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Fair Value - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Fair Value |  |
Transfer between level 1 and level 2 | $ 0 | $ 0
Transfer between level 2 and level 1 | 0 | 0
Transfer into level 3 | 0 | 0
Transfer out of level 3 | 0 | 0
Recurring Basis | Federal agency mortgage-backed securities |  |
Fair Value |  |
Securities available-for-sale, at fair value | 9,508 | 12,008
Recurring Basis | Federal agency debt |  |
Fair Value |  |
Securities available-for-sale, at fair value | 5,214 | 5,486
Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Federal agency debt |  |
Fair Value |  |
Securities available-for-sale, at fair value | 1,979 | 1,976
Recurring Basis | Significant Other Observable Inputs (Level 2) | Federal agency mortgage-backed securities |  |
Fair Value |  |
Securities available-for-sale, at fair value | 9,508 | 12,008
Recurring Basis | Significant Other Observable Inputs (Level 2) | Federal agency debt |  |
Fair Value |  |
Securities available-for-sale, at fair value | $ 3,235 | $ 3,510

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