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Premises and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment    
Premises and equipment, gross $ 324,907us-gaap_PropertyPlantAndEquipmentGross $ 303,401us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation (129,695)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (123,711)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Premises and equipment, net 195,212us-gaap_PropertyPlantAndEquipmentNet 179,690us-gaap_PropertyPlantAndEquipmentNet
Land    
Property, Plant and Equipment    
Premises and equipment, gross 40,620us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember		 37,581us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
Buildings and improvements    
Property, Plant and Equipment    
Premises and equipment, gross 209,328us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember		 196,950us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
Furniture and equipment    
Property, Plant and Equipment    
Premises and equipment, gross $ 74,959us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember		 $ 68,870us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember