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Securities - Amortized Cost and Fair Value (Details) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 USD ($) security | Dec. 31, 2017 USD ($)
Securities |  |
Amortized Cost | $ 15,585 | $ 17,372
Gross Unrealized Gains | 94 | 170
Gross Unrealized Losses | (436) | (48)
Fair Value | 15,243 | 17,494
Federal agency mortgage-backed securities |  |
Securities |  |
Amortized Cost | 10,158 | 11,877
Gross Unrealized Gains | 94 | 168
Gross Unrealized Losses | (260) | (37)
Fair Value | $ 9,992 | 12,008
Number of securities held | security | 24 |
Estimated remaining term | 4 years 8 months 12 days |
Federal agency debt |  |
Securities |  |
Amortized Cost | $ 5,427 | 5,495
Gross Unrealized Gains |  | 2
Gross Unrealized Losses | (176) | (11)
Fair Value | $ 5,251 | $ 5,486
Number of securities held | security | 3 |
Estimated remaining term | 3 years 10 months 24 days |

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