securities |  |
Less than 12 months Fair Value | $ 18,766 | $ 18,186
Less than 12 months Unrealized Loss | (97) | (340)
12 months or more Fair Value | 19,112 | 50,327
12 months or more Unrealized Loss | (247) | (1,741)
Total Fair Value | 37,878 | 68,513
Total Unrealized Loss | (344) | (2,081)
Collateralized mortgage obligations |  |
Investment Securities |  |
Less than 12 months Fair Value | 11,792 | 1,625
Less than 12 months Unrealized Loss | (65) | (22)
12 months or more Fair Value | 7,330 | 17,546
12 months or more Unrealized Loss | (122) | (640)
Total Fair Value | 19,122 | 19,171
Total Unrealized Loss | (187) | (662)
Agency mortgage-backed securities |  |
Investment Securities |  |
Less than 12 months Fair Value | 4,577 | 3,399
Less than 12 months Unrealized Loss | (20) | (74)
12 months or more Fair Value | 10,918 | 21,417
12 months or more Unrealized Loss | (115) | (840)
Total Fair Value | 15,495 | 24,816
Total Unrealized Loss | (135) | (914)
Municipal securities |  |
Investment Securities |  |
Less than 12 months Fair Value | 1,806 | 13,162
Less than 12 months Unrealized Loss | (7) | (244)
12 months or more Fair Value | 864 | 8,415
12 months or more Unrealized Loss | (10) | (210)
Total Fair Value | 2,670 | 21,577
Total Unrealized Loss | (17) | (454)
U.S. Government agency securities |  |
Investment Securities |  |
Less than 12 months Fair Value | 591 |
Less than 12 months Unrealized Loss | (5) |
12 months or more Fair Value |  | 1,959
12 months or more Unrealized Loss |  | (40)
Total Fair Value | 591 | 1,959
Total Unrealized Loss | $ (5) | (40)
U.S. Treasury securities |  |
Investment Securities |  |
12 months or more Fair Value |  | 990
12 months or more Unrealized Loss |  | (11)
Total Fair Value |  | 990
Total Unrealized Loss |  | $ (11)

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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, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + 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=118939692&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 + Details
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