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Note 4 - Premises and Equipment, Net (Details) - Summary of Premises and Equipment - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Premises and equipment $ 72,621,000 $ 72,901,000
Less: accumulated depreciation 26,658,000 26,039,000
Premises and equipment, net 45,963,000 46,862,000
Land and Land Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment 16,438,000 16,529,000
Building [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment 39,223,000 39,394,000
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment $ 16,960,000 $ 16,978,000