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Note 16 - 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, 2021
Dec. 31, 2020
Minimum [Member]    
Collateral dependent assets with specific reserves [1],[2] 0  
OREO [1],[2] 0 0.08
Impaired loans [1],[2]   0.22
Maximum [Member]    
Collateral dependent assets with specific reserves [1],[2] 0.11  
OREO [1],[2] 0.87 0.77
Impaired loans [1],[2]   0.38
Weighted Average [Member]    
Collateral dependent assets with specific reserves [1],[2] (0.06)  
OREO [1],[2] (0.32) (0.25)
Impaired loans [1],[2]   (0.30)
[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.