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Note 7 - Fair Value of Financial Instruments - Quantitative Information about Level 3 Assets (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Income Approach Valuation Technique [Member] | Corporate Debt Securities [Member] | Weighted Average [Member]    
Discount Rate 4.35% 4.11%
Income Approach Valuation Technique [Member] | Corporate Debt Securities [Member]    
Fair Value $ 2,933 $ 2,834
Valuation Technique Discounted Cash Flows Discounted Cash Flows
Unobservable Input Discount Rate Discount Rate
Income Approach Valuation Technique [Member] | Collateralized Debt Obligations [Member] | Weighted Average [Member]    
Discount Rate 8.68% 7.77%
Income Approach Valuation Technique [Member] | Collateralized Debt Obligations [Member] | Minimum [Member]    
Discount Rate 8.45% 7.31%
Income Approach Valuation Technique [Member] | Collateralized Debt Obligations [Member] | Maximum [Member]    
Discount Rate 8.95% 7.81%
Income Approach Valuation Technique [Member] | Collateralized Debt Obligations [Member]    
Fair Value $ 1,691 $ 1,883
Valuation Technique Discounted Cash Flows Discounted Cash Flows
Unobservable Input Discount Rate Discount Rate
Income Approach Valuation Technique [Member] | SBA Servicing Assets [Member] | Weighted Average [Member]    
Discount Rate 10.00% 10.00%
Conditional prepayment rate 6.16% 6.27%
Income Approach Valuation Technique [Member] | SBA Servicing Assets [Member]    
Fair Value $ 5,297 $ 4,886
Valuation Technique Discounted Cash Flows Discounted Cash Flows
Unobservable Input Discount Rate Discount Rate
Unobservable Input Conditional Prepayment Rate Conditional Prepayment Rate
Income Approach Valuation Technique [Member] | Impaired Loans [Member] | Weighted Average [Member]    
Liquidation expenses [1] 15.00%  
Income Approach Valuation Technique [Member] | Impaired Loans [Member] | Minimum [Member]    
Liquidation expenses [1] 4.00%  
Income Approach Valuation Technique [Member] | Impaired Loans [Member] | Maximum [Member]    
Liquidation expenses [1] 76.00%  
Income Approach Valuation Technique [Member] | Impaired Loans [Member]    
Unobservable Input [2] Liquidation expenses  
Market Approach Valuation Technique [Member] | Impaired Loans [Member] | Weighted Average [Member]    
Liquidation expenses [1]   20.00%
Appraisal adjustment [1] 0.00%  
Market Approach Valuation Technique [Member] | Impaired Loans [Member] | Minimum [Member]    
Liquidation expenses [1]   12.00%
Market Approach Valuation Technique [Member] | Impaired Loans [Member] | Maximum [Member]    
Liquidation expenses [1]   78.00%
Market Approach Valuation Technique [Member] | Impaired Loans [Member]    
Fair Value $ 9,331 $ 5,734
Valuation Technique [3] Appraised Value of Collateral Appraised Value of Collateral
Unobservable Input [2] Appraisal adjustment Liquidation expenses
Market Approach Valuation Technique [Member] | Other Real Estate Owned [Member] | Weighted Average [Member]    
Liquidation expenses [1] 12.00% 10.00%
Appraisal adjustment 0.00% 50.00%
Market Approach Valuation Technique [Member] | Other Real Estate Owned [Member] | Minimum [Member]    
Liquidation expenses [1] 7.00% 6.00%
Market Approach Valuation Technique [Member] | Other Real Estate Owned [Member] | Maximum [Member]    
Liquidation expenses [1] 27.00% 30.00%
Market Approach Valuation Technique [Member] | Other Real Estate Owned [Member]    
Valuation Technique [3] Appraised Value of Collateral Appraised Value of Collateral
Unobservable Input [2] Appraisal adjustment Appraisal adjustment
Unobservable Input [2] Liquidation expenses Liquidation expenses
Sales Price Valuation Technique [Member] | Other Real Estate Owned [Member] | Weighted Average [Member]    
Liquidation expenses [1] 7.00% 9.00%
Sales Price Valuation Technique [Member] | Other Real Estate Owned [Member] | Minimum [Member]    
Liquidation expenses [1]   7.00%
Sales Price Valuation Technique [Member] | Other Real Estate Owned [Member] | Maximum [Member]    
Liquidation expenses [1]   9.00%
Sales Price Valuation Technique [Member] | Other Real Estate Owned [Member]    
Fair Value $ 8,593 $ 10,034
Valuation Technique Sales Price Sales Price
Unobservable Input [2] Liquidation expenses Liquidation expenses
[1] The range and weighted average of qualitative factors such as economic conditions and estimated liquidation expenses are presented as a percent of the appraised value.
[2] Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses.
[3] Fair value is generally determined through independent appraisals of the underlying collateral, which include Level 3 inputs that are not identifiable.