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Components of Premises and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Land	$ 19,166us-gaap_Land	$ 19,884us-gaap_Land
Buildings and leasehold improvements	50,729us-gaap_BuildingsAndImprovementsGross	54,292us-gaap_BuildingsAndImprovementsGross
Equipment	38,103us-gaap_FixturesAndEquipmentGross	36,983us-gaap_FixturesAndEquipmentGross
Property, Plant and Equipment, Gross, Total	107,998us-gaap_PropertyPlantAndEquipmentGross	111,159us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation and amortization	52,154us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	50,043us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Total premises and equipment, net	$ 55,844us-gaap_PropertyPlantAndEquipmentNet	$ 61,116us-gaap_PropertyPlantAndEquipmentNet

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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-Publisher FASB

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X

- Definition

Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.

+ References

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- Definition

Amount before accumulated depreciation of fixtures and equipment. Includes, but is not limited to, machinery, equipment, and engines.

+ References

No definition available.

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- Definition

Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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+ References

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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