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Note 7 - Fair Value of Financial Instruments - Quantitative Information about Level 3 Assets (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Income Approach Valuation Technique [Member] | Corporate Debt Securities [Member] | Weighted Average [Member]    
Discount Rate 4.19% 4.11%
Income Approach Valuation Technique [Member] | Corporate Debt Securities [Member]    
Fair value $ 2,870 $ 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 8.10% 7.77%
Income Approach Valuation Technique [Member] | Collateralized Debt Obligations [Member] | Minimum [Member]    
Discount Rate 7.87% 7.31%
Income Approach Valuation Technique [Member] | Collateralized Debt Obligations [Member] | Maximum [Member]    
Discount Rate 8.37% 7.81%
Income Approach Valuation Technique [Member] | Collateralized Debt Obligations [Member]    
Fair value $ 1,755 $ 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 6.35% 6.27%
Income Approach Valuation Technique [Member] | SBA Servicing Assets [Member]    
Fair value $ 5,118 $ 4,886
Valuation technique Discounted Cash Flows Discounted Cash Flows
Unobservable input Discount Rate Discount Rate
Unobservable input Conditional Prepayment Rate Conditional Prepayment Rate
Market Approach Valuation Technique [Member] | Impaired Loans [Member] | Weighted Average [Member]    
Liquidation expenses [1] 12.00% 20.00%
Appraisal adjustment [1] 0.00%  
Market Approach Valuation Technique [Member] | Impaired Loans [Member] | Minimum [Member]    
Liquidation expenses [1] 7.00% 12.00%
Market Approach Valuation Technique [Member] | Impaired Loans [Member] | Maximum [Member]    
Liquidation expenses [1] 24.00% 78.00%
Market Approach Valuation Technique [Member] | Impaired Loans [Member]    
Fair value $ 9,024 $ 5,734
Valuation technique [2] Appraised Value of Collateral (1) Appraised Value of Collateral (1)
Unobservable input [3] Liquidation expenses (2) Liquidation expenses (2)
Unobservable input [3] Appraisal adjustment (2)  
Market Approach Valuation Technique [Member] | Other Real Estate Owned [Member] | Weighted Average [Member]    
Liquidation expenses [1] 6.00% 10.00%
Appraisal adjustment 0.00% 50.00%
Market Approach Valuation Technique [Member] | Other Real Estate Owned [Member] | Minimum [Member]    
Liquidation expenses [1] 4.00% 6.00%
Market Approach Valuation Technique [Member] | Other Real Estate Owned [Member] | Maximum [Member]    
Liquidation expenses [1] 19.00% 30.00%
Market Approach Valuation Technique [Member] | Other Real Estate Owned [Member]    
Fair value $ 8,807 $ 10,034
Valuation technique [2] Appraised Value of Collateral (1) Appraised Value of Collateral (1)
Unobservable input [3] Liquidation expenses (2) Liquidation expenses (2)
Unobservable input [3] Appraisal adjustment (2) Appraisal adjustment (2)
Sales Price Valuation Technique [Member] | Other Real Estate Owned [Member] | Weighted Average [Member]    
Liquidation expenses [1] 6.00% 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]    
Valuation technique   Sales Price
Unobservable input [3] Liquidation expenses (2) Liquidation expenses (2)
[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] Fair value is generally determined through independent appraisals of the underlying collateral, which include Level 3 inputs that are not identifiable.
[3] Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses.