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PREMISES AND EQUIPMENT, NET (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
PREMISES AND EQUIPMENT, NET      
Premises and equipment, gross $ 230,716us-gaap_PropertyPlantAndEquipmentGross   $ 223,131us-gaap_PropertyPlantAndEquipmentGross
Less: accumulated depreciation and amortization (104,195)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment   (95,372)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Total 126,521us-gaap_PropertyPlantAndEquipmentNet   127,759us-gaap_PropertyPlantAndEquipmentNet
Depreciation and amortization expense, inclusive of capital leases 8,826us-gaap_DepreciationAndAmortization 6,246us-gaap_DepreciationAndAmortization  
Computer hardware and software      
PREMISES AND EQUIPMENT, NET      
Premises and equipment, gross 151,262us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember
  140,799us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember
Office equipment and other      
PREMISES AND EQUIPMENT, NET      
Premises and equipment, gross 33,578us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember
  36,032us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember
Furniture and fixtures      
PREMISES AND EQUIPMENT, NET      
Premises and equipment, gross 12,880us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
  12,231us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
Leasehold improvements      
PREMISES AND EQUIPMENT, NET      
Premises and equipment, gross $ 32,996us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
  $ 34,069us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember