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Fair Value - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Fair Value |  |  |  |  |
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 | Available-for-sale Securities |  |  |  |  |
Fair Value |  |  |  |  |
Securities available-for-sale, at fair value | 9,992,000 |  | 9,992,000 |  | $ 12,008,000
Recurring Basis | Federal agency debt | Available-for-sale Securities |  |  |  |  |
Fair Value |  |  |  |  |
Securities available-for-sale, at fair value | 5,251,000 |  | 5,251,000 |  | 5,486,000
Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Federal agency debt | Available-for-sale Securities |  |  |  |  |
Fair Value |  |  |  |  |
Securities available-for-sale, at fair value | 1,972,000 |  | 1,972,000 |  | 1,976,000
Recurring Basis | Significant Other Observable Inputs (Level 2) | Federal agency mortgage-backed securities | Available-for-sale Securities |  |  |  |  |
Fair Value |  |  |  |  |
Securities available-for-sale, at fair value | 9,992,000 |  | 9,992,000 |  | 12,008,000
Recurring Basis | Significant Other Observable Inputs (Level 2) | Federal agency debt | Available-for-sale Securities |  |  |  |  |
Fair Value |  |  |  |  |
Securities available-for-sale, at fair value | $ 3,279,000 |  | $ 3,279,000 |  | $ 3,510,000

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- Definition Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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