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Note 18 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Impaired loans [1] $ 9,896,000 $ 8,970,000
Foreclosed assets [1] 469,000 1,293,000
Total 10,365,000 10,263,000
Fair Value, Inputs, Level 1 [Member]    
Impaired loans [1] 0 0
Foreclosed assets [1] 0 0
Total 0 0
Fair Value, Inputs, Level 2 [Member]    
Impaired loans [1] 0 0
Foreclosed assets [1] 0 0
Total 0 0
Fair Value, Inputs, Level 3 [Member]    
Impaired loans [1] 9,896,000 8,970,000
Foreclosed assets [1] 469,000 1,293,000
Total $ 10,365,000 $ 10,263,000
[1] Represents carrying value and related write-downs for which adjustments are based on the estimated value of the property or other assets.