Premises and Equipment Premises and Equipment (Details) (USD $)
|
12 Months Ended |
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Premises and Equipment [Line Items] |
|
|
|
Premises and Equipment, Gross |
$ 617,707,000us-gaap_PropertyPlantAndEquipmentGross |
$ 594,698,000us-gaap_PropertyPlantAndEquipmentGross |
|
Premises and Equipment, Accumulated depreciation |
343,874,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment |
316,849,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment |
|
Premises and Equipment, net |
273,833,000us-gaap_PropertyPlantAndEquipmentNet |
277,849,000us-gaap_PropertyPlantAndEquipmentNet |
|
Depreciation Expense |
33,000,000us-gaap_Depreciation |
30,000,000us-gaap_Depreciation |
33,000,000us-gaap_Depreciation |
Land [Member] |
|
|
|
Premises and Equipment [Line Items] |
|
|
|
Premises and Equipment, Gross |
71,371,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember |
75,859,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember |
|
Building and improvements [Member] |
|
|
|
Premises and Equipment [Line Items] |
|
|
|
Premises and Equipment, Gross |
225,008,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingAndBuildingImprovementsMember |
221,326,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingAndBuildingImprovementsMember |
|
Software [Member] |
|
|
|
Premises and Equipment [Line Items] |
|
|
|
Premises and Equipment, Gross |
120,010,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerSoftwareIntangibleAssetMember |
103,473,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerSoftwareIntangibleAssetMember |
|
Furniture and equipment [Member] |
|
|
|
Premises and Equipment [Line Items] |
|
|
|
Premises and Equipment, Gross |
179,513,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember |
163,013,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember |
|
Construction in progress [Member] |
|
|
|
Premises and Equipment [Line Items] |
|
|
|
Premises and Equipment, Gross |
$ 21,805,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_AssetUnderConstructionMember |
$ 31,027,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_AssetUnderConstructionMember |
|