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Fair Value - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
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 | 12,008,000 | 11,214,000
Recurring Basis | Federal agency debt |  |
Fair Value |  |
Securities available-for-sale, at fair value | 5,486,000 | 1,988,000
Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Federal agency debt |  |
Fair Value |  |
Securities available-for-sale, at fair value | 1,976,000 | 1,988,000
Recurring Basis | Significant Other Observable Inputs (Level 2) | Federal agency mortgage-backed securities |  |
Fair Value |  |
Securities available-for-sale, at fair value | 12,008,000 | $ 11,214,000
Recurring Basis | Significant Other Observable Inputs (Level 2) | Federal agency debt |  |
Fair Value |  |
Securities available-for-sale, at fair value | $ 3,510,000 |

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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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- Definition Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1. + 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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- Definition Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy. + 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 (c)(3) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy. + 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 (c)(3) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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