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Investment Securities - Components of Investment Securities Gains and Losses (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Available for sale securities: |  |  |
Gains realized on sales | $ 49,000 | $ 6,000 | $ 253,000
Losses realized on sales | (8,000) | (46,000) |
Other investment securities: |  |  |
Fair value adjustments, net | 20,000 |  | 2,000
Investment securities (losses) gains, net | $ 61,000 | $ (40,000) | $ 255,000

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- Definition Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563 + Details
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