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Fair Value Measurements, Quantitative Information (Details) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |
Available-for-sale debt securities | $ 250,025 | $ 254,782
Impaired Loans [Member] | Appraised Collateral Values [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |
Available-for-sale debt securities | $ 3,470 | $ 1,569
Impaired Loans [Member] | Appraised Collateral Values [Member] | Minimum [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |
Holding period | 0 months | 6 months
Impaired Loans [Member] | Appraised Collateral Values [Member] | Maximum [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |
Holding period | 12 months | 12 months
Impaired Loans [Member] | Appraised Collateral Values [Member] | Weighted Average [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |
Holding period | 11 months 13 days | 11 months
Impaired Loans [Member] | Appraised Collateral Values [Member] | Discount for Time Since Appraisal [Member] | Minimum [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |
Available-for-sale, Measurement input | 0 | 0
Impaired Loans [Member] | Appraised Collateral Values [Member] | Discount for Time Since Appraisal [Member] | Maximum [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |
Available-for-sale, Measurement input | 1 | 1
Impaired Loans [Member] | Appraised Collateral Values [Member] | Discount for Time Since Appraisal [Member] | Weighted Average [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |
Available-for-sale, Measurement input | 0.2732 | 0.3083
Impaired Loans [Member] | Appraised Collateral Values [Member] | Selling Costs [Member] | Minimum [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |
Available-for-sale, Measurement input | 0.05 | 0.05
Impaired Loans [Member] | Appraised Collateral Values [Member] | Selling Costs [Member] | Maximum [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |
Available-for-sale, Measurement input | 0.11 | 0.09
Impaired Loans [Member] | Appraised Collateral Values [Member] | Selling Costs [Member] | Weighted Average [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |
Available-for-sale, Measurement input | 0.0788 | 0.0835
Other Real Estate Owned [Member] | Appraised Collateral Values [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |
Available-for-sale debt securities | $ 326 | $ 1,024
Other Real Estate Owned [Member] | Appraised Collateral Values [Member] | Discount for Time Since Appraisal [Member] | Minimum [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |
Available-for-sale, Measurement input | 0.25 | 0.15
Other Real Estate Owned [Member] | Appraised Collateral Values [Member] | Discount for Time Since Appraisal [Member] | Maximum [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |
Available-for-sale, Measurement input | 0.35 | 0.65
Other Real Estate Owned [Member] | Appraised Collateral Values [Member] | Discount for Time Since Appraisal [Member] | Weighted Average [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |
Available-for-sale, Measurement input | 0.2745 | 0.2626

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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