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Premises and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2014
Property Plant And Equipment Line Items    
Property Plant And Equipment Gross 129,384us-gaap_PropertyPlantAndEquipmentGross $ 133,271us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation and amortization (46,481)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (52,672)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Total Premises and Equipment, net 82,903us-gaap_PropertyPlantAndEquipmentNet 80,599us-gaap_PropertyPlantAndEquipmentNet
Land And Land Improvements    
Property Plant And Equipment Line Items    
Property Plant And Equipment Gross 5,680us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandImprovementsMember
5,680us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandImprovementsMember
Building And Building Improvements    
Property Plant And Equipment Line Items    
Property Plant And Equipment Gross 63,594us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
65,430us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
Building And Building Improvements | Minimum [Member]    
Property Plant And Equipment Line Items    
Property Plant And Equipment Useful Life 0 years  
Building And Building Improvements | Maximum [Member]    
Property Plant And Equipment Line Items    
Property Plant And Equipment Useful Life 40 years  
Leasehold Improvements    
Property Plant And Equipment Line Items    
Property Plant And Equipment Gross 23,031us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
23,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
Leasehold Improvements | Minimum [Member]    
Property Plant And Equipment Line Items    
Property Plant And Equipment Useful Life 5 years  
Leasehold Improvements | Maximum [Member]    
Property Plant And Equipment Line Items    
Property Plant And Equipment Useful Life 10 years  
Furniture And Fixtures    
Property Plant And Equipment Line Items    
Property Plant And Equipment Gross 12,203us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
12,739us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
Furniture And Fixtures | Minimum [Member]    
Property Plant And Equipment Line Items    
Property Plant And Equipment Useful Life 3 years  
Furniture And Fixtures | Maximum [Member]    
Property Plant And Equipment Line Items    
Property Plant And Equipment Useful Life 7 years  
Software And Software Development Costs    
Property Plant And Equipment Line Items    
Property Plant And Equipment Gross 24,876us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareAndSoftwareDevelopmentCostsMember
$ 26,422us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareAndSoftwareDevelopmentCostsMember
Software And Software Development Costs | Minimum [Member]    
Property Plant And Equipment Line Items    
Property Plant And Equipment Useful Life 3 years  
Software And Software Development Costs | Maximum [Member]    
Property Plant And Equipment Line Items    
Property Plant And Equipment Useful Life 7 years