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Securities - Securities in Unrealized Loss Position (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 USD ($) security | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) security | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) security
Securities |  |  |  |  |
Number of securities held with unrealized losses | security | 5 |  | 5 |  | 10
Estimated Fair Value |  |  |  |  |
Less than 12 months | $ 1,995 |  | $ 1,995 |  | $ 4,628
12 months or more | 4,054 |  | 4,054 |  | 7,448
Total | 6,049 |  | 6,049 |  | 12,076
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (1) |  | (1) |  | (35)
12 months or more | (6) |  | (6) |  | (223)
Total | (7) |  | (7) |  | (258)
Securities pledged to secure public deposits | $ 0 |  | $ 0 |  | $ 0
Securities pledged to secure public deposits | us-gaap:AssetPledgedAsCollateralMember |  | us-gaap:AssetPledgedAsCollateralMember |  | us-gaap:AssetPledgedAsCollateralMember
Securities of any one issuer, other than U.S. Government, greater than 10% of stockholders' equity |  |  | 0.00% |  | 0.00%
Sales of securities | $ 0 | $ 0 | $ 0 | $ 0 |
Federal agency mortgage-backed securities |  |  |  |  |
Estimated Fair Value |  |  |  |  |
Less than 12 months |  |  |  |  | $ 2,649
12 months or more | 4,054 |  | 4,054 |  | 4,213
Total | 4,054 |  | 4,054 |  | 6,862
Gross Unrealized Losses |  |  |  |  |
Less than 12 months |  |  |  |  | (25)
12 months or more | (6) |  | (6) |  | (130)
Total | (6) |  | (6) |  | (155)
Federal agency debt |  |  |  |  |
Estimated Fair Value |  |  |  |  |
Less than 12 months | 1,995 |  | 1,995 |  | 1,979
12 months or more |  |  |  |  | 3,235
Total | 1,995 |  | 1,995 |  | 5,214
Gross Unrealized Losses |  |  |  |  |
Less than 12 months | (1) |  | (1) |  | (10)
12 months or more |  |  |  |  | (93)
Total | $ (1) |  | $ (1) |  | $ (103)

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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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