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Premises and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
PREMISES AND EQUIPMENT      
Premises and equipment, gross $ 37,603us-gaap_PropertyPlantAndEquipmentGross   $ 37,558us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation (12,786)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment   (12,358)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Total 24,817us-gaap_PropertyPlantAndEquipmentNet   25,200us-gaap_PropertyPlantAndEquipmentNet
Depreciation      
Depreciation 426us-gaap_DepreciationNonproduction 336us-gaap_DepreciationNonproduction  
Land [Member]      
PREMISES AND EQUIPMENT      
Premises and equipment, gross 7,652us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
  7,652us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
Building and Building Improvements [Member]      
PREMISES AND EQUIPMENT      
Premises and equipment, gross 21,827us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
  21,831us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
Furniture fixtures and equipment [Member]      
PREMISES AND EQUIPMENT      
Premises and equipment, gross $ 8,124us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= gnbc_FurnitureFixturesAndEquipmentMember
  $ 8,075us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= gnbc_FurnitureFixturesAndEquipmentMember