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Premises and Equipment (Schedule of Premises and Equipment) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Premises and equipment, gross $ 125,787us-gaap_PropertyPlantAndEquipmentGross $ 125,574us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation and amortization (50,674)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (48,126)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Net book value of premises and equipment 75,113us-gaap_PropertyPlantAndEquipmentNet 77,448us-gaap_PropertyPlantAndEquipmentNet
Land [Member]    
Premises and equipment, gross 23,911us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
23,893us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
Buildings [Member]    
Premises and equipment, gross 65,130us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
64,518us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
Furniture and Equipment [Member]    
Premises and equipment, gross 35,423us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
35,281us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
Leasehold Improvements [Member]    
Premises and equipment, gross $ 1,323us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdsAndLeaseholdImprovementsMember
$ 1,882us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdsAndLeaseholdImprovementsMember