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Note 5 - Premises and Equipment, Net (Details) - Summary of Premises and Equipment (USD $)
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Premises and equipment $ 71,962,000us-gaap_PropertyPlantAndEquipmentGross $ 46,007,000us-gaap_PropertyPlantAndEquipmentGross
Less: accumulated depreciation 23,150,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 21,109,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Total premises and equipment 48,812,000us-gaap_PropertyPlantAndEquipmentNet 24,898,000us-gaap_PropertyPlantAndEquipmentNet
Land and Land Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment 16,579,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandAndLandImprovementsMember		 8,556,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandAndLandImprovementsMember
Building [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment 38,761,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		 24,733,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment $ 16,622,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember		 $ 12,718,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember