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Note 15 - Fair Value Measurements and Fair Values of Financial Instruments - Quantitative Information about Level 3 Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Income Approach Valuation Technique [Member] | Corporate Debt Securities [Member]    
Fair Value $ 2,971 $ 2,834
Valuation Technique Discounted Cash Flows Discounted Cash Flows
Unobservable Input Discount Rate Discount Rate
Income Approach Valuation Technique [Member] | Corporate Debt Securities [Member] | Weighted Average [Member]    
Discount Rate 4.68% 4.11%
Income Approach Valuation Technique [Member] | Collateralized Debt Obligations [Member]    
Fair Value $ 1,820 $ 1,883
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 9.08% 7.77%
Income Approach Valuation Technique [Member] | Collateralized Debt Obligations [Member] | Minimum [Member]    
Discount Rate 8.85% 7.31%
Income Approach Valuation Technique [Member] | Collateralized Debt Obligations [Member] | Maximum [Member]    
Discount Rate 9.35% 7.81%
Income Approach Valuation Technique [Member] | SBA Servicing Assets [Member]    
Fair Value $ 5,352 $ 4,886
Valuation Technique Discounted Cash Flows Discounted Cash Flows
Unobservable Input Conditional Prepayment Rate Conditional Prepayment Rate
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 6.12% 6.27%
Market Approach Valuation Technique [Member] | Impaired Loans [Member]    
Fair Value $ 9,110 $ 5,734
Valuation Technique [1] Appraised Value of Collateral (1) Appraised Value of Collateral (1)
Unobservable Input [2] Liquidation expenses (2) Liquidation expenses (2)
Market Approach Valuation Technique [Member] | Impaired Loans [Member] | Weighted Average [Member]    
Liquidation expenses [3] 11.00% 20.00%
Market Approach Valuation Technique [Member] | Impaired Loans [Member] | Minimum [Member]    
Liquidation expenses [3] 7.00% 12.00%
Market Approach Valuation Technique [Member] | Impaired Loans [Member] | Maximum [Member]    
Liquidation expenses [3] 20.00% 78.00%
Market Approach Valuation Technique [Member] | Other Real Estate Owned [Member]    
Fair Value $ 8,563 $ 10,034
Valuation Technique [1] Appraised Value of Collateral (1) Appraised Value of Collateral (1)
Unobservable Input [2] Liquidation expenses (2) Liquidation expenses (2)
Unobservable Input   Appraisal adjustment (2)
Market Approach Valuation Technique [Member] | Other Real Estate Owned [Member] | Weighted Average [Member]    
Liquidation expenses [3] 17.00% 10.00%
Appraisal adjustment [3]   50.00%
Market Approach Valuation Technique [Member] | Other Real Estate Owned [Member] | Minimum [Member]    
Liquidation expenses [3] 5.00% 6.00%
Market Approach Valuation Technique [Member] | Other Real Estate Owned [Member] | Maximum [Member]    
Liquidation expenses [3] 76.00% 30.00%
Sales Price Valuation Technique [Member] | Impaired Loans [Member]    
Valuation Technique Sales Price  
Unobservable Input [2] Liquidation expenses(2)  
Sales Price Valuation Technique [Member] | Impaired Loans [Member] | Maximum [Member]    
Liquidation expenses [3] 7.00%  
Sales Price Valuation Technique [Member] | Other Real Estate Owned [Member]    
Valuation Technique Sales Price Sales Price
Unobservable Input [2]   Liquidation expenses (2)
Unobservable Input [2] Liquidation expenses (2)  
Sales Price Valuation Technique [Member] | Other Real Estate Owned [Member] | Weighted Average [Member]    
Liquidation expenses [3] 7.00% 9.00%
Sales Price Valuation Technique [Member] | Other Real Estate Owned [Member] | Minimum [Member]    
Liquidation expenses [3] 7.00% 7.00%
Sales Price Valuation Technique [Member] | Other Real Estate Owned [Member] | Maximum [Member]    
Liquidation expenses [3] 8.00% 9.00%
[1] Fair value is generally determined through independent appraisals of the underlying collateral, which include Level 3 inputs that are not identifiable.
[2] Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses.
[3] 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.