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Fair Value Measurements (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Assets - Beginning balance | $ 1,761 | $ 1,832
Realized loss included in earnings - net mortgage banking derivatives | 8 | (71)
Assets - Ending balance | 1,769 | 1,761
Liabilities - Beginning balance | 10 | 55
Realized loss included in earnings - net mortgage banking derivatives | 74 | (45)
Liabilities - Ending balance | 84 | 10
Investment Securities [Member] |  |
Assets - Beginning balance | 1,718 | 1,718
Assets - Ending balance | 1,718 | 1,718
Mortgage Banking Derivatives [Member] |  |
Assets - Beginning balance | 43 | 114
Realized loss included in earnings - net mortgage banking derivatives | 8 | (71)
Assets - Ending balance | 51 | 43
Liabilities - Beginning balance | 10 | 55
Realized loss included in earnings - net mortgage banking derivatives | 74 | (45)
Liabilities - Ending balance | $ 84 | $ 10

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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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)(1) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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