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Premises and Equipment - Schedule of Property and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]      
Total Premises and Equipment $ 55,812us-gaap_PropertyPlantAndEquipmentGross $ 47,055us-gaap_PropertyPlantAndEquipmentGross  
Accumulated depreciation and amortization (20,169)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (18,731)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment  
Total Premises and Equipment, Net 35,643us-gaap_PropertyPlantAndEquipmentNet 28,324us-gaap_PropertyPlantAndEquipmentNet  
Depreciation expense and amortization of leasehold improvements 1,865us-gaap_DepreciationAndAmortization 1,793us-gaap_DepreciationAndAmortization 1,674us-gaap_DepreciationAndAmortization
Land      
Property, Plant and Equipment [Line Items]      
Total Premises and Equipment 2,600us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
3,201us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
 
Furniture And Equipment      
Property, Plant and Equipment [Line Items]      
Total Premises and Equipment 11,363us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
9,988us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
 
Tenant Improvements      
Property, Plant and Equipment [Line Items]      
Total Premises and Equipment 8,019us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
6,776us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
 
Buildings      
Property, Plant and Equipment [Line Items]      
Premises and equipment, useful Life 39 years 39 years  
Total Premises and Equipment $ 33,830us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
$ 27,090us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
 
Minimum | Furniture And Equipment      
Property, Plant and Equipment [Line Items]      
Premises and equipment, useful Life 3 years 3 years  
Minimum | Tenant Improvements      
Property, Plant and Equipment [Line Items]      
Premises and equipment, useful Life 2 years 2 years  
Maximum | Furniture And Equipment      
Property, Plant and Equipment [Line Items]      
Premises and equipment, useful Life 7 years 7 years  
Maximum | Tenant Improvements      
Property, Plant and Equipment [Line Items]      
Premises and equipment, useful Life 15 years 15 years