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Note 18 - Fair Value and Interest Rate Risk - Quantitative Information About Level 3 Fair Value Measurements (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Other real estate owned, fair value $ 851  
Impaired loans, fair value   $ 363
Fair Value, Inputs, Level 3 [Member]    
Other real estate owned, fair value 851  
Impaired loans, fair value   363
Fair Value, Inputs, Level 3 [Member] | Fair Value of Collateral Approach [Member]    
Other real estate owned, fair value [1],[2] $ 851  
Impaired loans, fair value [1],[2]   $ 363
Fair Value, Inputs, Level 3 [Member] | Fair Value of Collateral Approach [Member] | Weighted Average [Member]    
Weighting of qualitative factors(3) [3] 22.60% 8.00%
[1] Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses.
[2] Fair value is generally determined through independent appraisals of the underlying property (in the case of OREO) or collateral (in the case of impaired loans).
[3] The weighting of qualitative factors includes items such as economic conditions (positive weight) and estimated liquidation expenses. Regarding OREO, the weighting of qualitative factors is further adjusted by a factor based on historical experience of appraised value to realized sales value, which at December 31, 2016 is a "haircut" to the weighting of 13%.