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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]
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Impaired Loans [Member] | Non-covered Loans [Member]    
Valuation Technique [1] Discounted appraisals  
Unobservable Input [2] Appraisal adjustments  
Impaired Loans [Member] | Non-covered Loans [Member] | Minimum [Member]    
Discount Range 1.00% 3.00%
Impaired Loans [Member] | Non-covered Loans [Member] | Maximum [Member]    
Discount Range 39.00% 39.00%
Impaired Loans [Member] | Non-covered Loans [Member] | Weighted Average [Member]    
Discount Range 11.00% 17.00%
OREO [Member] | Non-covered Loans [Member]    
Valuation Technique [1] Discounted appraisals  
Unobservable Input [2] Appraisal adjustments  
OREO [Member] | Non-covered Loans [Member] | Minimum [Member]    
Discount Range 10.00% 0.00%
OREO [Member] | Non-covered Loans [Member] | Maximum [Member]    
Discount Range 43.00% 88.00%
OREO [Member] | Non-covered Loans [Member] | Weighted Average [Member]    
Discount Range 35.00% 30.00%
OREO [Member] | Covered Loans [Member]    
Valuation Technique [1] Discounted appraisals  
Unobservable Input [2] Appraisal adjustments  
Discount Range 0.00%  
OREO [Member] | Covered Loans [Member] | Minimum [Member]    
Discount Range   0.00%
OREO [Member] | Covered Loans [Member] | Maximum [Member]    
Discount Range   44.00%
OREO [Member] | Covered Loans [Member] | Weighted Average [Member]    
Discount Range   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.