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Fair Value Measurements, Quantitative Information (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |
Available-for-sale debt securities | $ 240,426 | $ 254,782
Impaired Loans [Member] | Appraised Collateral Values [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |
Available-for-sale debt securities | $ 6,281 | $ 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 21 days | 11 months 4 days
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 | 0.2006 | 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 | 0.0873 | 0.0835
Other Real Estate Owned [Member] | Appraised Collateral Values [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Abstract] |  |
Available-for-sale debt securities | $ 520 | $ 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 | 0.2634 | 0.2626

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