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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
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Dec. 31, 2014 Contract | Dec. 31, 2013 Contract | Dec. 31, 2012 Contract
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | 3 us-gaap_FinancingReceivableModificationsNumberOfContracts2 | 0 us-gaap_FinancingReceivableModificationsNumberOfContracts2 | 0 us-gaap_FinancingReceivableModificationsNumberOfContracts2
Pre-Modification Outstanding Recorded Investment | $ 4,887 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 |  |
Post-Modification Outstanding Recorded Investment | 2,979 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 |  |
Recorded Investment | 2,933 us-gaap_FinancingReceivableModificationsRecordedInvestment |  |
Residential Mortgage [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | 2 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancialInstrumentAxis = us-gaap_ResidentialMortgageMember |  |
Pre-Modification Outstanding Recorded Investment | 479 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancialInstrumentAxis = us-gaap_ResidentialMortgageMember |  |
Post-Modification Outstanding Recorded Investment | 479 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancialInstrumentAxis = us-gaap_ResidentialMortgageMember |  |
Recorded Investment | 476 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancialInstrumentAxis = us-gaap_ResidentialMortgageMember |  |
Commercial Real Estate [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Contracts | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CommercialRealEstateMember |  |
Pre-Modification Outstanding Recorded Investment | 4,408 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CommercialRealEstateMember |  |
Post-Modification Outstanding Recorded Investment | 2,500 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CommercialRealEstateMember |  |
Recorded Investment | $ 2,457 us-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 + Details
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- Definition 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 + Details
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- Definition 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 + Details
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- Definition 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 + Details
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