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Note 2 - Fair Value of Financial Instruments - Level 3 Fair Value Measurements (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Income Approach Valuation Technique [Member] |  |
Valuation Technique | Income approach |
Range | 8.00% |
Income Approach Valuation Technique [Member] | Weighted Average [Member] |  |
Range | 8.00% |
Residential Portfolio Segment [Member] | Impaired Loans [Member] | Market Approach Valuation Technique [Member] |  |
Fair Value | $ 94 |
Valuation Technique | Sales approach |
Range | 10.00% |
Residential Portfolio Segment [Member] | Impaired Loans [Member] | Market Approach Valuation Technique [Member] | Weighted Average [Member] |  |
Range | 10.00% |
Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member] | Market Approach Valuation Technique [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Fair Value |  | $ 3,536
Valuation Technique |  | Sales approach
Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member] | Market Approach Valuation Technique [Member] | Commercial Real Estate Owner Occupied [Member] | Minimum [Member] |  |
Range |  | 0.00%
Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member] | Market Approach Valuation Technique [Member] | Commercial Real Estate Owner Occupied [Member] | Weighted Average [Member] |  |
Range |  | 13.70%
Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member] | Market Approach Valuation Technique [Member] | Commercial Real Estate Owner Occupied [Member] | Maximum [Member] |  |
Range |  | 65.00%
Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member] | Market Approach Valuation Technique [Member] | Commercial Real Estate Nonowner Occupied [Member] |  |
Fair Value | $ 2,602 | $ 1,985
Valuation Technique | Sales approach | Sales approach
Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member] | Market Approach Valuation Technique [Member] | Commercial Real Estate Nonowner Occupied [Member] | Minimum [Member] |  |
Range | 0.00% | 0.00%
Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member] | Market Approach Valuation Technique [Member] | Commercial Real Estate Nonowner Occupied [Member] | Weighted Average [Member] |  |
Range | 51.40% | 58.60%
Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member] | Market Approach Valuation Technique [Member] | Commercial Real Estate Nonowner Occupied [Member] | Maximum [Member] |  |
Range | 250.00% | 250.00%
Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member] | Market Approach Valuation Technique [Member] | Construction Loans [Member] |  |
Fair Value | $ 754 |
Valuation Technique | Sales approach |
Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member] | Market Approach Valuation Technique [Member] | Construction Loans [Member] | Minimum [Member] |  |
Range | 0.00% |
Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member] | Market Approach Valuation Technique [Member] | Construction Loans [Member] | Weighted Average [Member] |  |
Range | 11.70% |
Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member] | Market Approach Valuation Technique [Member] | Construction Loans [Member] | Maximum [Member] |  |
Range | 30.00% |
Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member] | Cost Approach Valuation Technique [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Valuation Technique |  | Cost approach
Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member] | Cost Approach Valuation Technique [Member] | Commercial Real Estate Owner Occupied [Member] | Minimum [Member] |  |
Range |  | 0.00%
Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member] | Cost Approach Valuation Technique [Member] | Commercial Real Estate Owner Occupied [Member] | Weighted Average [Member] |  |
Range |  | 14.80%
Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member] | Cost Approach Valuation Technique [Member] | Commercial Real Estate Owner Occupied [Member] | Maximum [Member] |  |
Range |  | 29.50%
Commercial Real Estate Portfolio Segment [Member] | Other Real Estate Owned [Member] | Market Approach Valuation Technique [Member] | Construction Loans [Member] |  |
Fair Value |  | $ 754
Valuation Technique |  | Sales approach
Commercial Real Estate Portfolio Segment [Member] | Other Real Estate Owned [Member] | Market Approach Valuation Technique [Member] | Construction Loans [Member] | Minimum [Member] |  |
Range |  | 0.00%
Commercial Real Estate Portfolio Segment [Member] | Other Real Estate Owned [Member] | Market Approach Valuation Technique [Member] | Construction Loans [Member] | Weighted Average [Member] |  |
Range |  | 11.70%
Commercial Real Estate Portfolio Segment [Member] | Other Real Estate Owned [Member] | Market Approach Valuation Technique [Member] | Construction Loans [Member] | Maximum [Member] |  |
Range |  | 30.00%
Commercial and Industrial Portfolio Segment [Member] | Impaired Loans [Member] | Market Approach Valuation Technique [Member] |  |
Fair Value |  | $ 298
Valuation Technique |  | Sales approach
Commercial and Industrial Portfolio Segment [Member] | Impaired Loans [Member] | Market Approach Valuation Technique [Member] | Minimum [Member] |  |
Range |  | 0.90%
Commercial and Industrial Portfolio Segment [Member] | Impaired Loans [Member] | Market Approach Valuation Technique [Member] | Weighted Average [Member] |  |
Range |  | 5.20%
Commercial and Industrial Portfolio Segment [Member] | Impaired Loans [Member] | Market Approach Valuation Technique [Member] | Maximum [Member] |  |
Range |  | 9.70%

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