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Loans, Net And Allowance For Loan Losses - Summary of Loans Terms Modified Resulting in Troubled Debt Restructurings (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 Contract	Dec. 31, 2013 Contract	Dec. 31, 2012 Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts	3us-gaap_FinancingReceivableModificationsNumberOfContracts2	0us-gaap_FinancingReceivableModificationsNumberOfContracts2	0us-gaap_FinancingReceivableModificationsNumberOfContracts2
Pre-Modification Outstanding Recorded Investment	$ 4,887us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Post-Modification Outstanding Recorded Investment	2,979us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Recorded Investment	2,933us-gaap_FinancingReceivableModificationsRecordedInvestment
Residential Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	2us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancialInstrumentAxis = us-gaap_ResidentialMortgageMember
Pre-Modification Outstanding Recorded Investment	479us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancialInstrumentAxis = us-gaap_ResidentialMortgageMember
Post-Modification Outstanding Recorded Investment	479us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancialInstrumentAxis = us-gaap_ResidentialMortgageMember
Recorded Investment	476us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = us-gaap_ResidentialMortgageMember
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CommercialRealEstateMember
Pre-Modification Outstanding Recorded Investment	4,408us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CommercialRealEstateMember
Post-Modification Outstanding Recorded Investment	2,500us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CommercialRealEstateMember
Recorded Investment	$ 2,457us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CommercialRealEstateMember

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- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524

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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524

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Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524

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The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 40

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554

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