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Note 12 - Fair Value - Quantitative Information for Assets Measured at Fair Value on Nonrecurring Basis (Details) - Fair Value, Measurements, Nonrecurring [Member]
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Impaired Loans [Member] | Non-covered Loans [Member]    
Valuation technique [1] Discounted appraisals(1)  
Unobservable input [2] Appraisal adjustments(2)  
Impaired Loans [Member] | Non-covered Loans [Member] | Minimum [Member]    
Discount range 2.00% 3.00%
Impaired Loans [Member] | Non-covered Loans [Member] | Maximum [Member]    
Discount range 63.00% 39.00%
Impaired Loans [Member] | Non-covered Loans [Member] | Weighted Average [Member]    
Discount range 18.00% 17.00%
OREO [Member] | Non-covered Loans [Member]    
Valuation technique [1] Discounted appraisals(1)  
Unobservable input [2] Appraisal adjustments(2)  
OREO [Member] | Non-covered Loans [Member] | Minimum [Member]    
Discount range 10.00% 0.00%
OREO [Member] | Non-covered Loans [Member] | Maximum [Member]    
Discount range 62.00% 88.00%
OREO [Member] | Non-covered Loans [Member] | Weighted Average [Member]    
Discount range 28.00% 30.00%
OREO [Member] | Covered Loans [Member]    
Valuation technique [1] Discounted appraisals(1)  
Unobservable input [2] Appraisal adjustments(2)  
OREO [Member] | Covered Loans [Member] | Minimum [Member]    
Discount range 0.00% 0.00%
OREO [Member] | Covered Loans [Member] | Maximum [Member]    
Discount range 65.00% 44.00%
OREO [Member] | Covered Loans [Member] | Weighted Average [Member]    
Discount range 56.00% 40.00%
[1] Fair value is generally based on appraisals of the underlying collateral.
[2] Appraisals may be adjusted by management for customized discounting criteria, estimated sales costs, and proprietary qualitative adjustments.