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Fair Value - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Fair Value Pending Completion |  |  |  |  |
Transfer between level 1 and level 2 | $ 0 | $ 0 | $ 0 | $ 0 |
Transfer between level 2 and level 1 | 0 | 0 | 0 | 0 |
Transfer into level 3 | 0 | 0 | 0 | 0 |
Transfer out of level 3 | 0 | $ 0 | 0 | $ 0 |
Recurring Basis | Federal agency mortgage-backed securities |  |  |  |  |
Fair Value Pending Completion |  |  |  |  |
Securities available-for-sale, at fair value | 8,875 |  | 8,875 |  | $ 9,508
Recurring Basis | Federal agency debt |  |  |  |  |
Fair Value Pending Completion |  |  |  |  |
Securities available-for-sale, at fair value | 5,235 |  | 5,235 |  | 5,214
Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Federal agency debt |  |  |  |  |
Fair Value Pending Completion |  |  |  |  |
Securities available-for-sale, at fair value | 1,995 |  | 1,995 |  | 1,979
Recurring Basis | Significant Other Observable Inputs (Level 2) | Federal agency mortgage-backed securities |  |  |  |  |
Fair Value Pending Completion |  |  |  |  |
Securities available-for-sale, at fair value | 8,875 |  | 8,875 |  | 9,508
Recurring Basis | Significant Other Observable Inputs (Level 2) | Federal agency debt |  |  |  |  |
Fair Value Pending Completion |  |  |  |  |
Securities available-for-sale, at fair value | $ 3,240 |  | $ 3,240 |  | $ 3,235

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