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Premises and Equipment - Major Categories of Banking Premises and Equipment and Accumulated Depreciation (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross) $ 38,368us-gaap_PropertyPlantAndEquipmentGross $ 35,988us-gaap_PropertyPlantAndEquipmentGross
Less: Accumulated depreciation (18,068)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (17,279)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Premises and Equipment (Net) 20,300us-gaap_PropertyPlantAndEquipmentNet 18,709us-gaap_PropertyPlantAndEquipmentNet
Land [Member]    
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross) 4,984us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
4,360us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross) 21,955us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
20,593us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
Furnishings [Member]    
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross) $ 11,429us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
$ 11,035us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember