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Note 17 - Fair Value - Quantitative Information for Assets Measured at Fair Value on Nonrecurring Basis (Details) - Fair Value, Nonrecurring [Member] - Measurement Input, Discount Rate [Member] - Valuation, Market Approach [Member]
Dec. 31, 2019
Dec. 31, 2018
Minimum [Member]    
Discount range, impaired loans [1],[2] 0.22 0.15
Discount range, non-covered OREO [1],[2] 0.15 0.01
Discount range, covered OREO [1],[2] 0.49
Maximum [Member]    
Discount range, impaired loans [1],[2] 0.36 1
Discount range, non-covered OREO [1],[2] 1 0.81
Discount range, covered OREO [1],[2] 0.49
Weighted Average [Member]    
Discount range, impaired loans [1],[2] (0.26) (0.29)
Discount range, non-covered OREO [1],[2] (0.08) (0.31)
Discount range, covered OREO [1],[2] (0.49)
[1] Appraisals may be adjusted by management for customized discounting criteria, estimated sales costs, and proprietary qualitative adjustments.
[2] Fair value is generally based on appraisals of the underlying collateral.